Silicone O-Rings

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 properties 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. Global O-Ring and Seal supplies silicone o-rings that are compliant with FDA standards, and are suitable for use in food and beverage production lines, as well as medical and pharmaceutical manufacturing. Both silicone and metal detectable silicone o-rings meet FDA compliance.

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 are usually applied in medical systems or other applications requiring low volatile matter. However, they need to be produced in a clean room and require a higher cost of platinum catalyzed, making them more expensive than peroxide-cured ones.

Silicone O-Ring Compounds

Compounds	Durometer	Color	Temp Range (F)	Data Sheet	Description
S50	50	Red	-76 to +437		FDA-Grade
S60610	60	Red	-76 to +437		FDA-Grade
S70478	70	Clear	-76 to +437		USP Class VI Certified, Platinum Cured
S70610	70	Red	-76 to +437		FDA-Grade
S70BL70	70	Blue	-67 to +392		USP Class VI Certified, ISO 10993-5 Compliant
S75612	75	Red	-76 to +437		Metal/X-ray detectable, FDA-Grade