Seals Eastern, Inc.

Rubber (Elastomer) Selection Guide

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Rubber, otherwise known as an elastomer or polymer is available in a number of molecular configurations or families. Our Elastomer Selection Guide is designed to let you examine the general properties of any family of elastomer (polymer). The ratings reflect the average performance of an elastomer family. Compounding and manufacturing techniques may improve or degrade the performance level noted in the guide.

"We do not want to sell you our elastomer, we want to sell you the right elastomer."

Polymer Selection
Common Name Nitrile(highACN)
ASTM Name Acrylonitrile-butadiene (38%ACN)
ASTM D1418 designation NBR
Specific Gravity (gm/cm3) 1
Physical Properties at 21C (70F) 1-Excellent . . . 5-Poor
Tensile Strength -Reinforced, max (psi) 4000
Elongation % - Reinforced, max 650
Compression Set 2
Resilience 2.5
Permeability Coef.-Nitrogen 1 0.18
Electrical  Resistivity 3.5
Strain Relaxation 2
Mechanical Properties 1-Excellent . . . 5-Poor
Impact Strength 3
Abrasion Resistance 1
Tear Resistance 2
Cut Growth 2
Temperature Effects 1-Excellent . . . 5-Poor
Tensile Strength % change @ 212F -50
Tensile Strength % change @ 350F -75
Elongation % change @ 212F -30
Elongation % change @ 350F -57
Strain Relaxation @ 212F 2
Heat Aging @ 212F 2
Flame Resistance 4
Low Temp - Tg (glass transition) -13
Low Temp Stiffening (F) 30
Low Temp Brittle Point (F) -40
Environment Resistance 1-Excellent . . . 5-Poor
Weather--Sunlight Aging 4
Oxidation 2
Ozone 3
Radiation 2
Water 1
Steam 2.5
General Chemical Resistance 1-Excellent . . . 5-Poor
Alkali (Base) Dilute 2
Alkali (Base) Concentrated 2
Acid Dilute 2
Acid Concentrated 2
Ketones, Oxygenated Solvents (mw < 80) 4
Chlorinated Hydrocarbons, Degreasers 2.5
Aliphatic Hydrocarbons, Kerosene, etc. 1
Aromatic Hydrocarbons, Benzol, Toluol, etc. 1.5
LP Gases, Fuel Oils 1
Alcohols (mw < 80) 2.5
Animal and Vegetable Oils 2
Synthetic Lubricants - Diester 1.5
Brake Fluid, non-petroleum base 5
Hydraulic Fluids Resistance 1-Excellent . . . 5-Poor
Petroleum Base 2.5
Water Glycol 3
Silicate Ester 2
Phosphate Ester 4
Lubricating Oils Resistance 1-Excellent . . . 5-Poor
High Aniline (190F +) 2
Low Aniline Point 1
Refrigerants Resistance 1-Excellent . . . 5-Poor
Ammonia 2
Halogenated r-11, 12, 13
Methyl Chloride 5
Halogenated + Oil r-11, 12
Miscellaneous 1-Excellent . . . 5-Poor
Taste (1=neutral .... 5=foul) 2.5
Odor (1=neutral .... 5=foul) 2
Non-Staining 3.5
Bonding to Rigid Materials 1.5

Footnotes:
1 - (1/10^8cm2)(1/10sec)(1/10atm)

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