MARCO RUBBER :: Mechanical Seals

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Material	Recomended Use	Not Recomended For	Mechanical Properties

Buna-N (Nitrile, NBR)	Silicone Greases / Oils	Keytones (MEK)	Good Wear Resistance
	Water	Halogenated Hydrocarbons	Good Compression Set Resistance
Standard: 70 Durometer Black	Petroleum Oils / Fuels	Auto / Aircraft Brake Fluids	Good Short-Term Resilience
Temperature Range: -35ºF to 250ºF	Ethylene Glycol Fluids	Strong Acids	Good Permeation Resistance
Least Expensive / Readily Available		Sunlight, Ozone, Weathering

Viton® (Fluorocarbon Type A)	Vacuum	Keytones (MEK)	Good Wear Resistance
	Most Acids / Chemicals	Auto / Aircraft Brake Fluids	Excellent Comp. Set Resistance
Standard: 75 Durometer Black	Halogenated Hydrocarbons	Amines (Ammonia)	Moderate Short-Term Resilience
Temperature Range: -15ºF to 400ºF	Di-Ester Lubricants	Acetone, Skydrol, Ethyl Accetate	Excellent Permeation Resistance
	Petroleum Oils / Fuels	Hot Water and Steam
	Silicone Oils / Greases	Low Molecular Esters and Ethers

EPDM (Ethylene Propylene)	Sunlight, Ozone, Weathering	Petroleum Oils	Good Wear Resistance
	Hot Water and Steam	Fuels	Good Comp. Set Resistance
Standard: 70 Durometer Black	Auto / Aircraft Brake Fluids		Moderate Short-Term Resilience
Temperature Range: -60ºF to 250ºF	Some Acids ans Bases		Good Permeation Resistance
	Keytones ans Alcohols
	Plumbing

Perfluoroelastomer	High Temperature Resistance	Molten metals	Good Wear Resistance
(Chemraz® / Kalrez® / Simriz®)	Excellent Chemical Resistance	Gaseous Alkali Metals	Good Comp. Set Resistance
	Low Out Gassing	Halogenated Freons/Fluids	Moderate Short-Term Resilience
Various Compounds	Chlorine Wet/Dry	Uranium Hexafluoride	Good Permeation Resistance
Designed for Specific Applications	Petroleum Oil
Temperature Range: -10ºF to 615ºF	Chlorinated Hydrocarbons