Frequently Asked Questions — VMQ O-Rings
What is VMQ silicone rubber?
VMQ (Vinyl Methyl Silicone), commonly called silicone rubber, is an elastomer based on an inorganic Si-O polymer backbone rather than a carbon chain. This structure gives it an extraordinarily wide operating temperature range and inherent cleanliness. VMQ is odourless, tasteless, and non-toxic, making it suitable for food and medical applications.
What temperature range can VMQ o-rings handle?
VMQ silicone o-rings operate from −60 °C to +200 °C in continuous service, with short peak excursions to +230 °C. They remain flexible and elastic at cryogenic temperatures where all organic rubbers become brittle, and retain their properties at sustained temperatures where NBR or EPDM would degrade.
What chemicals is VMQ resistant to?
VMQ has good resistance to hot air, ozone, UV radiation, water (cold and warm), animal and vegetable fats, many dilute acids and alkalis, and food-grade media. It is not suitable for steam above 120 °C, petroleum-based oils or fuels, concentrated acids or bases, aromatic solvents, or ketones, which cause significant swell or degradation.
What are typical applications for VMQ o-rings?
VMQ o-rings are used in food and beverage processing equipment, pharmaceutical manufacturing and laboratory instruments, medical devices (implantable and reusable), aerospace fuel and hydraulic systems, domestic appliances, and any application requiring a wide temperature range or compliance with FDA, EC 1935/2004, or similar food contact regulations.