Silicone Materials: Engineering Guide to Silicone Rubber, Foam, Sponge & Specialty Silicones
Silicone is not one material. It is a family of elastomers built on a silicon-oxygen backbone that can be supplied as solid rubber, closed-cell sponge, or low-density foam, and formulated for heat, flame, fuel, electrical conduction, thermal conduction, patient contact, food contact, or in-line metal detection. This guide explains how the forms and formulations differ, which properties to evaluate for each job, and how H-O Products converts silicone sheet and roll stock into finished gaskets, seals, pads, and insulators.
Written for: mechanical, electrical, manufacturing, quality, packaging, medical-device, and aerospace engineers, and the OEM sourcing teams who buy converted silicone parts to a drawing.
Silicone is the elastomer to specify when a gasket, pad, seal, or insulator must keep working across a wide temperature span, outdoors, next to ozone-producing electrical equipment, or under a regulation that names the material. It comes as solid sheet (durometer), closed-cell sponge (CFD, molded skin), and cast foam (CFD, lowest closure force and lowest compression set), and in fourteen specialty formulations covered on this page, from fluorosilicone and conductive grades to medical, food-contact, and metal-detectable silicone. H-O Products, an ISO 9001:2015 certified organization in Winsted, Connecticut, converts sheet and roll silicone from Rogers BISCO®, Silicone Engineering, SSP, Saint-Gobain, Henkel Bergquist®, and specialty mills into finished die-cut, waterjet-cut, laminated, and kitted parts to your drawing. Skip to the quote form →
Silicone rubber (VMQ) is a synthetic elastomer with a silicon-oxygen backbone that stays flexible over a wider temperature span than hydrocarbon rubbers, resists UV and ozone without additives, and holds its compression set at temperatures where EPDM and neoprene relax. It is supplied to converters as solid sheet (rated by Shore A durometer), closed-cell sponge (a blown high-consistency rubber), and cellular foam (a cast, addition-cured low-density material), each rated by compression force deflection. Its weak points are tear strength, abrasion, and swelling in fuels and oils, which is why fluorosilicone (FVMQ) and reinforced grades exist.
Choose the form by closure force and sealing job, the formulation by the environment and the regulation the finished equipment must meet, and the converted construction (thickness, adhesive, cut process) by the assembly. The sections below walk through each decision with manufacturer data.
Property values on this page are quoted from the source manufacturer TDS or the cited standard, not from H-O testing. H-O converts sheet and roll silicone; the silicone itself is compounded, calendered, cast, or molded by the material manufacturer. Ratings such as UL 94, FDA 21 CFR 177.2600, USP Class VI, and AMS callouts belong to the specific grade, and a finished assembly earns its own rating at the system level.
ASTM D1056 · ASTM D6576 · ASTM D3574 · ASTM D395 · ASTM D2240 · ASTM D412 · ASTM D624 · ASTM D149 · ASTM D257 · ASTM D5470 · ASTM E595 · ASTM D471 · ASTM D1149 · UL 94 · UL 50E · FAR 25.853 · ASTM E162 / E662 · SAE AMS 3195 / 3196 / 33xx · A-A-59588 · MIL-DTL-25988 · MIL-DTL-83528 · FDA 21 CFR 177.2600 · EC 1935/2004 · USP Class VI · ISO 10993 · ISO 22196 · IEC 60529 · NEMA 250
- Low closure-force enclosure seal: silicone foam (BISCO HT-870 / BF-1000 class)
- General NEMA / IP gasket, firmer, smooth skin: closed-cell sponge
- Bolted flange, washer, high-pressure seal: solid silicone sheet
- Fuel, oil, or hydraulic-fluid contact: fluorosilicone (FVMQ)
- EMI gasket or ground path: conductive silicone
- Heat sink or battery module interface: thermally conductive silicone pad
- Patient-contact or sterilized device: platinum-cured medical silicone
- Food, beverage, dairy, pharma seal: FDA-compliant grade or metal-detectable silicone
- Aircraft cabin, rail, or switchgear flame duty: UL 94 V-0 / FST-tested grade
- Vacuum, optics, or spacecraft electronics: low-outgassing grade
Where are you in the material decision?
This page serves engineers who already have a grade on the drawing and engineers who are still deciding whether the part should be foam, sponge, solid, or a specialty formulation. Pick the path that matches where you are.
Send a drawing, get a quote
BISCO® HT/BF foam, RS or kSil® sponge, solid silicone by durometer, SSP conductive grades, Bergquist® thermal pads, fluorosilicone, FDA, medical, or metal-detectable sheet, with or without adhesive, to your drawing.
Skip to the quote form →Walk through silicone selection
Foam vs sponge vs solid, 14 specialty families, 18 engineering properties explained by how they are used, a selection matrix, a decision flow, and the cases where silicone is the wrong answer.
Start with foam vs sponge vs solid →-
1Send drawingUpload a DXF, STEP, or PDF, or describe the gasket, pad, or insulator and its environment. A sample part works too.
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2Material reviewEngineering checks the candidate grade against the manufacturer TDS: closure force, compression set, service temperature, fluid exposure, flame or regulatory requirement, and adhesive compatibility.
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3PrototypeSamples typically ship in 3–5 business days for common die-cut configurations on materials we commonly convert. Made-to-order; MOQ varies by material and part.
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4ProductionStandard production runs ship about 2 weeks after drawing approval, including kiss-cut-on-liner and laminated configurations. Expedited service available. Ongoing parts run with lot traceability and TDS records.
Which silicone are you specifying?
Eleven entry points. The three material forms come first because form decides closure force and sealing behavior; the specialty families change chemistry or fillers to meet an environment or a regulation.
What is silicone rubber?
Silicone rubber is a synthetic elastomer whose polymer backbone is a chain of alternating silicon and oxygen atoms (a polysiloxane) with organic side groups, most often methyl, attached to each silicon. The Si–O bond is stronger than the C–C bond of hydrocarbon rubbers and the backbone is unusually flexible, which is why silicone stays rubbery at low temperature, tolerates heat, and ignores ultraviolet light and ozone without the antioxidant packages that EPDM and neoprene rely on.
The side groups define the sub-family, and the sub-family drives the ASTM D1418 designation you will see on data sheets:
| Designation | Side groups | What it buys you | Typical use in converted parts |
|---|---|---|---|
| VMQ (methyl-vinyl) | Methyl + a small fraction of vinyl for cross-linking | The general-purpose silicone. Balanced heat resistance, compression set, and cost. | Most solid sheet, sponge, and foam gasketing on this page |
| PVMQ (phenyl-vinyl-methyl) | Phenyl groups added | Lower glass-transition temperature; flexible well below −60 °C. A-A-59588 Class 1 “extreme low temperature” grades are phenyl silicones. [1] | Cold-start aerospace and cryogenic-adjacent seals |
| FVMQ (fluoro-vinyl-methyl) | Trifluoropropyl groups replace some methyls | Resistance to fuels, oils, and non-polar solvents that swell VMQ. Costs more; loses some hot-air and tear performance. See fluorosilicone. | Fuel-zone, hydraulic-zone, and engine-bay seals |
| Filled / compounded VMQ | Base VMQ plus functional fillers | Silver, nickel-graphite, or carbon for conductivity; ceramic fillers for thermal conductivity; halogen-free flame packages; ferrous additive for metal detection. | EMI gaskets, thermal pads, V-0 gaskets, detectable food-line seals |
Two more facts explain most of silicone’s behavior. First, silicone is a low-surface-energy polymer (Avery Dennison groups silicone with the hydrocarbon and fluorocarbon polymers at roughly 18–40 mJ/m², against 35–50 for common engineering plastics and far more for metals and glass), which is why ordinary acrylic adhesives wet it poorly and why adhesive backing needs its own section. [2] Second, the silicone network is more open than a hydrocarbon rubber network: gas permeability is high, tensile and tear strength are modest, and the material relies on reinforcing silica and, in some grades, fabric or fiberglass to gain mechanical strength.
Silicon is the element (Si), a semiconductor used in wafers and solar cells. Silicone is the polymer family built from silicon, oxygen, carbon, and hydrogen. Data sheets, drawings, and purchase orders should say silicone; “silicon gasket” is a common misspelling that describes a material that does not exist.
Silicone at a glance: which properties are universal and which depend on the grade
Engineers are often handed a single line such as “silicone: −67 °F to 400 °F” and asked to design from it. The table below separates the properties that hold for practically all silicone from the ones that vary so widely between grades that a universal number is meaningless. Use it to decide which values you must pull from the specific TDS before releasing a drawing.
| Property | Universal to silicone? | What actually varies | Where it is quantified on this page |
|---|---|---|---|
| Reliably true across the family | |||
| UV and ozone resistance | Yes | Practically all VMQ/FVMQ grades resist UV and ozone cracking without special additives; ASTM D1149/D1171 exposure is rarely a selection driver. [3] | Weathering |
| Low-temperature flexibility | Yes (to about −55 °C) | Standard VMQ passes low-temperature flex at −55 °C (BISCO® foams: ASTM D746 at −55 °C); phenyl grades reach −100 °C and below. [4] [63] | Temperature |
| Electrical insulation (unfilled grades) | Yes | Unfilled silicone is a good dielectric (volume resistivity on the order of 10¹⁴ Ω·cm for HT-800 foam per ASTM D257). Filled conductive grades are, by design, the opposite. [4] | Electrical |
| Compression-set retention at heat | Yes, relative to other elastomers | Silicone and PORON® retain 45–75% of sealing force after 60 h at 25% compression versus 15–35% for EPDM and neoprene in Rogers’ comparison; the absolute number still depends on form and cure. [5] | CFD vs compression set |
| Poor resistance to fuels, oils, and non-polar solvents (VMQ) | Yes | General VMQ swells in hydrocarbon oils (Shin-Etsu reports roughly +26 to +30% volume in IRM 903 at 150 °C/72 h for KE-941 to KE-971-U grades versus under 5% for fluorosilicone). [6] | Chemical resistance |
| Grade-dependent: pull the number from the specific TDS | |||
| Upper service temperature | No | BISCO® HT/BF foams list +200 °C continuous; general-purpose solids are commonly rated to about 200–230 °C; specific high-temperature solids publish heat-aging data at 300 °C. Continuous, intermittent, and peak ratings are different numbers. [4] [7] | High-temperature silicone |
| Hardness / firmness | No | Solid: 10–90 Shore A across the catalog. Sponge and foam: CFD from under 2 psi (BF-2000 class) to over 20 psi (HT-840 class) at 25% deflection. [8] | Durometer, CFD |
| Compression set | No | Cast foam: about 2–5% (ASTM D1056, 100 °C/22 h/50%). Blown sponge: 15–20% typical on the same basis, and AMS 3195/3196 permit up to 60%. Solids: ≤25% (D395, 150 °C/70 h) for BISCO HT-1200. [17] [10] | CFD vs compression set |
| Density | No | Foam 10–28 pcf; sponge roughly 17–37 pcf; solid specific gravity about 1.1–1.7 depending on filler (HT-6240 1.07; filled and conductive grades higher). [8] [31] | Density |
| Tensile, tear, elongation | No | Solid sheet spans roughly 700–1,500 psi tensile, 100–900% elongation, 75–250 ppi tear across commercial, medical, and high-tear grades; foams are an order of magnitude lower. [11] | Tensile, Tear |
| Flammability rating | No | UL 94 V-0 is a per-grade, per-thickness recognition (BISCO® HT/BF foams under UL file E83967). Many commercial solids are HB or unrated. [12] | Flame-retardant silicone |
| Regulatory status (FDA, USP VI, ISO 10993, EC 1935/2004) | No | Depends on formulation, color, and cure system. A gray FDA foam does not make the black version compliant; a medical grade is tested to USP Class VI or ISO 10993, not “inherently” biocompatible. | Food-contact, Medical |
| Outgassing (ASTM E595) | No | Most cellular silicone fails the 0.10% CVCM screen; specific low-volatile solid grades pass. [13] | Low-outgassing silicone |
Silicone foam vs silicone sponge vs solid silicone
The three forms share a chemistry and almost nothing else that matters to a gasket. Solid silicone is a non-cellular rubber rated by durometer. Silicone sponge is a high-consistency rubber expanded with a blowing agent into closed cells under a molded skin. Silicone foam is a liquid two-part system that is cast and cured, with the cure reaction itself generating the gas that expands the matrix. The manufacturing route sets the cell structure, the cell structure sets the compression behavior, and the compression behavior sets closure force, sealing pressure, and long-term recovery.
“Foam” and “sponge” are not interchangeable engineering terms. Some manufacturers use them loosely, and Rogers itself calls RS-700 series “sponge” and HT-800 series “cellular silicone” while some distributors call both “foam.” On a drawing, call out the grade or the specification (AMS 3195, ASTM D1056 2D2, ASTM D6576 Soft-Medium) rather than the word. The two materials differ by a factor of about 5–10 in compression set on the same test basis. [9] [10]
The short version
| Form | Rated by | Recovery (compression set) | Choose it for | Its limit |
|---|---|---|---|---|
| Solid silicone | Shore A durometer, 10–90 A | ≤25% (D395, 150 °C/70 h) on BISCO HT-1200 class | Bolted flanges, washers, insulators, fluid pressure, thin gauges | Needs high closure force and a controlled gap |
| Silicone sponge | CFD at 25%, ≈2–25 psi; molded skin | ≈15–20% typ. (D1056, 100 °C/22 h); AMS 3195/3196 allow 60% | Enclosure doors and panels on stiff flanges; AMS/mil callouts | Higher set than foam; wide firmness bands |
| Silicone foam | CFD at 25%, ≈1–22 psi; no molded skin | ≈2–5% (D1056, 100 °C/22 h) | Lowest closure force; thin flanges; long-term seals; EV cushioning | Low tear strength; surface cells need liner, PSA, or skin |
The full engineering comparison (structure, measurement, compression and sealing behavior, mechanicals, water absorption, thickness, applications, reasons and limitations) and the deep dive into each form are on Silicone foam vs sponge vs solid.
Silicone selection matrix: from application requirement to material family
Start from the job, not the material. Each row names the requirement, the silicone family most likely to satisfy it, the property that decides between candidate grades, representative material types in the H-O catalog, and the design risk that most often causes the part to fail review.
| Application requirement | Likely silicone family | Property to evaluate | Potential material type (catalog examples) | Primary design risk |
|---|---|---|---|---|
| Low closure-force seal (plastic housing, thin lid, latch-closed door) | Cast silicone foam, soft to medium | CFD at design deflection; compression set (D1056) | BISCO® BF-2000, BF-1000, HT-870, HT-800 | Narrow gasket lands that tear or leak; specifying a firm sponge the flange cannot compress |
| IP / NEMA environmental enclosure (Type 4/4X, IP66/67) | Silicone foam or closed-cell sponge | Water-seal leak rate at head; deflection 30–40%; UL 50E gasket tests | HT-800 / HT-820; RS-800; kSil® KSV004; R10480 | Corner and splice leakage; ratings claimed from material instead of enclosure test |
| High-temperature gasket (≥200 °C continuous) | High-temperature solid; post-cured HCR; foam to its rating | Heat-aging retention; continuous vs intermittent rating; compression set at temperature | Extreme High-Temperature sheet; kSil® GP; HT-1200 (to 218 °C per TDS) | Adhesive or liner rated below the silicone; intermittent rating used as continuous |
| Food-processing seal | FDA-compliant solid or sponge, platinum-cured preferred | 21 CFR 177.2600 status of the grade and color; CIP chemistry; EC 1935/2004 if exported | FDA white / translucent solids 20–80 A; BF-1000, HT-800 gray; Norseal® FDA sponge | Non-food adhesive in the product zone; assuming all colors of a grade are compliant |
| Metal-detectable food-processing gasket | Metal-detectable silicone, solid or sponge | Magnet-pull / detection data; detector trial on the actual line; FDA status | H-O Metal Detectable Grade sheet 40–85 A; metectSil™ ST/XP/XS/SP (manufacturer TDS on request) | Treating a manufacturer test specimen as a line detection threshold |
| Fuel-resistant aerospace seal | Fluorosilicone (FVMQ) solid or sponge | Fluid immersion (D471) in the actual fuel or oil; MIL-DTL-25988 / AMS 3323–3331 callout | FVMQ calendered sheet; Norseal® R10490 sponge; SSP 502F conductive FVMQ | Using VMQ because “silicone resists chemicals”; FVMQ exposed to ketones or brake fluid |
| EMI gasket | Electrically conductive silicone or fluorosilicone | MIL-DTL-83528 Type; volume resistivity; shielding effectiveness; galvanic pairing | SSP 2569 (Type A), 2368 (Type B), 502 series Ni-Gr; BISCO EC-2130 | Confusing thermal with electrical conductivity; over-compression of filled elastomer |
| Thermal interface (device to heat sink; battery module to cold plate) | Thermally conductive silicone pad (gap filler or reinforced insulator) | ASTM D5470 impedance at clamping pressure and thickness; dielectric breakdown; gap range | Bergquist® Gap Pad® TGP 1000–5000; Sil-Pad® TSP 900–3500; PROTECT® 1500FG | Thickness chosen from catalog instead of measured gap |
| Medical cushioning or device seal | Platinum-cured medical silicone (solid or MS-series foam) | USP Class VI / ISO 10993 endpoints for the contact class; sterilization compatibility | Medical Grade sheet 30–70 A; SSP2390; BISCO MS-1600 / MS80 | Untested adhesive laminated to a tested silicone |
| Flame-rated aerospace or rail pad | UL 94 V-0 / FST-tested foam, sponge, or solid | FAR 25.853 (vertical burn, OSU, smoke) or EN 45545-2 / NFPA 130 report at the thickness | BISCO HT/BF foams; kSil® V-0 sponge; HT-6360; RS-800; BISCO 7xxx sponge where BMS 1-60 / BMS 1-23 is called out | Assuming a V-0 rating covers FAR 25.853 heat release and smoke |
| Electrical insulation (barrier, spacer, standoff) | Unfilled solid silicone, or a dedicated film | Dielectric strength (D149) at thickness; resistivity; creepage set by equipment standard | Commercial solids 50–70 A; HT-6240; kSil® GP; or polyimide / aramid films | Using a cellular gasket as an insulation barrier |
| Outdoor equipment (telecom, solar, transit) | Silicone foam or sponge; solid for wear surfaces | Compression set at summer temperature; adhesive weathering; water-seal design | HT-800 / HT-820; RS-800; kSil® KSV; solid 50–60 A | Adhesive, not silicone, is the first thing to fail outdoors |
| Low-outgassing electronics or optics | Low-volatile solid silicone | ASTM E595 TML and CVCM for silicone and adhesive; post-cure | Low Outgassing Silicone Sheeting 40–70 A | Qualifying the silicone and not the PSA and liner |
| EV battery module cushioning / thermal-runaway barrier | Cast silicone foam; MF1 bun; fire-barrier foam | CFD over life (stress relaxation), thermal conductivity, UL 94 / flame burn-through | BF-1000, HT-800, MF1, FPC | Sizing pad thickness for day-one CFD without swell and set over cycles |
How to select a silicone material
There is no single best silicone. The flow below orders the questions so that each answer narrows the field before the next one is asked. It begins with whether silicone belongs in the joint at all, because the honest answer is sometimes EPDM or a urethane foam.
The same flow as a checklist
- Confirm silicone belongs. If the joint lives between −40 and +120 °C, indoors, with no regulatory driver and no long-term heat, EPDM, neoprene, nitrile, or PORON® may be cheaper and tougher. See when silicone is not the right material.
- Rule on fluids. Fuel, oil, hydraulic fluid, or non-polar solvent contact routes you to fluorosilicone. Water, steam, alcohols, and most CIP chemistry keep you in VMQ.
- Apply the functional requirement. EMI, heat path, patient contact, food contact, flame, or outgassing each select a specialty family and, usually, a specific qualified grade.
- Match form to closure force. Compute available force from the fasteners or latches, divide by the gasket footprint, and compare with CFD at your deflection. Low force: foam. Moderate force with stiff flanges: sponge. High force or fluid pressure: solid.
- Set the grade. Choose firmness or durometer, then check compression set on the correct basis, thickness against the gap and tolerance stack, and the temperature rating of every layer, including adhesive.
- Design for converting. Radius inside corners, keep lands at or above 1.5× thickness where possible, decide kiss-cut vs through-cut, and choose the cut process (see converting).
Send the drawing and the grade for an engineering review
If your drawing already calls out a BISCO®, kSil®, SSP, Norseal®, Bergquist®, PROTECT®, or H-O silicone grade, with or without adhesive, send it over. Engineering checks it against the current TDS and quotes the converted part.
Silicone material families H-O converts
Eight families, grouped by the job they do rather than by brand. Each card gives the properties an engineer needs to shortlist, cites the manufacturer TDS, and links to the grade pages. H-O maintains working material relationships with Rogers (BISCO® and Silicone Engineering kSil®), Specialty Silicone Products (SSP), Saint-Gobain (Norseal®), Henkel (Bergquist®), and specialty sheet mills; every part is converted to order from sheet or roll stock.
Show all 8 material families H-O converts tap to collapse
BISCO® HT / BF cellular silicone foamLow closure force · 1.5–22 psi CFD · 2–5% compression set · −55 to +200 °C per TDS
Values per Rogers data sheets 180-070 (HT-800), 180-073 (HT-870), 180-071 (HT-820), 180-072 (HT-840), 180-048 (BF-1000), 180-049 (BF-2000). [4] [8] Grade pages: HT-800, HT-820, HT-840, HT-870, BF-1000, BF-2000. Related: MF1 bun, RF-120 heat shield.
Silicone sponge: BISCO® RS / 7xxx and kSil® V-0 (closed cell, flame-retardant)Smooth skin · 2.8–20 psi CFD · UL 94 V-0 grades · AMS 3195/3196 class gasketing
Values per H-O product pages and the Rogers / Silicone Engineering TDS on file. [10] [15] [68] Grade pages: RS-800, RS-870, 7130 Soft FR, 7304 Medium, 7330 Firm FR, 7430 Firm FR, KSV001, KSV004, A2 sound barrier.
Solid silicone sheet: commercial, FDA, BISCO® HT-1200, kSil® GP / US20–90 Shore A · 700–1,300 psi · washers, flange gaskets, insulators
Values per H-O product TDS and the Rogers / Silicone Engineering data on file. [21] [17] [18] Grade pages: 50 A FDA white, 60 A commercial, HT-1250, kSil GP50, kSil US40, kSil V-0 70, HT-6240 transparent, HT-6360 Fire-Safe.
Platinum-cured medical silicone: SSP2390, BISCO® MS-1600 / MS foams, Medical Grade sheetUSP Class VI and ISO 10993 tested grades · 10–80 Shore A · sterilization-compatible
Values per H-O product TDS. [11] Grade pages: Medical Grade sheet, SSP2390-40D, MS-1650, MS80.
Fluorosilicone (FVMQ): calendered sheet, Norseal® R10490 sponge, SSP 502F conductiveFuel and oil resistance · −80 to +400/450 °F per TDS · MIL-DTL-25988 class
Values per H-O product pages and the Saint-Gobain / SSP TDS on file. [38] [24] [37] Grade pages: FVMQ calendered sheet, R10490 sponge, SSP 502F-60.
Electrically conductive silicone: SSP 2569 / 2368 / 502 series, BISCO® EC-2130 / EC2265MIL-DTL-83528 Types A, B, C, D, K, M · Ni-graphite economy grades · EMI/RFI gaskets
Values per SSP, Rogers, and Parker Chomerics literature cited on this page; Note: H-O converts MIL-DTL-83528 QPL-listed materials and is not itself listed to the specification. [33] [35] [34] Grade pages: SSP 502-40, 502-40-V0, EC-2130, EC2265.
Thermally conductive silicone: Bergquist® Sil-Pad® and Gap Pad®, Rogers/Arlon PROTECT®0.9–5.0 W/m·K classes · dielectric · −60 to 200 °C per TDS
Values per Henkel Bergquist and Rogers/Arlon TDS. [32] [36] Category: Rogers / Arlon TIM pads and films. Grade pages: Sil-Pad TSP 900, Gap Pad TGP 3000, PROTECT 1500FG.
Specialty solid sheets: metal-detectable, low-outgassing, extreme high-temperature, extreme flame-retardant, fiberglass-reinforced, extreme low-temperatureFormulated for one requirement each · ElastaPro-branded specialty grades in the H-O catalog
Values per the H-O product TDS for each grade. [47] [30] [7] [41] Grade pages: Metal Detectable, Low Outgassing, Extreme High-Temperature, Extreme Flame Retardant, Fiberglass Reinforced, Extreme Low-Temperature.
Catalog index: where each silicone family is covered in this guide
Thirty silicone families across foam, sponge, solid sheet, conductive, thermal, and tape stock. Each row names the grades H-O converts, the guide section that explains the family, and the catalog page that carries the TDS. If a family you specify is missing, tell engineering and it will be added.
Show all 30 silicone families tap to collapse
| Family (catalog name) | Grades H-O converts | Form | Read in this guide | Catalog |
|---|---|---|---|---|
| Cellular silicone foam | ||||
| BISCO® HT / BF cellular silicone | BF-1000, BF-2000, HT-800, HT-820, HT-840, HT-870 | Cast foam sheet and roll | Foam vs sponge vs solid: foam · Material families | HT / BF series |
| BISCO® MF series industrial bun | MF1 Soft, Medium, Firm | Skived bun foam | Foam vs sponge vs solid: foam | MF series |
| BISCO® MS series medical cellular silicone | MS80, MS96 | Open-cell medical foam | Specialty: medical · Material families | MS series |
| BISCO® RF / IF / FPC specialty foam | RF-120 heat shield, IF-200 tear-resistant, FPC, L3-XX40 flooring | Reinforced and specialty foam | Specialty: fiberglass-reinforced · Specialty: flame-retardant | RF / IF / FPC |
| Closed-cell silicone sponge | ||||
| BISCO® RS series flame-retardant sponge | RS-870 Soft, RS-800 Medium, RS-820 Firm, RS-840 Very Firm | Sponge sheet, molded skin | Foam vs sponge vs solid: sponge · Material families | RS series |
| BISCO® 7xxx aerospace-specification sponge | 7130 Soft FR, 7304 Medium, 7330 Firm FR, 7430 Firm FR | Sponge sheet to BMS 1-60 / BMS 1-23 / DMS-1980 | Foam vs sponge vs solid: 7xxx table · Compression-set comparison | 7xxx series |
| kSil® V-0 flame-resistant sponge | KSV001 Super Soft through KSV006 Firm | Sponge sheet, UL 94 V-0, EN 45545-2 | Foam vs sponge vs solid: sponge · Specialty: flame-retardant | kSil V-0 |
| BISCO® A2 sound-barrier sponge | A2, A2 fiberglass-reinforced | Dense acoustic sponge | Material families: sponge | A2 sound barrier |
| Norseal® R10490 fluorosilicone sponge | R10490 (35 pcf, 15 psi) | Fuel- and oil-resistant sponge | Specialty: fluorosilicone | Fluorosilicone sponge |
| BISCO® EC-2130 conductive sponge | EC-2130 (30 A, <1 Ω·cm) | Electrically conductive sponge | Specialty: conductive | EC-2130 |
| Solid silicone sheet | ||||
| Commercial-grade solid silicone | 30, 40, 50, 60, 70, 80, 90 Shore A (black) | Calendered sheet, 1/32–1/2 in | Foam vs sponge vs solid: solid | Solid silicone |
| FDA-grade white | 30–80 Shore A | 21 CFR 177.2600 sheet | Specialty: food-contact | FDA white |
| FDA-grade translucent | 20–70 Shore A | 21 CFR 177.2600 sheet | Specialty: food-contact | FDA translucent |
| BISCO® HT-12xx general-purpose solid | HT-1240, HT-1250, HT-1260, HT-1270 | Solid sheet, 40–70 A | Foam vs sponge vs solid: solid · Compression set | HT-12xx |
| BISCO® HT-6xxx high-performance solid | HT-6135 tight tolerance, HT-6210 / 6220 soft, HT-6240 transparent, HT-6360 Fire-Safe | Solid sheet, specialty | Specialty: flame-retardant · Material families | HT-6xxx |
| kSil® GP general-purpose solid | GP30–GP80; GP200–GP530 | Calendered sheet | Foam vs sponge vs solid: solid · Specialty: high-temperature | kSil GP |
| kSil® US series (FDA, AMS 3301–3304) | US30, US40, US50, US60, US70; US350 / US400; kSil V-0 70 | Solid sheet with FDA and AMS callouts | Material families: solid | kSil US |
| SSP2390 platinum-cured medical | 2390-10D through 2390-80D | Compression-molded medical sheet | Specialty: medical · Cure systems | SSP2390 |
| BISCO® MS-1600 medical solid | MS-1630 through MS-1670 | Platinum-cured translucent sheet | Specialty: medical | MS-1600 |
| ElastaPro™ specialty solids | Metal-detectable, low-outgassing, extreme high-temperature, extreme low-temperature, extreme flame-retardant, fiberglass-reinforced, high-strength | Formulated for one requirement each | Metal-detectable silicone · Specialty silicones | ElastaPro grades |
| Fluorosilicone (FVMQ) calendered sheet | 40–80 Shore A, MIL-DTL-25988 / AMS 3323–3331 classes | Solid sheet | Specialty: fluorosilicone | FVMQ sheet |
| Electrically conductive silicone (EMI) | ||||
| SSP502 standard silicone EMI | 502-30 / 40 / 65 nickel-graphite; 2368, 2476, 2486, 2569, 2571, 2573 silver-filled QPL grades | Conductive sheet to MIL-DTL-83528 | Specialty: conductive · Material families | SSP502 standard |
| SSP502 flame-retardant (V-0) | 502-40-V0, 502-60-V0 | Conductive sheet, UL 94 V-0 | Specialty: conductive | SSP502 V-0 |
| SSP502 fluorosilicone-base | 482F-75, 502F-50 / 60 / 80 | Conductive FVMQ sheet | Specialty: fluorosilicone · Specialty: conductive | SSP502 FVMQ |
| SSP502 corrosion-resistant | 2529 (Ni/Al silicone), 2551 and 550-70 (Ni/Al fluorosilicone) | Conductive sheet for aluminum flanges | Specialty: conductive | Corrosion-resistant |
| BISCO® EC-2265 high-conductivity solid | EC-2265 | Conductive solid sheet | Specialty: conductive | EC-2265 |
| Thermally conductive silicone | ||||
| Bergquist® Sil-Pad® TSP | TSP 900, TSP 1600S, TSP 1800ST, TSP 3500, TSP K1300 | Reinforced silicone insulator pads | Specialty: thermal · Material families | Sil-Pad |
| Bergquist® Gap Pad® TGP | TGP 1000VOUS, TGP 1500, TGP 3000, TGP 5000 | Soft conformable gap fillers | Specialty: thermal | Gap Pad |
| Rogers / Arlon PROTECT® TIM pads | PROTECT 1500FG, 48A53R009 | Silicone / fiberglass thermal pads, UL 94 V-0 | Specialty: thermal | PROTECT |
| Rogers / Arlon Secure® TIM adhesive films | Secure 1500 KT2, 48A51R009 / R016, 99A50R007 / R008 / R009 | Thermally conductive silicone adhesive films | Specialty: thermal | Secure |
| Silicone tapes and adhesives | ||||
| Silicone / acrylic hybrid tapes | Polysil™ 1003 (medical, −100 to 500 °F), Polysil™ SA 1911, 2378SL | Differential tapes for bonding silicone | Adhesive-backed silicone | Hybrid tapes |
| Silicone splice and platers tape | Single grade, −60 to 350 °F | Silicone-adhesive tape | Adhesive-backed silicone | Splice tape |
Catalog family names and grade lists follow the H-O materials catalog at the time of writing; the catalog page governs when the two differ. Non-silicone stock that appears alongside these families (EPDM, neoprene incl. MIL-PRF-6855 Class 2, PU foam, PTFE, graphite, foil tapes) is covered in Silicone vs other elastomers.
Questions engineers ask about this topic
Direct answers with the source. The same questions appear in the page’s structured data.
Does H-O manufacture, mold, or extrude silicone?
No. H-O is a converter. Silicone manufacturers (Rogers BISCO®, Silicone Engineering, SSP, Saint-Gobain, Henkel Bergquist®, and specialty mills) compound, calender, cast, or mold the sheet and roll stock. H-O die-cuts, CNC-knife and waterjet-cuts, slits, laminates PSA and films, inspects, kits, and packages that stock into finished gaskets, pads, seals, and insulators in Winsted, CT, under an ISO 9001:2015 certified quality management system with APQP/PPAP support. Extruded profiles and molded parts are available through H-O’s partner network with their own tooling lead times.
What is the lead time for die-cut silicone gaskets?
Samples typically ship in 3–5 business days for common die-cut configurations on materials H-O commonly converts; standard production runs ship about 2 weeks after drawing approval, with expedited service available. Specialty grades sourced to order, and extruded or molded parts through the partner network, run their own lead times. MOQ varies by material and part; prototype quantities and full production runs are equally accepted.
What types of silicone rubber are there?
Two ways to sort them. By form: solid silicone sheet (rated by Shore A durometer), closed-cell silicone sponge and cast silicone foam (both rated by compression force deflection). By chemistry: VMQ (general purpose methyl-vinyl), PVMQ (phenyl, for cold below −60 °C), FVMQ (fluorosilicone, for fuel and oil), and filled VMQ (silver or nickel-graphite for EMI, ceramic for thermal pads, flame packages for UL 94 V-0, ferrous additive for metal detection). Regulatory grades (FDA 21 CFR 177.2600, USP Class VI / ISO 10993) are specific tested formulations, not a separate chemistry. [11] [21]
Which form of silicone should I choose for a gasket?
Match the form to the closure force the joint can supply. A latch-closed lid or plastic housing that can develop only a few psi takes cast silicone foam (1–7 psi at 25% deflection, 2–5% compression set). A stiff sheet-metal door with several fasteners takes closed-cell sponge (roughly 5–20 psi, molded skin). A bolted flange or a pressurized fluid joint takes solid sheet, designed at 10–30% deflection. Then choose the grade for temperature, flame, fluid or regulatory requirements. [14] [16]
How do I read a silicone data sheet?
Start with the test method next to each value, because the number means nothing without it: durometer (ASTM D2240), CFD at 25% (ASTM D1056), compression set with deflection, temperature and time (D1056 or D395), tensile and elongation (D412), tear with the die letter (D624), dielectric strength at the tested thickness (D149), and outgassing (E595). Separate “typical” from “specification range” values and design to the range. Check whether the temperature is a continuous or intermittent rating, and whether UL 94, FDA or AMS callouts apply to the color and thickness you are buying. [4]
What silicone materials does H-O convert?
Cast silicone foam (Rogers BISCO® HT/BF, MF1 bun, RF-120, IF-200, FPC), closed-cell sponge (BISCO RS and 7xxx, Silicone Engineering kSil® V-0, Saint-Gobain Norseal® including R10490 fluorosilicone sponge), solid sheet (commercial and FDA grades 20–90 Shore A, BISCO HT-1200 and HT-6000, kSil GP and US), platinum-cured medical grades (SSP2390, BISCO MS-1600, Medical Grade sheet), conductive silicone (SSP 2569/2368/502 series, BISCO EC-2130), Bergquist® Sil-Pad® and Gap Pad® thermal pads, and specialty sheets (metal-detectable, low-outgassing, extreme high-temperature, flame-retardant, fiberglass-reinforced, low-temperature). All are converted to order from sheet or roll stock.
References
Every quantitative claim on this page traces to one of the sources below. Reference numbers are shared across all eight pages of the Silicone Materials guide so a value cited as [4] here is the same source as [4] on any other page. Values change between data-sheet revisions; the revision on file at publication governs.
Show all 33 sources cited on this page tap to expand
SSP: A-A-59588 / ZZ-R-765 silicone classes
Specialty Silicone Products, “A-A-59588 Silicones”: ZZ-R-765 replaced by CID A-A-59588 in 2001; Class 1 (low temperature, phenyl), Class 2 (high-temperature resistant; 2B adds low compression set), Class 3 (tear and flex resistant); grades by durometer; representative SSP grade properties. sspinc.com/a-a-59588-silicones
Avery Dennison: surface energy and adhesive choice
Surface-energy classes: metals 700–1,100 mJ/m², glass 100–300, engineering polymers 35–50, hydrocarbon/fluorocarbon/silicone polymers 18–40 mJ/m². averydennison.com
ASTM D1149 / D1171
Standard Test Methods for Rubber Deterioration: Cracking in an Ozone Controlled Environment (D1149) and Surface Ozone Cracking Outdoors (D1171). astm.org/d1149 ASTM D1171: store.astm.org/d1171
Rogers BISCO® HT-800 data sheet (Pub. 180-070)
Density 22 pcf; CFD 6–14 psi (9.7 typ.); compression set 2.4% typ.; −55 to +200 °C; ASTM D746 −55 °C; UL 94 V-0/HF-1 file E83967; 75 V/mil; 10¹⁴ Ω·cm; 0.076 W/m·K; TML 0.98% / CVCM 0.25%; AMS 3195; FDA 21 CFR 177.2600 extractives (gray). rogerscorp.com (PDF) · H-O product page
Rogers Technical Sealing Guide (PORON® and BISCO®)
Stress relaxation mostly in first 1–2 h; silicone/PORON retain 45–75% of force at 60 h vs 15–35% for EPDM/neoprene; compression-set comparison at 70 °C and 100 °C (D3574 basis); water leakage vs width and compression at 1.5 psi; NEMA/IP mapping; UL 50E gasket test levels. rogerscorp.com (PDF)
Shin-Etsu silicone rubber performance data
Oil-swell comparison: general silicone +26–30% volume in IRM 903 (150 °C/70 h) vs fluorosilicone under 5%; fluorosilicone in Fuel C about +4%; compression-set and heat-aging ranges by grade. shinetsusilicone-global.com (PDF)
H-O TDS: Extreme High-Temperature Grade Silicone Sheeting
55/60 Shore A; 1,050/1,200 psi; 450%; heat aging 168 h at 300 °C: retained tensile >750 psi, elongation >90%, tear >70 ppi. H-O product page · TDS (PDF)
Rogers BISCO® silicones family overview
Grade ladder (BF-2000 10–11 pcf, BF-1000 12 pcf, HT-870 15 pcf 2–7 psi, HT-800 22 pcf, HT-820 24 pcf, HT-840 28 pcf), MF1 bun to 8 in, IF-200, RF-120 (BF-1000 foam on aluminized fabric), FPC, RS-700 sponge, HT-1200 and HT-6000 solids, EC-2130 / EC2265, MS medical series. rogerscorp.com
Rogers: “Everything You Need to Know About Compression Set” (2024)
ASTM D1056 vs D3574 conditions and formulas (2% D1056 ≈ 1% D3574); under 5% “excellent for long-term sealing”; HT-800 about 2%, “rebounds to 99% of original height”; compression set vs stress relaxation. rogerscorp.com
BISCO® RS-700 series sponge data (Rogers via Insul-Fab)
RS-720 17.5 pcf 5–12 psi; RS-750 24 pcf 6–14 psi; RS-770 29 pcf 12–20 psi; compression set 15–20% max (D1056, 100 °C/22 h); −55 to 205 °C; UL 50/50E/508 recognized. insulfab.net (verify against the current Rogers TDS before publication)
H-O TDS: Medical Grade Silicone Sheeting
30–70 Shore A; tensile 1,100–1,350 psi; elongation 600–900%; tear 170–205 ppi (Die B); USP Class VI, European Pharmacopeia, ISO 10993, FDA 21 CFR 177.2600. H-O product page · TDS (PDF)
UL 94, Standard for Tests for Flammability of Plastic Materials
HB, V-2, V-1, V-0, 5VA/5VB and foam classes HBF/HF-1/HF-2; V-0 afterflame ≤10 s per specimen, ≤50 s per set, no flaming drips igniting cotton. ul.com
ASTM E595 and NASA outgassing criteria
125 °C, 24 h, vacuum, 25 °C collector; screening pass TML ≤1.0% and CVCM ≤0.10%. NASA GSFC outgassing database
Rogers: “The Ultimate Guide to Compression Force Deflection” (2024)
CFD per ASTM D1056 at 25%; 25–35% minimum compression recommended; 50–70% permissible but may crush cells; CFD curves at 10/30/50/70%. rogerscorp.com
H-O product pages: kSil® V-0 KSV001 and KSV004 sponge
KSV001 V-0 Super Soft: 10.0 pcf, 2.8 psi at 25%, UL 94 V-0, −76 to 446 °F. KSV004 Medium: 24.3 pcf, 9.0 psi at 25%. KSV001 · KSV004 · manufacturer: silicone.co.uk
NEDC: compression rates in rubber gaskets
Solid gaskets 10–30% (air 10–15%, water 20–30%); foam and sponge 30–50% (air 25–35%, water 40–50%). nedc.com
Rogers BISCO® HT-1200 series data sheet (Pub. 180-068)
HT-1240/1250/1260/1270: 40–70 Shore A; compression set ≤25% (ASTM D395, 150 °C/70 h); −68 to 218 °C (−80 to 425 °F); 0.031–0.125 in. rogerscorp.com (PDF)
kSil® GP solid sheet TDS (Silicone Engineering, SE-NEU-V7-2019) and H-O GP50 page
GP30–GP80: tensile 7–10 MPa, elongation 215–525%, tear 16–23 N/mm, compression set 9–25% (ISO 815, 24 h/150 °C) and 10–22% (ASTM D395 B, 22 h/300 °F); −60 to 230 °C (250 °C intermittent); 0.24 W/m·K; 23 kV/mm; 3×10¹⁵ Ω·cm; FDA 21 CFR 177.2600, BfR XV, WRAS, FAR 25.853. TDS (PDF, distributor-hosted) · silicone.co.uk/ksil · H-O GP50 page
H-O TDS: 50 Durometer FDA Grade Solid Silicone
SG 1.33; 50 ±5 Shore A; 950 psi; 600%; tear 105 ppi; −80 to 450 °F; FDA 21 CFR 177.2600; 1/32–1/2 in white. H-O product page
H-O product page: Norseal® R10490 fluorosilicone sponge
35 pcf; CFD 15 psi; −80 to 400 °F; AMS 3323, MIL-R-6130; 0.031–0.125 in blue. H-O product page · TDS (PDF)
H-O TDS: Low Outgassing Silicone Sheeting
40–70 Shore A; 1,100–1,250 psi; 650–900%; tear 175–200 ppi; TML ≤1.00%, CVCM ≤0.10% (ASTM E595); NASA-STD-6016; FDA 21 CFR 177.2600. H-O product page · TDS (PDF)
Rogers BISCO® HT-6000 series and HT-6240 data sheet (Pub. 180-093)
HT-6240 Transparent: 40 ±5 Shore A; 1,040 psi; 325%; 112 ppi; SG 1.07; 386 V/mil; −55 to +200 °C. HT-6360 Fire-Safe: 60 A; UL 94 V-0; ASTM E162/E662. rogerscorp.com
Henkel Bergquist® Sil-Pad® TSP 900 TDS
0.9 W/m·K; 85 Shore A; 3,500–4,500 Vac; 0.007–0.009 in; −60 to 180 °C; thermal impedance 1.13 °C·in²/W at 50 psi; UL 94 V-0. henkel.com (PDF)
SSP: MIL-DTL-83528 QPL conductive elastomers
Type map (A: SSP2569-65 Ag/Cu; B: SSP2368-65 Ag/Al; C: SSP2573-75; D: SSP2486-70; K: SSP2571-85); SSP page values: Type A (SSP2569-65) 0.004 Ω·cm and 110 dB; Type B 0.008 Ω·cm, 100 dB; Type D 0.012 Ω·cm, 90 dB; Type K 110 dB (20 MHz–10 GHz). sspinc.com
Parker Chomerics elastomer selector guide
CHO-SEAL® 1215 (Ag/Cu silicone) 0.004 Ω·cm max; 1285 (Ag/Al) 0.008; 1287 (Ag/Al FVMQ) 0.012; 6502 (Ni/Al) 0.150; temperature ranges by grade. Used as industry cross-reference only. parker.com (PDF)
Rogers BISCO® EC-2130 data sheet (Pub. 180-034)
Nickel-graphite; volume resistivity under 1.00 Ω·cm; SE 105/108/108/103 dB at 100 MHz/600 MHz/1 GHz/10 GHz; 30 ±5 Shore A; compression set 10% max (D395 B, 70 °C/70 h/25%); −62 to +200 °C. rogerscorp.com (PDF)
Henkel Bergquist® Gap Pad® TGP 3000 and TGP 5000 TDS
TGP 3000: 3.0 W/m·K, Shore OO 30, 3,000 Vac, 0.254–3.175 mm, −60 to 200 °C, 3.2 g/cm³, UL 94 V-0. TGP 5000: 5.0 W/m·K, Shore OO 35, 5,000 Vac, 3.6 g/cm³. henkel-adhesives.com (TGP 3000) · TGP 5000
SSP: Understanding MIL-DTL-25988 fluorosilicone
Types I–IV (Type II sheet/roll), Classes 1–4, Grades 40–80 Shore A; continuous −55 to +175 °C, short-term to +200 °C. sspinc.com
H-O product page: Fluorosilicone (FVMQ) Calendered Sheet
40 Shore A; SG 1.41; 1,200 psi; 600%; Fuel B swell 17%; −80 to 450 °F. H-O product page
H-O TDS: Fiberglass Reinforced Silicone Sheeting
70 ±10 Shore A; 0.014 in fiberglass ply, 12.5 oz/yd²; 1,300 psi min combined tensile; compression set 35% max; AMS 3320, AMS 3315; FDA 21 CFR 177.2600 ingredients. H-O product page · TDS (PDF)
H-O TDS: Metal Detectable Grade Silicone Sheeting
40/50/60/85 Shore A; SG 1.29–1.56; tensile 1,050–1,250 psi; elongation 100–800%; tear 100–190 ppi; magnet pull test 4 kg max (20.5 mm magnet); FDA 21 CFR 177.2600; −85 to +525 °F intermittent; 0.010–0.500 in. H-O product page · TDS (PDF)
Parker O-Ring Handbook (ORD 5700): elastomer temperature ranges
Silicone −115 to 232 °C (special compounds); fluorosilicone −73 to 177 °C; EPDM −57 to 150 °C (to 204 °C in water/steam); nitrile −34 to 100 °C (121 °C with shorter life); FKM −26 to 205 °C; neoprene (CR) −40 to 121 °C; polyurethane −40 to 82 °C. parker.com (PDF)
BISCO® 7xxx series sponge TDS (Rogers, hosted on H-O product pages)
7130 Soft FR: 31 pcf, CFD 2–7 psi at 25%, C-set 35% (22 h at 212 °F), −67 to 400 °F, UL 94 HBF, BMS 1-60 Type 1 Grade A and DMS-1980 Grade 1 per the Rogers TDS. 7304 Medium: 35 pcf, 6–14 psi, C-set 20%, −67 to 450 °F, BMS 1-23, red. 7330 Firm FR: 35 pcf, 7–14 psi, C-set 35%, −67 to 450 °F, BMS 1-60 Type 1 Grade B, DMS-1980 Grade 2; 0.313–1.00 in. 7430 Firm FR: 35 pcf, 14–22 psi, C-set 35%, −67 to 400 °F, BMS 1-60 Type 1 Grade C; 0.188–0.500 in. Water absorption under 5%; UV and ozone resistant. 7130 · 7304 · 7330 · 7430 (Rogers TDS PDFs on each page; confirm current revision with Rogers before publication)
Need help selecting a silicone?
Send H-O your drawing, operating temperature, environment, compression requirements, regulatory requirements, adhesive needs, and expected quantity. Our team reviews the application against current manufacturer data and helps identify appropriate material constructions for prototyping and production. We typically respond within one business day.
See also: the rest of the Silicone Materials guide
The guide is one hub and seven topic pages that share one set of sources and one set of numbers.
Silicone materials guideFoam vs sponge vs solidHow cast silicone foam, closed-cell silicone sponge and solid silicone sheet differ in structure, CFD, compression set, sealing and mechanical behavior, with grade data from Rogers, Silicone Engineering and Saint-Gobain.Read the guide
Silicone materials guideProperties: CFD & compression setCompression force deflection vs compression set for silicone gaskets: test methods, formulas, a 14-material benchmark, a worked closure-force example, and 18 engineering properties explained by how they are used.Read the guide
Silicone materials guideMetal-detectable siliconeMetal-detectable silicone rubber explained: why it exists, how in-line detection works, Silicone Engineering metectSil grades and test conditions, the H-O 40–85 Shore A detectable grade, solid vs sponge, FDA compliance, and converted gasket options.Read the guide
Silicone materials guideSpecialty silicones & cure systemsFourteen specialty silicone families and the cure systems behind them: high-temperature, flame-retardant, low-outgassing, insulating, conductive, thermally conductive, fluorosilicone, medical, food-contact, antimicrobial, reinforced, high-tear, translucent and membrane grades, with what to evaluate and the design risk for each.Read the guide
Silicone materials guideAdhesive-backed siliconeHow to put pressure-sensitive adhesive on silicone foam, sponge and solid gaskets: why acrylic fails on silicone, silicone PSA vs differential tape, peel and temperature data from 3M and Rogers, shelf life, and the mounting-aid rule.Read the guide
Silicone materials guideSilicone vs other elastomersAn honest comparison of silicone with EPDM, nitrile, FKM, neoprene, cellular urethane and natural rubber: temperature ranges, where each beats silicone, cost tiers, and the eleven most common silicone selection mistakes.Read the guideMaterial categorySilicone foam and sponge catalogBISCO® HT/BF, MF1, RS and 7xxx sponge, kSil® V-0, fluorosilicone sponge.Read the guideMaterial categorySolid silicone rubber catalogCommercial, FDA, medical, HT-1200, kSil® GP/US and specialty sheets by durometer.Read the guide