Silicone (VMQ) offers an exceptionally wide operating temperature range, excellent electrical insulation, and FDA/USP Class VI compliant grades for food, beverage and medical-device sealing. Mechanical strength is lower than most elastomers, so FITCO reserves silicone for static or low-pressure dynamic seals.
| Temperature range | -60°C to +230°C |
|---|---|
| Hardness range | 30–80 Shore A |
| Relative cost | $$ |
| Resists | Extreme heat/cold, ozone, UV, water, mild cleaning chemicals |
| Avoid with | Hydrocarbon fuels/oils, concentrated acids, steam under pressure, high abrasion duty |
| Standards | AS568 / ISO 3601 / BS 4518 |
Silicone isn't a single formulation — the grade below matters as much as the base compound once your application gets specific.
Standard heat-cured, high-consistency silicone for general electronics, appliance and HVAC gasketing where FDA/medical certification isn't required.
Platinum-catalyzed cure system (rather than peroxide) avoids cure-byproduct residues, meeting USP Class VI and FDA food-contact requirements for pharmaceutical and food/beverage sealing.
A high-consistency rubber silicone formulated for tight-tolerance, high-purity parts via compression molding — FITCO's route to precision silicone components without requiring injection-molded LSR tooling.
Not sure which sub-grade fits your application? Send us your fluid, temperature and pressure and our engineers will confirm — send an enquiry →
Physical property data — hardness, tensile strength, elongation, compression set and temperature resistance — tested to ASTM/ISO standards for each hardness grade FITCO stocks.
Full physical property data sheet — hardness, tensile strength, elongation at break, compression set and temperature resistance.
Download Datasheet →General-purpose seal for mineral oils, fuels and hydraulic fluids.
-20°C to +200°CHigh-temperature, chemical-resistant sealing for oil & gas and process industries.
-15°C to +327°CNear-universal chemical resistance for the most demanding process seals.
Compare Silicone O-Rings against alternative compounds to confirm you have the right elastomer for your application.
O-Ring Measurement Guide →Select standard, cross-section and ID — get instant OD and material readout for Silicone O-Rings.
Open Size Chart →Download the physical property datasheet for this compound — hardness, tensile strength, compression set and temperature resistance.
Download PDFs →Standard Silicone O-rings cover most food, pharma and high-temperature applications. For the most chemically aggressive environments, FITCO also offers Silicone-cored FEP encapsulated O-rings and PTFE coated Silicone O-rings.
A seamless FEP or PFA fluoropolymer jacket over a Silicone elastomer core. The FEP jacket provides near-universal chemical resistance — resistant to virtually all acids, solvents and oxidisers that would degrade even FDA Silicone — while the Silicone core maintains elastic recovery and sealing force. This is the standard specification for:
A thin PTFE coating applied over the FDA Silicone O-ring surface. The Silicone base provides all sealing chemistry and FDA compliance; the PTFE coating reduces assembly friction, prevents the O-ring from sticking to groove surfaces during extended static service, and provides a clean, non-extractable contact surface that meets food-grade requirements without additional assembly lubricant.
USP Class VI and FDA platinum-cured Silicone O-rings for bioreactors, autoclaves, pumps and sterile process connections — low extractables, steam sterilisation compatible.
View pharmaceutical applications → IndustryFDA-grade Silicone for dairy, beverage, brewing and food processing equipment. Silicone does not impart taste or odour and withstands repeated CIP cycles with caustic and acid cleaning agents.
View food applications → IndustrySilicone's electrical insulation and wide temperature range (−60°C to +230°C) suits electronics enclosure gaskets, automotive engine sensor seals and lighting system gaskets.
View automotive applications →Send us your fluid, temperature and pressure — our engineers will confirm the compound.
