Silicone Rubber (MQ, VMQ, PVMQ)
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 possess the best flexible property at low temperature but have low tensile strength and poor wear and tear resistance.
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.
Standard Low Temp: -60°C (-76°F)
Standard High Temp: 225°C (437°F)