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O-Ring Material Reference Guide
| Material | Recomended Use | Not Recomended For |
Mechanical Properties |
| Buna-N (Nitrile) Standard: 70 Durometer Black Temperature Range: -35ºF to 250ºF 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 |
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 |
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 |
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® Various Compounds |
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 |
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 |
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 |
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 |
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 |
Chemical Resistance Fuel Resistance Low Coefficient of Friction |
Non-Elastic | Good Wear Resistance Low Coefficient of Friction |
| Material | Recomended Use | Not Recomended For |
Mechanical Properties |
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Copyright © 1997-2003 Marco Rubber
& Plastic Products, Inc. |
