Coupling O-ring materials

Designation	Trade name	ISO 1629	ASTM 1418	Temp_Range (Celsius)	Field of Application
Nitrile Butadiene Rubber	Buna N® Europrene N® Hycar® Nipol N® Perbunan N®	NBR	NBR	-55 to 110	Standard material for hydraulics and pneumatics. Mineral oil-based hydralic fluids, animal and vegetable oils and fats. Flame retardant liquids. Aliphatic hydrocarbons (prophane, butane, petrol). Silicone oils and greases. Water up to 80Cº. Bio oils made from synthetic esters and vegetable oils
Ethylene- Propylene-Diene Rubber	Dutral Keltan® Vistalon® Buna AP®	EPDM	EPDM	-55 to 120	Hot water, vapour, brake fluids, detergents. Alcohols, ketons, engine coolants, flame retardant phosphate-based liquids, organic and inorganic acids and bases. Not resistent to mineral oils
Fluoroelastomer	Fluorel® Technoflon® Viton®	FPM	FKM	-20 to 200	Mineral oil and greases. Aliphatic, aromatic and chlorinated hydrocarbons, petrol, 99 octan petrol, diesel fuels, flame retardant phosphatebased liquids. Silicone oils and greases acids, Iyes
Fluorosilicone Elastomer	-	MFQ	FVMQ	-60 to 200	Mineral oils, fuels. lubricant on Di-Ester basis, hot air.
Silicone	Silastic® Silopren®	MVQ	VMQ	-60 to 200	Mineral oils, fuels. lubricant on Di-Ester basis, hot air.
Hydrogenated Nitrile- Butadiene Rubber	Therban® Tornac® Zetpol®	HNBR**	HNBR**	-35 to 120	Mineral oil-based hydralic fluids, animal and vegetable fats, aliphatic hydrocarbons, diesel fuels, ozone, sour gas, dilute acids and bases Mineral oil-based hydralic fluids, animal and vegetable fats, aliphatic hydrocarbons, diesel fuels, ozone, sour gas, dilute acids and bases
Butyl Rubber	Exxon Butyl® Polysar Butyl®	IIR	IIR	-55 to 100	Butyl is a copolymer of isobutylene and isoprene. It has largely been replaced by ethylene propylene for O-ring usage. Butyl is resistant to the same fluid types as ethylenepropylene and except for resistance to gas permeation, it is somewhat inferior to ethylene-propylene for O-ring service. Excellent weather resistance, and gas permeation resistance. Poor petroleum oil and fuel resistance.
Perfluorinated Elastomer	CHEMRAZ® Kalrez® PERLAST®	FFPM	FFPM	-40 to 260	Best chemical resistance of all elastomers, including organic acids, f.i. acetic acid, benzoic acid, formic acid
Chloroprene Rubber	Baypren® Neoprene®	CR	CR	-40 to 120	Resistant to refrigerants, ammonia, carbon dioxide, freon(R12,R13,R21,R22,R113-R115), silicone oils, water, oxygen(low-pres.), bleaches, coustic soda, alcohols, chlorine, ozone, castor oil and veg. oils. Low resistance to mineral oils!
Polyester / Polyether Urethane Rubber	Adiprene® Urepan® Vulkollan® Desmopan®	AU EU PUR	AU EU	-40 to 100	Mineral oils and greases, oxygen, ozone. HFA and HFB fluids, air. Not resistant in esters, aliphatic, aromatic and chlorinated hydrocarbons, concentrated acids and lyes, water above +50ºC.
Polytetrafluoroethylene	Teflon®	PTFE	PTFE	-200 to 260	PTFE is used wherever the chemical and thermal resistance of the normal elastomer is no longer sufficient. These are primarily applications in the chemical industry, foodstuffs industry, pharmaceuticals and medical technology. PTFE are used only as static seals, e.g. on flange connections, on covers, .etc.
Fluorinated Ethylene Propylene	Teflon FEP®	FEP/MVQ FEP/FPM	FEP/VMQ FEP/FKM	-60 to 200 -20 to 200	FEP is used wherever the chemical and thermal resistance of the normal elastomer is no longer sufficient. These are primarily applications in the chemical industry, foodstuffs industry, pharmaceuticals and medical technology.
Perflouralkoxy	Teflon PFA®	PFA/MVQ FEP/FPM	FEP/VMQ FEP/FKM	-60 250 -20 250	PFA is used wherever the chemical and thermal resistance of the normal elastomer is no longer sufficient. These are primarily applications in the chemical industry, foodstuffs industry, pharmaceuticals and medical technology.
Tetrafluoroethylene- Propylene Copolymer Elastomer	Aflas®	--	TFE / P**	-25 to 200	Mineral oils and greases, brake fluids, fuels, alcohols, heat transfer media, oils. amines, acids, bases