http://www.mcmaster.com/#o-rings/=bksjru


Silicone Type
Standard: Has excellent resistance to ozone, weather, detergent, and salt water. Also has good high and low temperature resistance.
FEP-Encapsulated: Perfect for sealing corrosive fluids, an FEP encapsulation makes these O-rings virtually impervious to most solvents and chemicals. Excellent resistance to friction and compression makes them ideal for static sealing applications. The FEP encapsulation meets ASTM D2116 and LP389A and is FDA compliant. Durometer hardness is A85 and temperature range is -75° to 400°F. O-rings are clear with a red-orange inner ring.
FDA Compliant: The FDA-compliant material used to make these o-rings makes them safe for food contact.
Soft: Durometer hardness is A50. Excellent ozone, weather, detergent, and salt water resistance. Good high and low temperature resistance.