High Temperature / Heat Resistant Silicone Gaskets
Manufacturer & Custom Solutions
High Temperature / Heat Resistant Silicone Gaskets
High-temperature silicone gaskets from ZSR Silicone stay elastic at 250°C and above. We offer VMQ, FVMQ and fiberglass-reinforced grades for different heat and chemical combinations. Send us your operating conditions and we recommend the right material.
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 |
Temperature Rating Comparison
Not all silicone gaskets handle heat the same way. The difference is in the formula — standard compounds versus compounds with heat stabilizers:
Grade | Continuous Service | Short-Term Peak | Typical Color / Marker |
|---|---|---|---|
Standard VMQ | -60°C to +200°C | +230°C | Translucent, red, white |
High-Temp VMQ (heat-stabilized) | up to +230°C | +250 – 300°C | Usually red or iron-oxide colored |
Extreme High-Temp VMQ (iron oxide / cerium stabilized) | up to +260°C | +315°C | Red-brown, dark red |
Continuous vs. short-term peak — the difference that decides gasket life.
Continuous means the temperature the gasket can hold for thousands of hours, for its whole service life, without losing hardness, strength, or sealing force. Short-term peak means a brief spike the gasket can survive and recover from — minutes to a few days, not months. A gasket held at its peak temperature permanently will slowly harden, shrink, and lose its seal. When you tell us your application, give us both numbers: the normal working temperature and the highest spike it will ever see. We will match the grade to both.
Hardness Selection for High Heat
Heat changes how a gasket behaves — and hardness is your first design tool to control it:
Silicone softens when it gets hot. A 40 Shore A gasket at 200°C behaves more like a 30 Shore A gasket. Under bolt load, a soft gasket at high temperature can squeeze out of the joint or take a permanent set much faster. That is why we recommend harder grades — 60 to 80 Shore A — for long-term hot applications. The extra hardness gives the gasket the body it needs to hold its shape and its sealing force when the temperature climbs.
Watch for the opposite long-term effect too. Over months of heat aging, silicone slowly hardens and gets less elastic — this is the normal aging path, and heat-stabilized grades slow it down. Starting with a slightly harder, heat-stabilized grade gives you the longest service life in hot service.
Our practical recommendations:
Tell us your temperature, bolt load, and flange surface — we will confirm the hardness for free before you order.
Common High-Temp Applications
Our heat resistant silicone gaskets work wherever seals face serious heat:
Industrial ovens and dryers
door seals, panel gaskets, and duct flanges (including self-cleaning oven cycles)
Automotive exhaust and engine bay
heat shields, EGR components, sensor gaskets near hot zones
Appliances
ovens, steamers, fryers, and commercial kitchen equipment
Lighting fixtures
high-power LED, stage, and industrial lighting where drivers and housings run hot
Furnaces and heat treatment equipment
access doors, observation ports, burner housings
Aerospace engines and APU compartments
seals that face extreme heat plus extreme cold at altitude
Semiconductor equipment
ovens, diffusion furnaces, and thermal process chambers
For the hottest oven and furnace door applications, also see our silicone sponge gaskets — the air cells inside add insulation and seal with very low closure force.
What Is High Temperature / Heat Resistant Silicone?
High temperature silicone is a specially formulated silicone rubber made to keep working where ordinary rubber — and even standard silicone — gives up. Its secret is in the recipe: heat stabilizers such as iron oxide and cerium compounds are blended into the silicone compound. These additives intercept the chemical reactions that heat uses to break rubber down, slowing aging and protecting the polymer network. The base chemistry helps too: silicone's silicon-oxygen backbone is naturally stronger against heat than the carbon backbone of organic rubbers. The result is a gasket material that stays flexible, keeps its shape, and holds its seal through years of hot service.
Key Properties of High Temperature Silicone
