VMQ Silicone (Polydimethylsiloxane Rubber)
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Also known as: silicone rubber · VMQ · PVMQ · MQ silicone · food-grade silicone
VMQ Silicone (polydimethylsiloxane) is a flexible, FDA-compliant elastomer operating from –60°C to +200°C with excellent electrical insulation — used in food, pharma, and high/low temperature sealing.
Technical Detail
VMQ is the ISO 1629 designation for methyl-vinyl silicone rubber. The siloxane backbone (Si–O) gives a uniquely wide service temperature: –60°C to +200°C continuous, short spikes to +230°C. Key properties: excellent biocompatibility (FDA 21 CFR 177.2600, USP Class VI), odourless and tasteless, good UV and ozone resistance, low compression set at both high and low temperatures; poor resistance to petroleum oils, fuels, steam above 150°C, and concentrated acids/alkalis. Tensile strength is lower than NBR/EPDM — use for low-pressure static seals only. Standard hardness: 40–70 Shore A. Applications: food and beverage tubing connections, pharmaceutical CIP/SIP fittings, medical device seals, oven door gaskets, electrical connector O-rings, and cryogenic service. Specify peroxide-cured (not sulphur) for food/pharma compliance.
Reference Standards
- FDA 21 CFR 177.2600
- USP Class VI
- ISO 1629 VMQ
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