Silicone O-Ring (MQ, VMQ, PVMQ) Material Description


Physically, silicone o-rings are based on silicon, an element derived from quartz. To create this class of synthetic elastomers, pendant organic groups such as methyl, phenyl and vinyl are attached to silicon atoms. Different additions of side chains can achieve significant variations in properties. Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. Silicone o-rings may also come in a metal detectable variation, while retaining the same qualities as the general silicone o-ring compound.

Silicone o-rings are preferable for use with engine and transmission oils, salt solutions, water, dry heat, and conditions requiring weather resistance. Silicone o-rings are not preferable for use with concentrated acids and alkalis, petroleum oils and fuels, steam (over 248ºF), and ketones.

Cure System: Peroxide-Cured

Standard silicone o-ring compounds are usually peroxide-cured. Platinum-cured compounds offer better flexible properties and very low volatile matter. Platinum-cured silicone o-rings usually are applied in medical systems or other required low volatile matter. However, they need to be produced in a clean room and with a higher cost of platinum catalyzer, making them more expensive than peroxide-cured ones.

Silicone O-Ring Temperature Range:

Standard Low Temp: -60°C (-76°F)
Standard High Temp: 225°C (437°F)

SPEC SHEET: Silicone 70 Durometer

SPEC SHEET: Silicone 70 Durometer – Metal & X-Ray Detectable


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