Superb High and Low Temperature Capabilities Enable Silicone O-Ring To Be Used In Long Term Exposure To Dry Heat. Due To Poor Abrasion Resistance, Silicone O-Rings Perform Best In Static Sealing Applications. Silicone Resists Brake Fluids and High Aniline Point Oil. Not Recommended For Ketones Or Most Petroleum Oils. Temperature Range Is -65°F To 450°F. Hardness Is 65-75 Shore A Durometer. Amber in Color.