Kalrez is the tradename for a perfluoroelastomeric material which is compounded and moulded into O-rings, gaskets, and speciality parts. Kalrez has excellent resistance to temperature and chemicals, some grades have a maximum continuous service temperature of 327°C. Perfluoroelastomer (FFKM) O-rings and gaskets are generally used in applications of aromatic hydrocarbons and in highly corrosive fluids and can generally withstand to a temperature of -7°C to maximum of 480°C.

Kalrez is suitable for dynamic and static seal of o-rings in the environment containing the following chemicals: Glacial Acetic Acid, Acetic Anhydride, Acetone, Acrylonitrile, Aluminium Chloride, Aluminium Sulfate, Anhydrous Ammonia, Cold Gas Ammonia, Hot Gas Ammonia, Ammonium Carbonate, Concentrated Ammonium Hydroxide, Ammonium Nitrate, Ammonium Phosphate, Ammonium Sulfate, Amyl Acetate, Amyl Alcohol, Aniline, Argon, Aromatic Fuel 50%, Beer, Benzene, Benzine (Ligroin), Bleach Liquor, Borax Solutions, Boric Acid, Bromine Gas, Butadiene Monomer, Butane, Butyl Alcohol, Calcium Carbonate, Calcium Chloride, Calcium Hydroxide, Calcium Hypochlorite, Carbon Disulfide, Carbon Monoxide, Carbon Tetrachloride, Carbonic Acid, Chlorinated Solvents, Dry Chlorine, Wet Chlorine, Chloroform, Chlorosulfonic Acid, Chromic Acid, Citric Acid, Cod Liver Oil, Corn Oil, Coal Tar Creosote, Creosylic Acid, Crude Oil (Asphalt Base), Cyclohexane, Diacetone Alcohol, Dibutyl Phthalate, Diesel Oil, Diethylamine Glycol, Dimethyl Phthalate, Diphenyl, Dowtherm A, Ethane, Ethanol, Ethyl Alcohol, Ethyl Benzene, Ethyl Benzoate, Ethyl Chloride, Ethyl Chlorocarbonate, Ethyl Diamine, Ethyl Ether, Ethyl Formate, Ethyl Hexanol, Ethylene, Ethylene Dichloride, Ethylene Glycol, Ethylene Oxide, Ethylene Trichloride, Formaldehyde, Freon 11 (M), Freon 113, Freon 114, Freon 12, Freon 22, Fuel Oil, Furfural, Automotive Gasoline, Gelatine, Glucose, Glycerin, General Glycol, Helium, Heptane, Hexane, Hexyl Alcohol, Hydrazine, Hydrochloric Acid, Hydrofluoric Acid, Hydrogen Peroxide, Iodine, Isobutyl Alcohol, Isopropanol, Isopropyl Acetate, Isopropyl Chloride, Isopropyl Ether, JP 3 MIL-J5624, JP 4 MIL-J5624, JP 5 MIL-J5624, JP 6 MIL-J5624, Kerosene, Lacquers, Animal Fat Lard, Hydraulic Fluid (Phosphate Ester Type) Lindol, Linsed Oil, Liquefied Petroleum Gas (LPG), Lye, Maleic Acid, Mercuric Chloride, Mercury, Methane, Methanol, Methyl Acetate, Methyl Acrylate, Methyl Alcohol, Methyl Bromide, Methyl Butyl Ketone, Methyl Cellosolve, Methyl Chloride, Methyl Ether, Methyl Ethyl Ketone (MEK), Methyl Isobutyl Ketone (MIBK), Methylene Chloride, MIL-F-25558 (RJ-1), MIL-H-5606, JP-5 JP-4 JP-3 MIL-J 5624, Milk, Naphtha, Naphthalene, Naphthalenic, Natural Gas, Neatsfoot Oil, Nitric Acid, Nitrobenzene, Nitroethane, Gas Nitrogen, Nitromethane, Nitropropane, Oleic Acid, Oleum (Fuming Sulfuric Acid), Oxalic Acid, Cold Oxygen, Peanut Oil, Phenol, Phosphoric Acid, Phosphoric Trichloride, Potassium Nitrate, Potassium Sulfate, Propane, Propylene, Propylene Oxide, RJ-1 (MIL-F-25558), Sea Water, Silicone Grease, Silicone Oils, Silver Nitrate, Skydrol 500, Sodium Bicarbonate, Sodium Carbonate, Sodium Chloride, Sodium Hydroxide, Soyabean Oil, Steam to 350F, Stearic Acid, Stoddard Solvent, Styrene Monomer, Sucrose Solutions, Sulfur Chloride, Dry Sulfur Dioxide Gas, Wet Sulfur Dioxide Gas, Sulfur Trioxide, Sulfuric Acid (Concentrated), Sulfurous Acid, Tannic Acid, Tartaric Acid, Tetrachloroethane, Tetrachloroethylene, Tetraethyl Lead, Tetrahydrofuran, Toluene, Triethanolamine, Turpentine, Varnish, Vinegar, Fresh Water, Whiskey, Xylene.

O-Ring material Kalrez is usually suitable for static seal in the environment containing Hydrobromic Acid.

O-Ring material Kalrez is sometimes ok for static seal but not for dynamic seal in the environment containing chemicals such as Acetaldehyde, Acetylene Gas, Benzoic Acid, Ethyl Acetoacetate.

Kalrez is not suitable for o-rings exposed in the environment containing chemicals such as Freon TF, Iso Octane.