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| Harda
Inc. |
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PROPERTIES |
Natural Rubber |
SBR |
EPDM |
Silicone |
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HARDNESS RANGE, IRHD |
30 - 90 |
40 - 90 |
30 - 90 |
30 - 80 |
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TENSILE STRENGTH, MPa |
21 |
14 |
14 |
7 |
| RESISTANCE TO: |
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ABRASION |
Excellent |
Good |
Good |
Poor |
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COMPRESSION SET |
Good |
Good |
Good |
Good |
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TEAR |
Good to V/Good |
Fair |
Fair to Good |
Poor |
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FLAME |
Poor |
Poor |
Poor |
Good |
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GAS PERMEABILITY |
Fairly Low |
Fairly Low |
Low |
Low |
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ELECTRICAL INSULATION |
Good to V/Good |
Good to V/Good |
Excellent |
Excellent |
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ACIDS Dilute |
Fair to Good |
Fair to Good |
Excellent |
Good |
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Concentrated |
Fair to Good |
Fair to Good |
Excellent |
Fair |
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SOLVENTS Aliphatic hydrocarbons |
Poor |
Poor |
Poor |
Poor |
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Aromatic hydrocarbons |
Poor |
Poor |
Poor |
Poor |
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Oxygenated ( Ketones, etc) |
Fair |
Fair |
Good to V/Good |
Fair |
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OTHER MEDIA Lubricating oil |
Poor |
Poor |
Poor |
Fair |
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Oil and petrol |
Poor |
Poor |
Poor |
Fair |
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Animal and vegetable oils |
Fair |
Fair |
Good |
Good |
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Water |
V/Good |
Good |
Excellent |
Good |
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Ozone |
Poor |
Poor |
Excellent |
Excellent |
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Oxidation |
Fair |
Fair |
V/Good |
Excellent |
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Weathering |
Fair |
Fair |
Excellent |
Excellent |
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Minimum deg C |
-40 |
-40 |
-50 |
-60 |
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MAIN FEATURE |
Outstanding
Mechanical
Properties |
General
Purpose
Resistance |
Chemicals
Water and Steam |
High and Low
Temperature
Resistance |
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