Flame Retardant Silicone Gaskets
Manufacturer & Custom Solutions
Flame Retardant Silicone Gaskets
Our flame-retardant silicone gaskets meet UL 94 V-0 and other fire-safety standards. They self-extinguish and produce low smoke, protecting people and equipment. Used in mass transit, aerospace and electrical cabinets.
FDA 21 CFR 177.2600
Rubber Articles Intended for Repeated Use
LFGB 30&31
EU Food Contact Materials
USP Class VI / ISO 10993
Biocompatibility of Medical Devices
RoHS / REACH
Environmental Compliance
UL 94
Flammability of Plastic Materials
Built to Your Exact Spec
Custom Silicone Gaskets Options
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
 | DIN 32676 Silicone Gasket | Standard & Size | DIN 32676 tri-clamp silicone gaskets, FDA food grade, full size range in stock at ZSR factory. | View Details |
 | AS568 Standard Silicone Gaskets | Standard & Size | AS568 standard-size silicone gaskets for groove-based sealing applications. | View Details |
 | DIN 3869 Silicone Sealing Ring | Standard & Size | DIN 3869 profile sealing rings in silicone for hydraulic ports, working from -60°C to +200°C. | View Details |
 | EN 1514-1 Silicone Gasket | Standard & Size | EN 1514-1 silicone flat gaskets for PN flanges, IBC and FF types, standard and custom sizes. | View Details |
 | Custom Die Cut Silicone Gaskets | Standard & Size | Flat silicone gaskets cut to any shape from sheet stock. Precision cutting for exact fits. | View Details |
 | ISO 7483 Silicone Gasket | Standard & Size | Silicone gaskets to ISO 7483 for ISO 7005 flanges, made for international projects and tenders. | View Details |
 | Custom Molded Silicone Gaskets | Standard & Size | Three-dimensional silicone gaskets made by compression or injection molding. For complex sealing shapes. | View Details |
 | ISO 1127 Silicone Gasket | Standard & Size | Sanitary silicone gaskets matched to ISO 1127 stainless steel tube sizes for food and pharma lines. | View Details |
 | Standard Flange Silicone Gaskets | Standard & Size | Silicone gaskets cut to fit pipe flanges. Matches ANSI, DIN and JIS bolt patterns. | View Details |
 | B16.21 Silicone Gasket | Standard & Size | ZSR makes silicone gaskets to ASME B16.21, ring type and full face type, for Class 150 to 2500 pipe flanges. | View Details |
 | ISO 2852 Silicone Gasket | Standard & Size | ISO 2852 silicone clamp gaskets for food industry couplings, FDA grade, factory direct from ZSR. | View Details |
 | Tri-Clamp / Sanitary Silicone Gaskets | Standard & Size | Hygienic silicone gaskets for food and pharmaceutical pipe connections. CIP and SIP compatible. | View Details |
 | B16.5 Silicone Gasket | Standard & Size | Silicone gaskets from ZSR sized to fit ASME B16.5 flanges, NPS 1/2 to 24 inch, Class 150 to 2500. | View Details |
 | Metric Size Silicone Gaskets | Standard & Size | Metric dimension silicone gaskets for international equipment standards. | View Details |
 | DIN 7603 Silicone Sealing Ring | Standard & Size | Flat silicone sealing rings made to DIN 7603 for screw plugs, banjo bolts and threaded fittings. | View Details |
 | DIN 2690 Silicone Gasket | Standard & Size | Silicone flat gaskets to DIN 2690 / EN 1514-1 dimensions for PN6 to PN40 flanges, food grade available. | View Details |
 | DIN 2691 Silicone Gasket | Standard & Size | Silicone gaskets made to DIN 2691 for tongue and groove flanges PN10 to PN160, ideal for plant repair. | View Details |
 | DIN 11851 Silicone Gasket | Standard & Size | Food grade silicone gaskets for DIN 11851 sanitary unions, DN10 to DN150, FDA material. | View Details |
 | FDA Food Grade Silicone Gasket | Grade | Food-safe silicone gaskets for processing equipment. FDA-compliant and taste-neutral. | View Details |
 | Medical Grade Silicone Gasket | Grade | Biocompatible silicone gaskets for medical devices. Sterilizable with full documentation. | View Details |
 | Industrial Grade Silicone Gasket | Grade | General-purpose silicone gaskets for industrial sealing. Reliable, durable and cost-effective. | View Details |
 | High Temperature / Heat Resistant Silicone Gaskets | Special Function | Heat-resistant silicone gaskets rated for continuous use above 200°C. For ovens and furnaces. | View Details |
 | Flame Retardant Silicone Gaskets | Special Function | Self-extinguishing silicone gaskets meeting UL 94 V-0. For fire-safety applications. | View Details |
 | Solid Silicone Rubber Gaskets | Materials | Solid silicone rubber gaskets with excellent compression set resistance and long service life. | View Details |
 | Fluorosilicone (FVMQ) Gaskets | Materials | Fuel and solvent-resistant silicone gaskets for chemical processing and automotive applications. | View Details |
 | Transparent / Clear Silicone Gaskets | Color | Clear silicone gaskets for visible sealing and light-transmitting applications. | View Details |
 | Black / White Silicone Gaskets | Color | Standard black and white silicone gaskets. Fastest delivery from stock. | View Details |
Flame Retardant Ratings and Standards
UL 94 is the most widely used flammability rating for rubber and plastic parts. It measures how a material behaves when a small flame touches it — and, most importantly, what happens after the flame is removed. The ratings form a clear ladder:
Rating | Test Type | Requirement | What It Means |
|---|---|---|---|
HB | Horizontal burn | Burns slower than the set limit, or stops before the 100 mm mark | Slow burning — the lowest level |
V-2 | Vertical burn | Stops burning within 30 seconds; flaming drips allowed | Self-extinguishing, but drips can spread fire |
V-1 | Vertical burn | Stops burning within 30 seconds; no flaming drips | Self-extinguishing, no drip risk |
V-0 | Vertical burn | Stops burning within 10 seconds; no flaming drips | The strictest common level — required for most electrical and safety parts |
Two things buyers should know
ratings are thickness-dependent — a material can be V-0 at 3 mm but only V-1 at 1.5 mm, so always match the rating to your real gasket thickness. And beyond UL 94, many industries have their own fire standards: EN 45545 for railway vehicles, FAR 25.853 for aircraft interiors, and automotive OEM specifications.
At ZSR Silicone Parts, we formulate flame retardant silicone compounds to meet UL 94 V-0 and can work toward specific industry standards on request — tell us the standard and the thickness, and we will confirm the right compound before production.
Flame Retardant vs Standard Silicone
Property | Flame Retardant Silicone | Standard Silicone |
|---|---|---|
Fire Behavior | Self-extinguishing — stops burning when the flame is removed | Will keep burning once ignited |
Smoke Generation | Low smoke | Moderate smoke |
Toxicity When Burning | Low — halogen-free, no toxic halogen gases | Low — silicone naturally burns clean (leaves silica ash) |
Typical Color | Usually gray or black (additives limit color choice) | Any color, including translucent |
Elasticity | Slightly reduced by the mineral additives | Full flexibility |
Temperature Range | -60°C to +200°C | -60°C to +230°C |
Cost | Higher (special formulation) | Base level |
An honest note
Flame retardant additives are mineral fillers, and they slightly reduce elasticity and tear strength compared with standard silicone. For most gasket jobs this makes no practical difference — but if your design needs maximum flexibility, tell us, and we will balance the formula.
The good news on smoke: silicone already burns cleaner than most rubbers — it produces no halogen gases and leaves a non-conductive silica ash. Our halogen-free flame retardant formula keeps that advantage while adding true self-extinguishing behavior.
Best Applications
Flame retardant silicone gaskets are specified wherever a seal sits close to electricity, fuel, or people:
Electrical enclosures and junction boxes
seals that must not feed a fault fire
Aerospace interiors
cabin and avionics seals meeting FAR 25.853
Appliances and lighting
anywhere a gasket sits near heaters, drivers, or ballasts
Mass transit vehicles
train, subway, and bus interior seals meeting EN 45545
Building construction
fire-rated door seals, curtain wall gaskets, HVAC fire damper seals
Industrial control panels
PLC cabinets, switchgear, and outdoor electrical cabinets
Battery packs and EV components
pack enclosures and module seals where thermal events must not spread
What Is Flame Retardant Silicone?
Flame retardant silicone is a specially formulated silicone rubber that refuses to keep burning. Standard silicone is a good material, but once ignited it will burn. Flame retardant silicone changes that behavior: special halogen-free additives are blended into the compound, and when the flame is removed, the material extinguishes itself — within seconds. The base is still true silicone, so the gasket keeps the temperature range, the weather resistance, and the flexibility silicone is known for. It simply adds one more layer of safety: when fire comes, it does not help the fire spread.
Key Properties of Flame Retardant Silicone
At ZSR Silicone Parts, LSR production follows a precise, automated process:
