Natural Rubber is frequently used in applications where high resilience, low hysteresis, and low heat build-up are required, but where resistance to petroleum hydrocarbons is not required. Natural rubber is of some interest for use in seals because it is resistant to certain other classes of fluids. One common application of natural rubber seals is in automotive brake systems.

General Information for Natural Rubber

Compound Series: 1-600 to 1-699
Temperature Range (F): -65° to +180°
General Properties: Good strength, toughness, tear resistance, resilience and abrasion resistance
Most Common Applications: Packing and seals for water and water-based fluids (e.g. drilling "mud" used in oil exploration)
Truck tires
Bridge bearing pads
Anti-vibration mountings
Specific Compound Information: Natural Rubber

Compound Number: 1-665-70
Use with: Alcohol
Engine coolant
Water
Silicone oil
Do not use with: Petroleum oils and fuels
Temperature Range (F): -65° to +180°
Comments: Good strength, toughness and tear resistance. Seldom used for O-rings; Neoprene has better resistance to oil, ozone, sunlight and weathering
Relative Properties of Natural Rubber

Tensile Strength (psi)
-Pure Gum:
-Compounded Stocks:
Over 3000
Over 2000
Hardness Range:
(Shore Durometer A)
30 - 90
Specific Gravity:
(Base Material)
.93
Vulcanizing Properties: Excellent
Adhesion to Metals: Excellent
Adhesion to Fabrics: Excellent
Tear Resistance: Good
Abrasion Resistance: Very Good
Compression Set: Good
Rebound
-Cold:
-Hot:
Excellent
Excellent
Dielectric Strength: Excellent
Electrical Insulation: Good to Excellent
Permeability to Gases: Medium
Temperature Range in Air (F): -75° to +200°
Acid Resistance
-Dilute:
-Concentrated:
Fair to Good
Fair to Good
Caustic Resistance: Fair
Solvent Resistance
-Aliphatic Hydrocarbons:
-Aromatic Hydrocarbons:
-Oxygenated (Keytones, etc.):
-Lacquer Solvents:
Poor
Poor
Poor
Poor
Resistance To
-Swelling in Lubricating Oil:
-Gasoline:
-Animal and Vegetable Oil:
-Water Absorption:
-Oxidation:
-Ozone:
-Sunlight Aging:
-Heat Aging:
-Flame:
-Heat:
-Cold:
Poor
Poor
Poor to Good
Very Good
Good
Poor
Poor
Fair
Poor
Good
Excellent

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