JCS Standard AS 568A 5/8inch O.D, 1/2inch I.D. Viton 75 Durometer O-Ring, 10pcs. JCS Standard AS 568A 5/8inch O.D., 1/2inch I.D. Viton 75 Durometer O-Ring, 10pcs. Excellent high temperature capability.Can withstand brief intermittent Exposure to 600 degrees. Low compression set. Good resistance to a wide variety of chemicals. Temperature: -15deg. To 400deg. 75 Durometer Made in USA