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How to Spec Fire-Barrier, Isolation, and Rack EMI Parts: What to Send H-O for a Quote
Safety-side parts are specified once and trusted for years, which makes the RFQ the highest-leverage five minutes in the whole program. The failure modes are quiet (a barrier stack missing its FST layer, a pad crushed solid under a genset, an EMI gasket corroding into an insulator), and every one of them traces back to a number that was not on the drawing.
This article is the checklist the H-O applications team works from for the four zones of the parent application page: fire barriers, isolation pads, fuel and acoustic treatments, and rack EMI, with what to send, what it decides, and what happens after you hit send.
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What to send, zone by zone
| Zone | Send this | What it decides |
|---|---|---|
| Cable-tray fire barriers | Wall schedule and tray sizes; opening and bundle dimensions; the full materials clause (flame class AND any smoke/toxicity indices); wall exposure temperature where known | The stack per penetration: ManniGlas or mica as the inorganic layer, kSil V-0 (kSil V-0 70 page) or RS-series sponge as the rated seal, FST neoprene where indices are specified. Assembly design stays with the facility fire engineer per NFPA 75 / NFPA 76. |
| Isolation pads | Supported wet mass, pad footprint, and layout per machine; what sits on each pad (genset, transformer, switchgear, drives) | The family and density by bearing pressure: rebonded neoprene 25#/27# for heavy plant, ENSOLITE vinyl nitrile / SBE grades at lighter loads, landed in the working range per ASTM D1056 data. |
| Fuel & acoustic treatments | Fuel-exposure mode per gasket (mist, splash, immersion); acoustic coverage areas and penetration cutouts | Epichlorohydrin C41ECH on the fuel-wetted joints with standard foams kept dry-side; BISCO A2 sound barrier (reinforced variant for spans and curtains) cut to the panels, with targets staying with the facility acoustician. |
| Rack EMI set | Joint inventory (doors, panels, seams); closure force and flange flatness; mating-surface plating; room environment; any flame class on gasket materials | Solid SSP-series grades on engineered joints (with V-0 grades where the flame class applies and corrosion-resistant grades with ASTM B117 data for harsher rooms), EC-2130 conductive sponge where flatness or hinge force runs out, and conductive foil tape on seams. Electrical references: MIL-DTL-83528, ASTM D991 per TDS. |
What engineering does with the list
The review runs by protection function. Barrier penetrations get a per-wall stack with each layer's grade and thickness and the citation language written the way reviews expect (ratings per grade TDS; NFPA 75 / NFPA 76 by designation; assembly design owned by the facility). Pads get a bearing-pressure check: mass over footprint against the grade's compression-deflection data, machine by machine. Fuel-side gaskets get the exposure-mode sort, and acoustic blankets get cut plans with airtight cutout detailing.
EMI joints get the three-way split (solid, sponge, tape) by joint mechanics, with the filler system matched to the named plating. The output is a family and grade direction per part, the documentation plan, and a quote.
What happens after you send it
- Drawing review. Typically opened the same business day; the response is either a material direction per zone or the specific missing numbers (the materials clause, the masses, and the plating are the usual three).
- Material direction and quote. Families and grades with TDS citations: UL 94 listings at your thickness, D1056 compression data for the pads, MIL-DTL-83528-referenced electricals for the EMI set.
- Samples. Typically 3 to 5 business days for common die-cut configurations on materials we keep on hand.
- Production. Standard production runs about two weeks after drawing approval, including kiss-cut-on-liner and laminated configurations; expedited service available. MOQ varies by material and part.
Documentation available on request: material TDS, certificate of conformance, and lot traceability, under our ISO 9001:2015 certified quality management system. H-O is a die-cut converter in Winsted, Connecticut: we convert the materials and supply their documentation; we do not certify assemblies, and we do not mold or extrude in-house (profiles are coordinated through our partner network).
The mistakes this checklist prevents
| Spec mistake | What it causes | Checklist line that catches it |
|---|---|---|
| A V-0 foam standing in for a barrier stack | A penetration with a rating but no barrier function | The stack callout, layer by layer |
| Indices discovered after installation | Penetration rework at commissioning prices | The full materials clause |
| Pads picked by footprint | A crushed-solid pad transmitting genset vibration into the white space | Mass and footprint per machine |
| Standard foam in the fuel drip zone | A gasket swelling out of its groove on a day-tank cover | Fuel-exposure mode per gasket |
| EMI filler chosen without the plating | Galvanic corrosion turning the joint into an insulator; emissions quietly return | Mating-surface plating line |
| Unrated conductive gasket where V-0 applies | A flame-class finding on the EMI joint at inspection | Flame class on gasket materials |
Frequently asked questions
Can the safety-side material set standardize across several sites?
Yes, and it should. The protection functions repeat site to site even when room geometry does not: the same barrier stack at penetrations (sized per wall), the same two isolation families split by bearing pressure, the same fuel-side gasket chemistry, the same acoustic barrier sheet, and the same three-part rack EMI set. A drawing package standardized on these families turns each new site into a dimensions problem instead of a materials problem. Send the package for a standing review.
What exactly should the EMI joint inventory include?
Per joint: the type (hinged door, bolted panel, fixed seam), the closure force the hardware actually delivers, the flange flatness or waviness, the mating-surface plating, and the room environment (humidity, plant-adjacent exposure). Those five facts split the set between solid SSP-series grades, EC-2130 conductive sponge, and foil tape, and they pick the filler system against the plating so the joint stays conductive over the years.
Do you need the acoustic targets to quote the sound-barrier parts?
No. Acoustic design targets stay with the facility acoustician; what the quote needs is the coverage areas, the panel dimensions, and the penetration cutouts, because the barrier works as added limp mass on the panel and the field result depends on coverage and airtight cutouts. Send the panel drawings and the blanket set comes back as die-cut parts with the reinforced variant where the sheet spans framing or hangs as a curtain.
How should the flame and FST requirements be written on the drawing?
Quote the facility clause verbatim and attach it to the material callouts: "seal materials UL 94 V-0 per facility spec section X" and, where indices apply, "FST indices per facility spec section X." The listings are per grade and per thickness on each TDS, so the review verifies them at your gauge. The expensive alternative is the one-line note that was never written, discovered at commissioning.
Send the zone checklist, get a safety-side quote
Attach the wall schedule, room layout, joint inventory, and the materials clause. Drawing review typically starts the same business day.
Samples typically 3 to 5 business days; production about two weeks; MOQ varies by material and part. Expedited service available.
Family-owned in Winsted, Connecticut since 1971 · ISO 9001:2015 certified · OEMs worldwide send us a drawing — and get back their part.
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Send H-O your drawing or describe the part—engineering reviews every RFQ and converts samples on your geometry.
Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
References
- UL 94 (V-0 / HF-1 listings per grade and thickness); NFPA 75 and NFPA 76 (facility-level fire-protection framing, by designation); ASTM C177 (glass-fiber paper thermal data).
- ASTM D1056 (compression-deflection for pads and sponges); MIL-DTL-83528 (conductive-elastomer reference specification); ASTM D991 (volume resistivity); ASTM B117 (salt spray, corrosion-resistant EMI grades).
- Maker technical data sheets: ManniGlas papers; mica barrier sheets; kSil V-0 / RS-series sponge; FST neoprene; rebonded neoprene; ENSOLITE / SBE vinyl nitrile; C41ECH; BISCO A2 and EC-2130; SSP-series family; conductive foil tapes.
This checklist supports a quotation workflow; it does not constitute design guidance for any specific facility. Ratings and indices are per-grade, per-thickness TDS listings; assembly and penetration design belong to the facility fire engineer and the AHJ, acoustic targets to the facility acoustician, and shielding results to the assembled joint. H-O converts materials and supplies their documentation; it does not certify assemblies.
All parts are custom manufactured to order; minimum production run quantities vary by material and part. H-O is a die-cut converter, not a raw-material producer.