Materialguide for O-Rings

O-Ring Reference Guide

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Material	Recomended Use	Not Recomended For	Mechanical Properties
Buna-N (Nitrile) Standard: 70 Durometer Black Temperature Range: -37º Celsius to 120º Celsius Least Expensive / Readily Available	Silicone Greases / Oils Water Petroleum Oils / Fuels Ethylene Glycol Fluids	Keytones (MEK) Halogenated Hydrocarbons Auto / Aircraft Brake Fluids Strong Acids Sunlight, Ozone, Weathering	Good Wear Resistance Good Compression Set Resistance Good Short-Term Resilience Good Permeation Resistance
Viton® (Fluorocarbon Type A) Standard: 75 Durometer Black Temperature Range: -26º Celsius to 204º Celsius	Vacuum Most Acids / Chemicals Halogenated Hydrocarbons Di-Ester Lubricants Petroleum Oils / Fuels Silicone Oils / Greases	Keytones (MEK) Auto / Aircraft Brake Fluids Amines (Ammonia) Acetone, Skydrol, Ethyl Accetate Hot Water and Steam Low Molecular Esters and Ethers	Good Wear Resistance Excellent Comp. Set Resistance Moderate Short-Term Resilience Excellent Permeation Resistance
Silicone Standard: 70 Durometer Orange Temperature Range: -54º Celsius to 232º Celsius	Dry Heat Wide Temperature Range Sunlight, Ozone, Weathering Odorless and Non-Toxic	Keytones (MEK) Acids Silicone Oils Brake Fluids	Poor Wear Resistance Excellent Comp. Set Resistance Poor Short-Term Resilience Excellent Permeation Resistance
EPDM (Ethylene Propylene) Standard: 70 Durometer Black Temperature Range: -51º Celsius to 121º Celsius	Sunlight, Ozone, Weathering Hot Water and Steam Auto / Aircraft Brake Fluids Some Acids ans Bases Keytones ans Alcohols Plumbing	Petroleum Oils Fuels	Good Wear Resistance Good Comp. Set Resistance Moderate Short-Term Resilience Good Permeation Resistance
Material	Recomended Use	Not Recomended For	Mechanical Properties
Chemraz / Kalrez / Simriz (Perfluoroelastomer) Various Compounds Designed for Specific Applications Temperature Range: -23º Celsius to 323º Celsius	High Temperature Resistance Excellent Chemical Resistance Low Out Gassing Chlorine Wet/Dry Petroleum Oil Chlorinated Hydrocarbons	Molten metals Gaseous Alkali Metals Halogenated Freons/Fluids Uranium Hexafluoride	Good Wear Resistance Good Comp. Set Resistance Moderate Short-Term Resilience Good Permeation Resistance
Neoprene® (Chloroprene) Standard: 70 Durometer Black Temperature Range: -37º Celsius to 121º Celsius	Refrigerants (Freon) Ammonia Some Petrolium Oils Dilute Acids Silicone ester Lubricants	Keytones (MEK) Gasoline Auto / Aircraft Brake Fluids	Good Wear Resistance Moderate Comp. Set Resistance Moderate Short-Term Resilience Good Permeation Resistance
Urethane Standard: 90 Durometer Translucent Temperature Range:-53º Celsius to 93º Celsius	Drive Belts Some Petroleum Oils Some Hydrocarbon Fuels Oxygen / Ozone	Keytones (MEK) Acids Auto / Aircraft Brake Fluids Chlorinated Hydrocarbons Water	Excelent Wear Resistance Poor Comp. Set Resistance Excelent Short-Term Resilience
Fluorosilicone Standard: 70 Durometer Blue Temperature Range: -62º Celsius to 232º Celsius	Jet Fuel Dry Heat Wide Temperature Range Some Petroleum Oils Clorinated Solvents	Keytones (MEK) Phosphate Esters Some Acids Auto / Aircraft Brake Fluids Amines (Ammonia)	Poor Wear Resistance ModerateComp. Set Resistance Moderate Short-Term Resilience Poor Permeation Resistance
Teflon Encapsulated O-Ring Covered with Teflon Tube Usually Silicone or Viton®	Depends on O-Ring Core Chemical Resistance Heat Resistance	Depends on O-Ring Core	Good Wear Resistance Good Short-Term Resilience Good Permeation Resistance
Teflon® Standard: Non-Elastic White Temperature Range: -156º Celsius to 232º Celsius	Chemical Resistance Fuel Resistance Low Coefficient of Friction	Non-Elastic	Good Wear Resistance Low Coefficient of Friction

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Viton® and Kalrez® are registered trademark of DuPont Performance Elastomers
Teflon® is a registered trademark of DuPont
Chemraz® is a registered trademark of Green Tweed.
Quad-Ring® is a registered trademark of Minnesota Rubber.