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Silicone Rubber is primarily useful in applications involving a wide range of temperature. Resistance to petroleum oils is poor except for certain high aniline point lubricating oils, to which it is moderately resistant. Low tensile strength and poor resistance to abrasion and tear limit use to static seals only. For most silicone compounds, parts molded in standard molds will be undersize by various amounts up to several percent, necessitating special molds if size is critical. Resistance to sunlight, ozone and weathering is excellent. Special compounds are available which remain usefully flexible to as low as -130°F and have brittle points near -175°F. Upper temperature limit is +500°F, although certain compounds will tolerate +600°F for brief periods.
Sample compound information: 4-1235-50 / 4-1235-60 / 4-1235-70
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General Information for Silicone Rubber
| Compound Series: |
4-1000 to 4-1699 |
| Temperature Range (F): |
-80° to +400° |
| General Properties: |
Broad temperature range. Special compounds of either -175°F flexibility or heat resistance to +600°F. Relatively poor tensile, tear and abrasion resistance. |
| Most Common Applications: |
Electrical connector inserts
Hot air duct seals
Dust shields and boots
Spark plug boots
Medical product seals
Electric appliance seals
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Relative Properties of Silicone Rubber
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Silicone Rubber
4-1235-50
| Compound Number: |
4-1235-50 |
| Use with: |
Dry heat
Alcohol
Vegetable oils
Oxygen
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| Do not use with: |
Petroleum oils and fuels
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| Temperature Range (F): |
-80° to +400° |
| Color: |
Brick red |
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Silicone Rubber
4-1235-60
| Compound Number: |
4-1235-60 |
| Use with: |
Dry heat
Alcohol
Vegetable oils
Oxygen
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| Do not use with: |
Petroleum oils and fuels
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| Temperature Range (F): |
-80° to +400° |
| Color: |
Brick red |
| Comments: |
Meets spec. AMS 3303
Meets spec. ZZ-R-765B, Class 2, Grade 60 |
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Silicone Rubber
4-1235-70: One of a series of similarly numbered compounds ranging in hardness from 50 to 80. These particular silicone compounds were specially developed by ESI to obtain a molding shrinkage equivalent to organic rubber. This enables ESI to produce parts from existing molds originally made for different types of rubber and to obtain from them parts equivalent to organic dimensions. Temperature range -100°F to +500°F.
| Compound Number: |
4-1235-70 |
| Use with: |
Dry heat
Alcohol
Vegetable oils
Oxygen
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| Do not use with: |
Petroleum oils and fuels
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| Temperature Range (F): |
-80° to +400° |
| Military drawing numbers: |
MS 9068 |
| Color: |
Brick red |
| Comments: |
Meets spec. AMS 3304
Meets spec. ZZ-R-765B, Class 2, Grade 70
Conforms to FDA requirements
Reference CFR 177.2600
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