Viton® Seal

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Home > Kalrez® > Comparison Chart

Kalrez® O-Rings and Seals

Elastomer Comparison Chart

Kalrez® perfluoroelastomer o-rings and seals last longer and seal more effectively than o-rings and seals from other elastomers due to their exceptional chemical resistance and thermal stability.

Kalrez® o-rings and seals can withstand attack by more than 1,800 chemicals, including many acids and amines that cause other elastomers to fail due to excessive swelling. Even after long-term exposure to temperatures up to 316°C (600°F), Kalrez® retains its elasticity and recovery properties better than other high-temperature elastomers.

   
Neoprene  		 Ethylene  
propylene  		 Buna-N  
nitrile  		 Fluoro- 
silicone 		 Fluoro- 
elastomer 		 Perfluoro-
elastomer
ASTM Code CR EPM NBR FVMQ FKM (Viton®) FFKM (Kalrez)
Hardness durometer
(Shore A)		 20 to 90 40 to 80 40 to 95 40 to 80 55 to 95 65 to 95
Tensile strength (lb/in 2) 3,000 2,500 2,500 900 2,500 2,000
Wear resistance G G G N G G
Fireproof hydraulic fluids R VG N VG R E
Lubricating oils G N G E E E
Fuel oils R N G E E E
Hydraulic oils G N E E E E
Vegetable Oils G R E E E E
Animal Fats G R E E E E
Petrol (normal) R N VG E E E
Petrol (high-octane) N N G E E E
Kerosene R N VG E E E
Aromatic hydrocarbons N N R VG E E
Aliphatic hydrocarbons G N VG E E E
Water (under 80°C) R E VG E E E
Water (above 80°C) N E R E E E
Alcohols E E VG E E E
Ketones N G N N N E
Concentrated acids N R N G VG E
Diluted acids G G R VG E E
Alkalis G VG R R N E
Halogenated solvents N N R VG VG VG
Max. temp. at continuous service 105°C 135°C 135°C 200°C 204°C 316°C
Compression set VG G VG G VG G
Flame-resistant yes no no no yes yes

Next Topic: Zalak® high performance seals

Kalrez® is a registered trademark of DuPont Performance Elastomers

 

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