5G & Small Cell Infrastructure
H-O Products die-cuts and converts the material set inside and around 5G small cells: RF-transparent radome seals, EMI gaskets and soft conductive solid for compact radio housings, thermal interface pads and graphite for mmWave antenna modules, UV- and weather-exposed perimeter foams, vibration pads for strand and pole mounts, and the kiss-cut multi-part install kits that put all of it in a tower crew's hands as one labeled set, built to your drawing.
Built for: pole-, strand-, wall-, and rooftop-mounted small cells and mmWave radios; integrated antenna-radio modules; compact street-furniture enclosures framed on GR-487 and IEC 60529 design practice (cited by designation; the evaluation belongs to the tested node); and the multi-material kits that make a 30-minute install possible.
To spec the material set for a 5G small cell, split the node into four zones. RF window: the radome perimeter takes non-conductive seals only, BISCO® HT-870 Soft silicone foam, BF-1000 Extra Soft for low-closure-force frames, or RE-series EPDM foam; conductive filler in the RF window attenuates the link, so the EMI gasket line stops where the antenna aperture begins.
Radio housing: nickel-graphite silicone lid and seam gaskets (MIL-DTL-83528 Type M class context, by designation), nickel-aluminum corrosion-resistant grades for coastal or roadside aluminum housings (ASTM B117 salt-fog data per TDS.
The remaining zones and duties are mapped in the When-to-spec list on this page. Values are per the TDS on file.
Equipment-level, by designation (the evaluation belongs to the tested radio, node, or enclosure): MIL-DTL-83528 / SAE-AMS-DTL-83528 (conductive-elastomer detail spec and QPL framework) · Telcordia GR-487 (electronic equipment cabinets, the outdoor-enclosure design context) · IEC 60529 (IP ingress-protection code) · CISPR 32 / FCC Part 15 Subpart B (emissions).
Material-level, per the vendor TDS: UL 94 (flammability classes on the rated grades) · ASTM D5470 (thermal impedance of TIMs) · ASTM D1056 (cellular rubber classes) · ASTM D395 (compression set) · ASTM B117 (salt-spray exposure practice) · ASTM D991 (volume resistivity of conductive elastomers).
- Radome / RF-window seal: BISCO® HT-870 / RE-series EPDM (non-conductive)
- Radio lid EMI gasket: nickel-graphite silicone / V-0 rated grades
- Coastal / roadside housings: nickel-aluminum grades (B117 per TDS)
- Low-closure-force lids: soft conductive solid silicone
- Fixed seams / ground bonds: conductive foil tapes
- PA / module heat spreading: eGRAF® HITHERM™ + SpreaderShield™
- Gap filling to the housing: Gap Pad® TGP series
- Insulating TIM duty: Protect® 1500FG / Sil-Pad® TSP
- Bracket vibration pads: PORON® 4701 series / ENSOLITE®
- Install kits: kiss-cut multi-part sets + kitting
Where are you in the spec process?
This page serves engineers who already know the material set their node needs and engineers still assembling it requirement by requirement. Pick the path that matches where you are; you don't have to read the rest.
Send a drawing, get a quote
A nickel-graphite lid gasket, a radome perimeter seal, a graphite TIM blank, a PORON® bracket pad, or the complete kiss-cut install kit on your drawing set.
Skip to the quote form →Build the node set requirement by requirement
Six selection factors (RF transparency, shield continuity, combined EMI + weather duty, the thermal path, vibration, kitting), an install-point selector, and eleven material families with TDS-cited methods and by-designation standards language.
Start with selection factors →
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1Send drawingUpload a DXF, STEP, or PDF, or describe the node, housing, or mount. A sample part works too.
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2Material reviewEngineering reviews the RF window, shield continuity, closure forces, exposure, and thermal path against the vendor TDSs, and frames the standards language correctly: material classes (UL 94) per TDS, equipment standards (GR-487, IEC 60529, CISPR 32 / FCC Part 15) by designation, evaluation with the tested node.
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3PrototypeSamples typically ship in 3–5 business days for common die-cut configurations on materials we keep on hand. Made-to-order; MOQ varies by material and part.
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4ProductionStandard production runs ship about 2 weeks after drawing approval, on flatbed die-cutting, CNC knife cutting for kiss-cut kit sets, and kitting for node-level install kits. Ongoing parts run with material traceability and lot-code TDS records.
Which part of the node are you building?
Application Zones
Four material problems define a small cell: the radome and RF window, where the seal has to be electrically invisible; the radio core, where housing seams turn into radiating slots at mmWave frequencies and a fanless housing has to move tens of watts of PA heat through its skin; the enclosure perimeter, an outdoor sealing problem with street-furniture aesthetics and GR-487-framed design practice behind it; and the mount, where pole sway and strand vibration meet clamp hardware, and where the whole material set ships as one kiss-cut install kit.
Click a tab to see the stack, the controlling properties, and the families H-O converts for that zone.
Radome & RF window: the seal the antenna has to see through
Every other gasket on this page is allowed to be conductive; the radome seal is not. A small cell's antenna radiates through a polymer radome, and the perimeter seal that keeps water out of that joint sits at the edge of the antenna's field of view.
Conductive filler in that seal — nickel-graphite, silver-filled, foil — attenuates or detunes the link, so the radome perimeter takes non-conductive, RF-transparent materials by designation: closed-cell silicone foam such as BISCO® HT-870 Soft (cellular methods per ASTM D1056 on the TDS, with flame-class data on the rated grades), BF-1000 Extra Soft where the radome frame is thin-walled plastic that cannot take closure force, and RE-series EPDM closed-cell foam where the joint wants an economical hydrocarbon-resistant seal with long UV and ozone exposure history per the vendor TDS.
Dielectric behavior matters as a selection axis: foam seals are mostly air, which keeps effective dielectric constant and loss low, but RF transparency at the operating band is a system-level property — it belongs to the tested radome assembly, and the antenna team's sign-off on gasket placement is part of the spec. H-O die-cuts radome perimeter frames, sealing washers for radome fasteners, and gasket-on-liner sets that drop into the channel without field trimming.
mmWave radio core: the shield-and-heat double duty
Two physics problems share one housing. First, the shield: at FR2 mmWave bands (roughly 24–48 GHz), the free-space wavelength at 28 GHz is about 10.7 mm, so seam gaps and fastener pitches that were electrically invisible on a 700 MHz macro radio become radiating slots on a small cell. Gasket continuity — unbroken conductive contact along every lid and cover seam — is the controlling requirement, which is why this page's parent is the EMI & EMC shielding application.
Nickel-graphite silicone (MIL-DTL-83528 Type M class context, by designation) carries the lid-perimeter duty; soft conductive solid silicone takes low-closure-force covers; conductive foil tape closes fixed seams and carries ground bonds — and as an adhesive joint its performance depends on substrate, surface energy, temperature, exposure, dwell, pressure, surface preparation, and joint geometry, validated in the application.
Second, the heat: a small cell is a sealed, fanless convection radiator, and the PA, FPGA, and antenna-module heat has to cross clamped interfaces to reach the finned skin.
Graphite (eGRAF® HITHERM™, thermal impedance per ASTM D5470 on the TDS) carries thin, repeatable die-to-housing paths; Gap Pad® TGP conformable fillers absorb the tolerance stack between board and casting; Protect® and Sil-Pad® classes step in where the interface must also insulate electrically.
Compact enclosure & weather sealing: GR-487 design practice at street-furniture scale
A small-cell enclosure is an outdoor telecom cabinet shrunk to a shoebox, and it inherits the same design practice: door and lid perimeter gaskets sized to real latch forces, cable-entry seals that survive re-entry, and ingress-protection framing per IEC 60529 with the IP result belonging to the tested enclosure, not to any gasket. What changes at small-cell scale is the budget for force and space.
Latches are small, walls are thin, and the same gasket often has to do double duty as EMI contact and weather seal — the laminated EMI-plus-seal constructions H-O builds pair a conductive layer with a closed-cell weather layer so neither job is compromised.
Where the housing is powder-coated or anodized aluminum on a coastal or salted-road route, galvanic pairing leads the selection: nickel-aluminum corrosion-resistant grades carry salt-fog exposure data per ASTM B117 on their TDSs, and the fluorosilicone version adds fuel and oil resistance for roadside and rooftop mechanical spaces.
For the purely environmental joints — shroud edges, base plates, pole-interface collars — UV- and ozone-exposed EPDM and silicone foams carry the duty, with compression classes per ASTM D1056 matched to the latch force. Materials may be suitable depending on exposure, closure force, and housing finish; final selection should be validated in the application.
Mounts, vibration & install kits: the parts the tower crew touches
Small cells live on moving structures. Streetlight and utility poles sway in wind, strand mounts ride a cable that vibrates with every gust and passing truck, and rooftop frames transmit HVAC vibration from below.
The mount interface is where that motion meets the radio, and the converter-side answer is an elastomer pad at every clamp: PORON® 4701-series microcellular urethane (compression-force-deflection per ASTM D3574-class methods on the TDS, with long-term compression-set resistance as the defining property) for bracket and clamp interfaces that must hold preload for years; ENSOLITE® vinyl nitrile and SBE-series closed-cell foams for pole-collar and wall-standoff pads at gentler loads; and firm grades such as PORON® 4701-50 where the pad also shims a casting against a curved pole.
The second job of this zone is logistics: a small-cell install happens on a lift, in traffic, on the installer's clock. H-O converts the node's whole soft-goods set — radome seal, lid gasket, TIM blanks, entry grommets, bracket pads — as kiss-cut multi-part kits on liner, parts arranged in install order and labeled per the drawing, kitted under assembly & kitting with lot-code TDS records per material.
One kit per node, one part number to order, nothing trimmed in the bucket truck.
Six decisions that drive your small-cell material spec
A small cell is a radio, an enclosure, and a mount sharing one casting, and each interface has one controlling property. Miss one and the failure is rarely immediate: a link budget erodes behind a conductive gasket that crept into the RF window, a seam leaks at a band nobody scanned, or a clamp pad relaxes and the node starts to hum.
Materials carry classes; nodes carry evaluations. UL 94 V-0 belongs to a material grade per its TDS. GR-487, IEC 60529 IP results, and CISPR 32 / FCC Part 15 emissions results belong to the tested enclosure or radio. Write material classes on the part callouts, cite equipment standards by designation, and don't let a drawing imply that a gasket is "IP66 rated" on its own: the gasket supports an enclosure evaluated to it.
Shield apertures scale with wavelength. A fastener pitch and gasket-gap budget carried over from a sub-6-GHz design hands a mmWave radio a row of radiating slots. The conductive-elastomer and sponge families on this page are the converter-side ingredients of seam continuity; the emissions result belongs to the tested radio, which is why this page cites CISPR 32 / FCC Part 15 by designation and the gasket drawing by part number.
Read the six factors below in order. The first two split the node into transparent and conductive territory; the middle two carry the weather and the heat; the last two steady the mount and stage the install. Every factor names its test method, because on a node that gets evaluated as a system, the documentation is part of the part.
Show all 6 selection factors tap to expand
RF transparency: draw the line where the antenna's view begins
The first decision on a small cell is a map, not a material: which joints sit inside the antenna's field of view and which sit behind metal. Inside the RF window, only non-conductive materials — silicone foam (BISCO® HT-870 class), EPDM foam, plain PSA on plastic — because conductive filler attenuates and detunes the link.
Behind metal, the conductive families take over. Mark the RF-transparent zone on the gasket drawing and have the antenna team sign the gasket placement; transparency at the operating band is a property of the tested radome assembly, validated at the system level. [6]
Seam continuity at mmWave: gasket the seam, not just the door
At 24–48 GHz, apertures a few millimeters long radiate. Every housing seam — lid, cover, cable entry, vent — needs either continuous conductive contact (nickel-graphite frames, soft conductive solid for low-force covers) or a deliberate decision that it lives behind the shield boundary.
Filler chemistry still has to match the housing metal: nickel-graphite on plated steel and aluminum, nickel-aluminum corrosion-resistant grades on coastal aluminum, per the galvanic pairing on the vendor TDS. Specify resistivity class (ASTM D991), compression set (D395), and the mating finish on every conductive gasket callout. [1]
Combined EMI + weather duty: one compression, two jobs
Small-cell lids rarely have room for two gasket lines, so one part often carries both the shield contact and the ingress seal. The options ladder: a conductive elastomer that seals environmentally at its rated compression; a laminated construction pairing a conductive layer with a closed-cell weather layer; or two separate lines where the casting allows. IP framing comes from IEC 60529 and the outdoor-cabinet practice of GR-487 — both by designation, with the result belonging to the tested enclosure.
State latch force, gap range, and the required compression window; an EMI gasket only seals weather inside its compression window, and an over-gapped joint fails both jobs at once. [3]
The thermal path: a sealed node cools through its skin
No fans, no vents worth having, tens of watts of PA and FPGA dissipation: a small cell cools by conduction to a finned casting, and every clamped interface on that path is a TIM decision. Graphite (eGRAF® HITHERM™ class) carries thin, dry, repeatable paths; Gap Pad® TGP conformable fillers absorb the board-to-casting tolerance stack; Protect® and Sil-Pad® classes serve interfaces that must also insulate electrically (D5470 thermal and D149-class dielectric data on the same TDS).
State the real clamping pressure on the drawing: TIM data is pressure-dependent, and the TDS curve is only meaningful at the pressure the assembly applies. [5]
Vibration at the mount: specify the force window, not the thickness
Pole sway and strand vibration are low-amplitude, high-cycle inputs, and the clamp pad that isolates them is a spring specified by its compression-force-deflection curve. PORON® 4701-series urethane holds a force window for years because of its compression-set resistance; vinyl nitrile (ENSOLITE®, SBE-series) carries gentler loads at pole collars and wall standoffs.
A pad picked by gap fill alone either bottoms out (transmitting vibration straight through) or relaxes out of its window. Send the clamp geometry, bolt torque, and node mass; firmness grade and thickness fall out of those numbers. [8]
Kitting: design the install, not just the parts
A small-cell install happens on a lift at street level, and every loose gasket is a part that can blow into traffic. Kiss-cut multi-part kits put the node's whole soft-goods set on one liner — radome seal, lid gasket, TIM blanks, grommets, bracket pads — arranged in install order, labeled per the drawing, one kit per node. Kits also carry the paperwork: lot-code TDS records per material, which is what an equipment-level evaluation wants to see.
Decide kit contents at drawing release, not after the first crew improvises one; the kit drawing is the install procedure made physical.
5G small-cell failures you can prevent at spec
A pole-top radio fights heat, weather, and emissions at once. Its failures show up outdoors, months in — and each is set in the material callout.
Small cells run sealed and fanless in the sun. A TIM chosen by thickness, an open-cell seal, or a leaking shield seam is where these specs go wrong.
Show all 5 failure modes tap to expand
1. A gap pad chosen by thickness, not impedance
Fix — select the TIM by thermal impedance per ASTM D5470 at the actual mounting pressure.
2. An open-cell or absorptive seal outdoors
Fix — use closed-cell EPDM (D1056 class per TDS) sized to the required IEC 60529 IP rating.
3. An EMI leak at the radio enclosure seam
Fix — bond the seam with a conductive gasket to hold CISPR 32 emission limits.
4. Solar and thermal load under-managed on a pole-top unit
Fix — size the TIM and any insulation to the outdoor thermal environment, not bench conductivity.
5. Field-cut gaskets with gaps
Fix — die-cut perimeter and interface seals to the drawing so they close continuously.
Specification Tools
Two tools to take you from "we're deploying small cells" to here's the material set for the drawing package: an install-point selector that maps mount style and exposure to a candidate set, and a side-by-side comparison of every small-cell family on this page.
1. Install-point material selector
Pick where the node mounts and what the route exposes it to. The selector returns the candidate material set, the controlling properties, and what to send with the drawing. The default below is pre-built for a pole-top node in standard urban exposure; every candidate is also printed in the material reference section, so nothing here exists only behind a script. The output is a starting point for the engineering review, not a final selection: final material selection should be validated in the application.
Candidate set: pole-top node, standard urban exposure
Pole-top: wind-driven sway is the dominant vibration input, and the node hangs in full sun and rain. Clamp interfaces take PORON® 4701-series pads specified by compression window; the radome perimeter takes non-conductive silicone or EPDM foam; lid seams take nickel-graphite gaskets with the filler matched to the housing metal; the TIM stack runs graphite or Gap Pad® fillers per the clamping pressure. UV-exposed perimeter foams lean EPDM and silicone families per the grade TDS exposure data.
Send: housing and bracket drawings, housing metal and finish, latch and clamp forces, node mass, the RF-window outline, and the emissions band the radio has to clear (by designation; the result belongs to the tested radio).
2. Side-by-side: small-cell family comparison matrix
Every family called out on this page, with construction, the property that drives its selection, the standards its TDS cites, and the zone it serves. Click a column header to sort. Click any material name to jump to its accordion entry.
| Material | Construction | Selection driver | Standards on the TDS / by designation | Zone | |
|---|---|---|---|---|---|
| The RF window (non-conductive territory) | |||||
| BISCO® Silicone Foam (HT-870 Soft, BF-1000 Extra Soft)Closed-cell silicone | Cellular silicone foam | RF transparency + closure force | ASTM D1056; UL 94 per rated grade TDSs | Radome perimeter | |
| RE-Series EPDM Closed-Cell Foam (RE41E / RE42E)EPDM foam | Closed-cell EPDM | UV/ozone exposure history | ASTM D1056 (per TDSs) | Radome & shroud seals | |
| ENSOLITE® / SBE-Series Vinyl Nitrile (IG1, SBE41VN/42VN)Vinyl nitrile foam | Closed-cell VN foam | Conformability at low force | ASTM D1056 (per TDSs) | Collars, standoffs, pads | |
| The radio core (conductive territory) | |||||
| Nickel-Graphite Silicone (incl. UL 94 V-0 rated grades)Conductive elastomer | Filled silicone sheet | Seam continuity / resistivity | MIL-DTL-83528 context (by designation); ASTM D991, D395; UL 94 per rated TDSs | Lid & seam gaskets | |
| Nickel-Aluminum Corrosion-Resistant Grades (silicone & fluorosilicone)Conductive elastomer | Filled silicone / FVMQ | Galvanic pairing on aluminum | ASTM B117 exposure, D991 (per TDSs) | Coastal / roadside lids | |
| Fluorosilicone EMI Grades (fluid-exposed joints)Conductive FVMQ | Filled fluorosilicone | Fuel / oil adjacency | Compatibility per vendor TDS tables | Rooftop / roadside joints | |
| Conductive Solid Silicone (EC-2130 class)Conductive solid silicone | conductive solid silicone | Low closure force | ASTM D991; sponge classes per TDSs | Covers, grommets | |
| Conductive Foil Tapes (copper / aluminum)Foil + conductive PSA | Metal foil tape | Fixed seams / ground bonds | Adhesive joint: validate per bond framing | Seams, straps | |
| eGRAF® HITHERM™ Graphite + SpreaderShield™Flexible graphite | Graphite sheet | Thin, dry thermal path | ASTM D5470; UL 94 V-0 on HT-C3200 TDS | PA / module TIM | |
| Gap Pad® TGP + Sil-Pad® TSP + Protect® PadsFilled polymer TIMs | Conformable / reinforced pads | Tolerance stack + isolation | ASTM D5470; D149-class dielectric (per TDSs) | Board-to-casting TIM | |
| The mount (and the kit that ships it all) | |||||
| PORON® 4701 Series (4701-50 Firm, 4701-40V0)Microcellular urethane | Microcellular PU foam | Compression window (CFD) | D3574-class methods; UL 94 V-0 (40V0 TDS) | Clamp / bracket pads | |
| Kiss-Cut Multi-Part Install KitsMulti-material sets | Parts on liner, in order | Install logistics + traceability | Lot-code TDS records per material | Whole node | |
3. Fanless passive-cooling thermal budget
A sealed, fanless small cell or RRH radio cools by conduction to a finned casting and natural convection plus radiation off its skin — no fans, no vents worth having. Enter the dissipated power, the external surface area the casting presents, the ambient air plus a solar adder, and the conduction-path quality of your interface material, and the tool returns the casing-to-ambient rise, the rise across the TIM, and the estimated junction/case temperature with headroom to a limit you set.
The cross-section and the ΔT-vs-area chart redraw live. The passive coefficient h is a representative planning figure (6–10 W/m²K for a sealed outdoor casting), not a measured value for any specific housing; this tool screens magnitudes and steers the interface family, validated in the application.
Heat flows left to right: from the die, across the TIM into the casting, then off the finned skin to sun-exposed ambient. Each stage shows its computed temperature; the amber band is the rise the conduction path or the surface area has to carry.
Skip ahead and request your engineering review now
If your drawing set already calls out a conductive-elastomer grade, a radome seal, a TIM, or a bracket pad, send it over for engineering review against the TDSs and the standards language.
Small-cell material failures you can head off at spec
Small cells fail quietly and expensively: the truck roll costs more than the part, the failed node is forty feet up, and the root cause is usually a specification decision made months earlier. Five patterns cover most of what goes wrong on the materials side of a deployment.
On a node that gets evaluated as a system, the paperwork is part of the part. A correct material with an undocumented class, or a drawing that claims an IP result for a gasket, costs more schedule at review than any cutting error. Cite material classes per TDS and equipment standards by designation.
Show all 5 failure modes tap to expand
1. The conductive gasket that crept into the RF window
A late packaging change moved a seam, the EMI gasket line followed it, and the new line crossed the edge of the antenna's field of view.
The node passed every bench test that didn't measure pattern, then underperformed on air: attenuation and detuning from conductive filler sitting in the near field. The fix: draw the RF-transparent zone as a controlled feature on the gasket drawing, keep the radome perimeter on non-conductive foams (silicone foam, EPDM), and route every conductive part — gasket, foil tape, even a conductive PSA — around the marked window with the antenna team's sign-off.
2. The sub-6 seam budget that became a mmWave slot antenna
A housing platform that cleared emissions at 3.5 GHz was reused for a 28 GHz radio, fastener pitch and gasket gaps unchanged. At a tenth the wavelength, the same seams radiated, and the scan failure arrived at the worst possible time: after tooling. The fix: treat the shield boundary as a frequency-scaled design input.
Tighten gasket continuity on every seam that faces the new band — conductive frames instead of segmented strips, sponge in the low-force covers, foil-tape bridges on fixed seams — and re-check the fastener pitch against the highest operating band, not the legacy one.
Emissions results belong to the tested radio, per CISPR 32 / FCC Part 15 by designation. [2]
3. Galvanic corrosion at the coastal lid (the gasket did its job, once)
A silver-copper-filled gasket on a bare aluminum housing two blocks from the ocean: eighteen months later the flange showed white bloom, contact resistance had climbed, and the seam leaked both RF and rain.
The filler-to-housing galvanic couple drove the corrosion. The fix: on aluminum housings, lead the selection with the pairing — nickel-aluminum corrosion-resistant grades carry salt-fog exposure data per ASTM B117 on their TDSs, and the fluorosilicone version adds fluid resistance for salted-road spray. Specify housing metal and finish on every conductive-gasket callout; the grade follows. [7]
4. A TIM specified at a pressure the latch could not deliver
The TDS curve said the interface was fine; the casting said otherwise.
The thermal pad's impedance was read at a test pressure the small latch-and-screw lid did not reach, the PA ran hot, and the radio derated on summer afternoons — a capacity complaint that looked like a network problem. The fix: state the real clamping pressure on the drawing and read the ASTM D5470 data at that pressure; use conformable Gap Pad® TGP fillers where the tolerance stack eats the clamp travel, graphite where the joint is thin and flat, and insulating Sil-Pad® / Protect® classes where the interface must also isolate.
5. The install kit that was a plastic bag
Twelve loose gaskets in a zip bag, three of them similar-looking, one install on a lift in wind. The wrong pad went under the clamp, the right one blew into the street, and the closeout photos showed a radome seal seated half out of its channel. The fix: kit the node. Kiss-cut multi-part sets on liner hold every part in install order with the drawing's labels; the crew peels in sequence and nothing is loose at altitude.
The kit also carries the lot-code TDS records per material that the equipment evaluation wants to see. Decide kit contents at drawing release and pilot the kit with the first crew, not the tenth.
Material reference
Detailed specs for the eleven small-cell families referenced on this page: the conductive set (nickel-graphite silicone, nickel-aluminum corrosion-resistant grades, soft conductive solid, conductive foil tapes), the RF-window and weather set (BISCO® silicone foam, RE-series EPDM, vinyl nitrile), the thermal set (HITHERM™ graphite with SpreaderShield™, and the Gap Pad® / Sil-Pad® / Protect® pad classes), and the mount-and-kit layer (PORON® 4701 series, kiss-cut install kits).
Values are per the vendor TDS on file for each grade with the method named; equipment standards are cited by designation only, with the result belonging to the tested node. H-O die-cuts, kiss-cuts, slits, laminates, and kits every family to drawing.
Nickel-Graphite Silicone (incl. UL 94 V-0 Rated Grades)Lid & seam EMI gaskets · non-QPL commercial (not a MIL-DTL-83528 type) by designation · ASTM D991 / D395 per TDSs
Specify the resistivity class, the compression window, and the mating finish on the callout. The deep grade-level data for this family lives on the telecom & data center EMI shielding sibling page.
Nickel-Aluminum Corrosion-Resistant Grades (Silicone & Fluorosilicone)Coastal & roadside EMI gaskets · ASTM B117 salt-fog exposure per TDSs · fluid compatibility per vendor TDS tables
Lead the callout with housing metal and finish; the grade follows the pairing. Where the design also needs the QPL-framework silver-filled types, the sibling EMI page covers silver-copper and silver-aluminum classes in depth.
Conductive Solid Silicone + Conductive Foil TapesLow-closure-force covers, grommets, fixed seams & ground bonds · adhesive joints validated in the application
On powder-coated housings, plan masked conductive lands at the gasket and tape lines; a conductive part on an insulating finish shields nothing.
BISCO® Silicone Foam (HT-870 Soft, BF-1000 Extra Soft)RF-transparent radome & shroud seals · ASTM D1056 cellular methods · flame classes per rated grade TDSs
Specify channel depth, closure force, and the compression window per ASTM D1056; the grade falls out of the force budget.
RE-Series EPDM Foam + ENSOLITE®/SBE-Series Vinyl NitrileUV/weather-exposed perimeter seals, collars & interface pads · ASTM D1056 classes per TDSs
Exposure claims stay qualified: suitability for a given route and orientation is read from the grade TDS exposure data and validated in the application.
eGRAF® HITHERM™ Graphite + SpreaderShield™ Heat SpreadersPA-to-casting thermal paths & skin heat spreading · ASTM D5470 per TDSs · V-0 class on the HT-C3200 TDS
State the clamping pressure on the drawing; D5470 data is pressure-dependent. The full TIM selection logic lives on the server & network thermal interface sibling page.
Gap Pad® TGP Fillers + Sil-Pad® TSP / Protect® Insulating PadsBoard-to-casting tolerance stacks & insulate-while-conducting interfaces · ASTM D5470 / D149-class data per TDSs
Read the TDS thermal curve at your real assembly pressure, and keep electrically conductive graphite off interfaces that need these pads' isolation.
PORON® 4701 Series Microcellular Urethane (4701-50 Firm, 4701-40V0)Strand/pole-mount vibration pads & clamp interfaces · CFD-specified · V-0 class on the 40V0 TDS
Send clamp geometry, bolt torque, and node mass with the drawing; firmness grade and thickness fall out of those numbers. [8]
Kiss-Cut Multi-Part Install KitsThe node's full soft-goods set on liner, in install order · lot-code TDS records per material
PSA-backed kit parts are adhesive parts: performance depends on substrate, surface energy, temperature, exposure, dwell, pressure, surface preparation, and joint geometry; validate on the production finish in the application.
5G & small-cell materials: engineer-grade FAQ
Twelve of the questions we hear most from RAN, small-cell, and DAS hardware teams. If your question isn't here, send a drawing or call, engineering picks up.
Do these materials carry GR-487, IP, or FCC listings?
No material does, and no honest supplier will claim otherwise: GR-487 evaluates the cabinet, IEC 60529 IP codes attach to the tested enclosure, and CISPR 32 / FCC Part 15 emissions results belong to the tested radio. What the materials on this page carry is their own documentation: material-level classes such as UL 94 V-0 on the rated grade TDSs, the test methods behind their properties (ASTM D991, D395, D1056, D5470, B117), and lot-code traceability.
They support designs evaluated to the equipment standards; H-O supplies the converted layers and the paperwork, and the equipment designer owns the evaluation. [3]
What makes a radome seal RF-transparent, and which materials are commonly used?
Two things: no conductive filler, and a low effective dielectric footprint at the operating band. Conductive particles attenuate and detune the link, so the radome perimeter takes non-conductive materials by designation — closed-cell silicone foam (BISCO® HT-870 class), EPDM foam, BF-1000-class ultra-soft silicone for thin frames. Foam helps because it is mostly air, which keeps effective dielectric constant and loss low.
RF transparency at a specific band, however, is a property of the tested radome assembly, so gasket placement gets validated at the system level with the antenna team. [6]
Which EMI gasket suits a coastal or salted-road small-cell housing?
Lead with the galvanic pairing, not the resistivity. On aluminum housings in salt exposure, nickel-aluminum corrosion-resistant grades are the commonly specified answer, with salt-fog exposure data per ASTM B117 on their TDSs; the fluorosilicone version adds fuel and oil resistance for salted-road spray and rooftop mechanical spaces. Silver-copper fillers on bare aluminum drive galvanic corrosion and are the classic coastal failure.
Specify the housing metal and finish on the callout and match the test hours your program cites to the deployment severity. [7]
Can one gasket handle both EMI and weather sealing on a small-cell lid?
Often, yes — within its compression window. A conductive elastomer seals environmentally at its rated compression, and laminated constructions pair a conductive layer with a closed-cell weather layer where one material can't do both. The failure mode is the gap: an over-gapped joint loses shield contact and water sealing at the same time. State latch force, gap range, and the compression window on the drawing; ingress framing follows IEC 60529 and GR-487 design practice by designation, with the result belonging to the tested enclosure. [3]
Why do housing seams matter more at mmWave frequencies than at sub-6 GHz?
Because apertures radiate in proportion to wavelength, and mmWave wavelengths are short: about 10.7 mm in free space at 28 GHz versus roughly 86 mm at 3.5 GHz. A seam gap or fastener pitch that was electrically small on a sub-6 design can behave like a slot antenna at FR2 bands.
The converter-side response is continuity: one-piece gasket frames instead of segmented strips, soft conductive solid on low-force covers, and foil-tape bridges on fixed seams. The emissions result belongs to the tested radio per CISPR 32 / FCC Part 15, by designation. [2]
What thermal interface materials are used in fanless small-cell radios?
Three classes by job. Graphite (eGRAF® HITHERM™) for thin, dry, repeatable die-to-casting paths and skin-level heat spreading; conformable Gap Pad® TGP fillers where the board-to-casting tolerance stack eats the clamp travel; and insulating Sil-Pad® / Protect® pads where the interface must also block current, with thermal (ASTM D5470) and dielectric data on the same TDS. The constant across all three: state the real clamping pressure on the drawing, because TIM data is pressure-dependent. [5]
What goes under a strand- or pole-mount bracket?
An elastomer pad specified by force window. PORON® 4701-series microcellular urethane is the common clamp-interface choice because its compression-set resistance keeps the preload window valid across years of pole sway and strand vibration; vinyl nitrile (ENSOLITE® IG1, SBE-series) carries gentler loads at pole collars and wall standoffs; firm grades like 4701-50 double as shims between flat brackets and curved poles. Send clamp geometry, bolt torque, and node mass; firmness grade and thickness fall out of those numbers. [8]
Are EPDM and silicone foams suitable for UV-exposed outdoor seals?
They are the families commonly specified for that duty: EPDM for its long UV and ozone exposure history at street-level economics, and cellular silicone where the joint also wants silicone-class temperature endurance or a flame class on the rated grades.
Both are qualified claims, not blanket ones — suitability for a given route, orientation, and service life is read from the grade TDS exposure data, and final material selection should be validated in the application. Vinyl nitrile serves interface-pad duty but is generally not the first pick for full-sun perimeter seals. [6]
Can H-O supply the whole node's soft goods as one kiss-cut install kit?
Yes: radome seal, lid gasket, TIM blanks, entry grommets, and bracket pads can ship kiss-cut on shared liners, arranged in install order and labeled per the drawing, one kit per node, one part number to order. Kits run on CNC knife kiss-cutting and the assembly-and-kitting line, with material traceability and lot-code TDS records per material — the documentation an equipment-level evaluation wants to see. Decide kit contents at drawing release and pilot the kit with the first crew.
Does H-O test shielding effectiveness or run emissions testing?
No. H-O is a converter: we die-cut, kiss-cut, slit, laminate, and kit shielding and sealing materials to drawing, and we supply the vendor TDSs and lot-code traceability behind them. Shielding-effectiveness measurements, emissions scans (CISPR 32 / FCC Part 15), ingress testing (IEC 60529), and GR-487 evaluations are run by the equipment maker or its test house on the tested radio or enclosure, and the results belong to that tested system. What we contribute to that file is correct material documentation and consistent parts. [2]
Does H-O mold or extrude these materials, or convert them?
H-O and converts sheet, roll, and sponge stock to drawing; we do not mold or extrude in-house, and molded or extruded conductive profiles are coordinated through a partner network. Conversion runs in Winsted, Connecticut under an ISO 9001:2015 certified quality management system with material traceability and lot-code TDS records. Samples typically ship in 3–5 business days for common configurations on materials we keep on hand; standard production runs ship about 2 weeks after drawing approval.
What should be on the drawing set so the quote comes back right the first time?
By zone: for the RF window, the transparent-zone outline and the radome frame's closure force; for the radio core, the housing metal and finish, latch forces, seam map, and TIM clamping pressures; for the enclosure, gap ranges, compression windows, and the exposure (coastal, roadside, industrial); for the mount, clamp geometry, bolt torque, and node mass.
Plus quantities for prototype and production, kit contents if you want one part number per node, and the standards language you need on the paperwork (material classes per TDS; equipment standards by designation).
"Recommend the set" is a valid callout: that is what the engineering review is for.
Glossary: terms used on this page
Quick reference for the radio, shielding, and converting terminology used throughout. Each entry links to the relevant standard or test method where applicable.
Small cell
A low-power, short-range cellular node — pole-, strand-, wall-, or rooftop-mounted — that densifies coverage and capacity below the macro layer. Materially, a sealed fanless radio plus an enclosure plus a mount, which is why its converter-side set spans EMI, sealing, thermal, and vibration families on one drawing.
FR2 / mmWave
The 5G frequency range covering roughly 24–48 GHz (with band extensions above that). Short wavelengths — about 10.7 mm at 28 GHz — mean housing seams, fastener pitches, and gasket gaps must be re-checked against the operating band, not carried over from sub-6 designs.
Radome
The polymer cover the antenna radiates through. Its perimeter seal is the one gasket on the node that must be non-conductive: conductive filler at the radome edge attenuates and detunes the link. Sealed with silicone or EPDM foams by designation, with placement signed off by the antenna team.
RF transparency
A material's ability to pass RF energy with minimal attenuation or distortion, governed by dielectric constant and loss behavior at the operating band. Cellular foams help because they are mostly air. On this page it is treated as a system-level property: it belongs to the tested radome assembly, and gasket materials support it by designation and placement.
Shielding effectiveness (SE)
The attenuation an enclosure provides against electromagnetic energy, in dB, measured on the enclosure — not on a gasket coupon in isolation. Gasket continuity, aperture sizes, and joint impedance set it together, which is why SE numbers attach to tested assemblies and this page cites the measurement context by designation.
MIL-DTL-83528 (by designation)
The detail specification for electrically conductive elastomeric shielding gaskets, whose type designations (filler chemistry plus base polymer, e.g. Type M nickel-graphite silicone) the industry uses as shorthand, per [1]. Cited by designation; QPL status belongs to the qualified material per the vendor's documentation.
Telcordia GR-487 (by designation)
Generic requirements for electronic equipment cabinets: the design practice outdoor telecom enclosures — including small-cell street furniture — are commonly framed on. It evaluates the cabinet, not its gaskets; on this page it is design context cited by designation, and the materials support designs evaluated to it.
IP code / IEC 60529 (by designation)
The ingress-protection classification (dust and water) defined by IEC 60529 [3]. An IP result attaches to the tested enclosure as a whole; a gasket supports the rating but does not carry one on its own, which is the phrasing this page keeps on every sealing callout.
Galvanic compatibility
The electrochemical pairing between a conductive gasket's filler and the housing metal it contacts. A poor couple (silver-copper on bare aluminum) corrodes in salt exposure; the nickel-aluminum grades exist for aluminum housings, with exposure data per ASTM B117 [7] on their TDSs. Specify both mating finishes on every conductive callout.
Compression set
Permanent deformation after sustained compression, per ASTM D395 [8]. The property that decides whether a lid gasket still makes shield contact and a clamp pad still holds preload years into service; the long-game number on every elastomer TDS on this page.
Compression force deflection (CFD)
The pressure a cellular material exerts at a given compression — the curve that turns a foam pad into a specifiable spring. Reported per D3574-class and ASTM D1056 [6] methods on the TDSs; bracket pads and gaskets are specified by their CFD window, not their thickness.
Kiss-cut kit
Parts cut through the material but not the liner, so a multi-part set peels in sequence from one sheet. For small cells: the node's full soft-goods set on shared liners, in install order, labeled per the drawing — the install procedure made physical, with lot-code TDS records per material.
Strand mount
A small cell hung from the steel messenger strand of an aerial cable run. The strand moves with wind and traffic-induced vibration continuously, making the clamp-interface pad a high-cycle isolation part specified by force window, with compression-set resistance as the life-limiting property.
Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
Standards, test methods & technical references
The standards, test methods, and vendor technical data sheets cited throughout this page, listed by name and designation. Equipment standards are cited by designation: they evaluate radios, enclosures, and qualified materials, and the result belongs to the tested system or listed grade. Standards editions current as of June 2026; verify against the publishing body before final spec.
H-O converts materials tested to the material-level methods on the source vendor's TDS; H-O does not certify systems or independently test materials against the standards unless explicitly stated on the quote.
[1] MIL-DTL-83528 / SAE-AMS-DTL-83528 (by designation)
Detail specification for electrically conductive elastomeric shielding gaskets: the type designations (filler chemistry and base polymer) and QPL framework the industry quotes for conductive elastomers. Cited by designation; QPL status belongs to the qualified material per the vendor's documentation.
[2] CISPR 32 & FCC Part 15 Subpart B (by designation)
CISPR 32 (electromagnetic compatibility of multimedia equipment, emission requirements) and FCC Part 15 Subpart B (unintentional radiators). The emissions framework radio equipment housings are evaluated against at the equipment level; intentional-radiator authorization for the radio itself follows its own FCC process. Both cited by designation; results belong to the tested equipment.
[3] IEC 60529 (by designation)
Degrees of protection provided by enclosures (IP Code): the dust- and water-ingress classification framework for enclosure design, alongside Telcordia GR-487 (generic requirements for electronic equipment cabinets) as the outdoor-telecom design context. Both evaluate the tested enclosure; cited by designation, with gaskets supporting — not carrying — the result.
[4] UL 94
Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances. The flammability classes (V-0, V-1, HBF) that appear on rated conductive-elastomer, foam, and graphite grade TDSs; the class belongs to the listed grade, per its TDS.
[5] ASTM D5470
Standard Test Method for Thermal Transmission Properties of Thermally Conductive Electrical Insulation Materials. The method behind the thermal-impedance values on TIM TDSs; measured at stated pressures, which is why this page repeats "read the curve at your real assembly pressure."
[6] ASTM D1056
Standard Specification for Flexible Cellular Materials — Sponge or Expanded Rubber. The classification behind the compression classes on the EPDM, silicone-foam, and vinyl nitrile grade TDSs used at radome perimeters, enclosure seals, and interface pads on this page.
[7] ASTM B117
Standard Practice for Operating Salt Spray (Fog) Apparatus. The exposure practice behind the salt-fog data on corrosion-resistant EMI grade TDSs; test hours are matched to deployment severity (coastal, salted roadside) by the equipment designer.
[8] ASTM D395
Standard Test Methods for Rubber Property: Compression Set. The method behind the compression-set values on conductive-elastomer and foam TDSs — the property that governs lid-gasket shield contact and clamp-pad preload life on a node that vibrates for a decade.
Updated . Standards editions current at publication; verify against the publishing body before final spec. H-O converts materials tested to the methods cited; H-O does not certify systems. Lot-specific documentation available on request.
Get a small-cell materials engineering quote
Send a drawing set, a housing sample, or the node's soft-goods list. We typically respond within one business day with a material recommendation, prototype lead time, and TDS verification against your gap ranges, latch and clamp forces, and any flame-class callouts.
See also: related H-O application pages
Engineering content for the parent shielding application, the adjacent telecom sub-applications, the kitting capability behind the install kits, and the owning industry hub. Each page covers material selection, failure modes, and converter-side process detail for its application family.
Parent application
EMI & EMC shielding
The cross-industry shielding overview: conductive-elastomer families, filler chemistries, and the selection logic this page applies to small cells and mmWave radios.
Read the page
Sibling sub-application
Telecom & data center EMI shielding
The deep grade-level data behind this page's conductive families: rack and cabinet shielding, vent panels, board-level shields, and the silver-filled QPL-framework types.
Read the page
Sibling sub-application
Telecom power & electrical insulation
Dielectric barriers, busbar wraps, and creepage spacers for telecom rectifiers, DC plant, and power shelves.
Read the page
Sibling sub-application
Outdoor telecom & cabinet thermal management
The full-size version of the same street: GR-487-framed cabinet design practice, solar-load insulation, and heat-exchanger gasketing for the cabinets small cells backhaul into.
Read the page
Capability
Assembly, kitting & value-added
The capability behind the install kits: kiss-cut multi-part sets on liner, sequenced and labeled per drawing, with lot-code TDS records per material.
Read the page
Industry hub
Telecom & data centers
The full telecom and data-center application family: thermal, EMI, power insulation, outdoor sealing, vibration, and white-space airflow.
Read the page
Material data & standards. All resistivity, compression, thermal, and flame-class values on this page are taken from the source vendor's technical data sheets with the method named (ASTM D991, D395, D1056, D3574-class CFD methods, D5470, B117; UL 94 classes per the listed grade TDSs).
Equipment frameworks (MIL-DTL-83528, Telcordia GR-487, IEC 60529, CISPR 32 / FCC Part 15) are cited by designation only: they evaluate radios, enclosures, and qualified materials, the evaluation belongs to the equipment maker and its test house, and the materials on this page support designs commonly framed by them.
H-O converts materials; H-O does not design radios, run emissions or ingress testing, or certify systems, and does not independently certify materials against the standards cited. Performance depends on grade, geometry, compression, adhesive system, and environment; final material selection should be validated in the application against the vendor TDS.
Conversion scope. H-O and converts sheet, roll, and sponge stock to drawing in Winsted, Connecticut: die-cut and kiss-cut gaskets, TIM blanks, and pads, laminated EMI-plus-weather constructions via laminating & material bonding, and kitted per-node install sets, with material traceability and lot-code TDS records. H-O does not mold or extrude in-house; molded, extruded, or wire-mesh conductive profiles are coordinated through a partner network. Lead-time and MOQ details are in the process strip and the quote form above.