Common o-ring materials

Buna/Nitrile (N, NBR, BUNA-N)
Available Durometers: 40 – 90 Temperature. Range -40˚ – / + 250˚ F / -40˚ – / + 121˚ C
Standard Color: Black Standard Durometer: 70
Do Not Use With: Brake Fluids, Aircraft, & Acetone FDA Compound Available: Yes
Resistant To: Oil, Air, Water, Gasoline, Engine Coolant, Silicone Greases, Hydraulic Fluids, & Alcohols.
Ethylene-Propylene (EP, EPR, EPDM)
Available Durometers: 40 – 90 Temperature. Range -60˚ – / + 300˚ F / -51˚ – / + 150˚ C
Standard Color: Black Standard Durometer: 70
Do Not Use With: Solvents or aromatic hydrocarbons FDA Compound Available: Yes
Resistant To: Steam (400˚ F), Hot Water, Sunlight, Silicone Oils & Greases, Dilute Acids, and Auto Brake Fluids.
Silicone (S, MQ, VMQ, PVMQ)
Available Durometers: 25 – 80 Temperature. Range -75˚ – / + 450˚ F / -59.5˚ – / + 232˚
Standard Color: Rust/Orange Standard Durometer: 70
Do Not Use With: Fuels, Silicone & Petroleum-based Oils, Acids FDA Compound Available: Yes
Resistant To: High/Dry Heat, Fungus, Sunlight, Ozone, and Weathering. Conforms to FDA/sanitary regulations
Polyurethane (P)
Available Durometers: 70 & 90 Temperature. Range -60˚ – / + 225˚ F / -51˚ – / + 107˚ C
Standard Color: Translucent or Black Standard Durometer: 70
Do Not Use With: Alcohols, Hot water, steam FDA Compound Available: No
Resistant To: High hydraulic pressure applications. Primarily used for drive belts.
Neoprene/Chloroprene (C, CR)
Available Durometers: 40 – 90 Temperature. Range -45˚ – / + 225˚ F / -43˚ – / +107˚ C
Standard Color: Black Standard Durometer: 70
Do Not Use With: Aromatic/chlorinated hydrocarbons, acetones FDA Compound Available: No
Resistant To: Ozone, sunlight & oxygen aging. Low Compression Set.
Viton/Fluorocarbon (V, FKM)
Available Durometers: 50 – 95 Temperature. Range -20˚ – / + 400˚ F / -29˚ – / + 204˚ C
Standard Color: Black/Brown Standard Durometer: 75
Do Not Use With: Acetone, Ketones, Steam/Hot Water FDA Compound Available: No
Resistant To: High temperature limits, wide chemical compatibility. Petroleum products & solvents.
Flourosilicone (L, FVMQ)
Available Durometers: 50 – 80 Temperature. Range -75˚ – / + 400˚ F / -59.5˚ – / + 204˚
Standard Color: Blue Standard Durometer: 70
Do Not Use With: Acetone, Amines FDA Compound Available: No
Resistant To: Air, sunlight, ozone, chlorinated & aromatic hydrocarbons. Aerospace fuel systems & auto fuel emission control systems
Additional Materials Available
Aflas Teflon & Teflon Encapsulated (TFE, PTFE) Butyl Kalrez® & Simriz®
Vegetable Fiber Chemraz®    
       
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