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O-Ring Material Reference Guide

Material Recommended Use

Not Recommended For

Mechanical Properties
Buna-N  (Nitrile)

Standard: 70 Durometer Black
Temperature Range: -35F to 250F

Least Expensive / Readily Available
Silicone Greases / Oils
Water
Petroleum Oils / Fuels
Ethylene Glycol Fluids
Ketones (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: -15F to 400F

Vacuum
Most Acids / Chemicals
Halogenated Hydrocarbons
Di-Ester Lubricants
Petroleum Oils / Fuels
Silicone Oils / Greases
Ketones (MEK)
Auto / Aircraft Brake Fluids
Amines (Ammonia)
Acetone, Skydrol, Ethyl Acetate
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: -65F to 450F

Dry Heat
Wide Temperature Range
Sunlight, Ozone,  Weathering
Odorless and Non-Toxic
Ketones (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: -60F to 250F

Sunlight, Ozone,  Weathering
Hot Water and Steam
Auto / Aircraft Brake Fluids
Some Acids and Bases
Ketones and Alcohols
Plumbing
Petroleum Oils
Fuels
Good Wear Resistance
Good Comp. Set Resistance
Moderate Short-Term Resilience
Good Permeation Resistance
Material Recommended Use

Not Recommended For

Mechanical Properties

Chemraz / Kalrez / Simriz
(Perfluoroelastomer)

Various Compounds
Designed for Specific Applications
Temperature Range: -10F to 615F

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: -35F to 250F

Refrigerants (Freon)
Ammonia
Some Petroleum Oils
Dilute Acids
Silicone ester Lubricants
Ketones (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: -65F to 200F

Drive Belts
Some Petroleum Oils
Some Hydrocarbon Fuels
Oxygen / Ozone
Ketones (MEK)
Acids
Auto / Aircraft Brake Fluids
Chlorinated Hydrocarbons
Water
Excellent Wear Resistance
Poor Comp. Set Resistance
Excellent Short-Term Resilience
Fluorosilicone

Standard: 70 Durometer Blue
Temperature Range: -80F to 450F

Jet Fuel
Dry Heat
Wide Temperature Range
Some Petroleum Oils
Chlorinated Solvents
Ketones (MEK)
Phosphate Esters
Some Acids
Auto / Aircraft Brake Fluids
Amines (Ammonia)
Poor Wear Resistance
Moderate Comp. 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: -250F to 450F

Chemical Resistance
Fuel Resistance
Low Coefficient of Friction
Non-Elastic
Good Wear Resistance
Low Coefficient of Friction
Material Recommended Use

Not Recommended For

Mechanical Properties

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Copyright 1997-2003  Marco Rubber & Plastic Products, Inc.
334 Clark Street  *  North Andover, MA 01845  USA
1-800-775-6525  Fax: 978-688-6915
e-mail Marco Rubber