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Sheet Sealing Materia |
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Elastomers |
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ELASTOMERS  |
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| Elastomeric gasket materials
offer sealing for low temperature and pressure applications. They
require lower bolt loads to seal, and offer excellent recovery due
to their self-energising behaviour. They consist of a polymer inserted
with vulcanising agents, fillers, pigments and various additives.
Common elastomers are: |
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| 1.
Natural Rubber |
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| It is
suitable for most inorganic salts, ammonia, mild acids and alkalis.
It is not recommended for oil and solvents. |
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| Temp.
Range: -50 to 120 deg C. |
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| 2.
Neoprene |
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| It is suitable
for oil, gas, moderate acids, alkalis, salt solutions, petroleum,
solvents and fuels. It is not recommended for strong acids and greases,
and most hydrocarbons. |
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| Temp.
Range -50 to 110 deg C. |
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| 3.
Nitrile (NBR) |
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| It offers
good resistance to oils, solvents, aromatic and aliphatic hydrocarbons,
petroleum oils and gasoline. It is not recommended for strong oxidising
agents, chlorinated hydrocarbons, ketones and esters. |
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| Temp.
Range -50 to 120 deg C. |
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| 4.
Butyl |
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| It offers
excellent resistance to wear and tear and abrasion. Suitable for mild
acid and alkali service. It offers little resistance to commercial
oils and fuels. |
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| Temp.
Range -40 to 150 deg C. |
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| 5.
Viton |
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| It offers
excellent resistance to acids, aliphatic hydrocarbons, oils, and gasoline
and corrosive applications. It has excellent resistance to temperature
and gas permeability. It is not recommended for amines, esters, steam
and low temperature applications. |
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| Temp.
Range -20 to 200 deg C. |
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| 6.
Ethylene Propylenediene (EPDM) |
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| It offers
good resistance to heat, steam, strong acids and alkalis. It is not
recommended for oil, solvents, and aromatic hydrocarbons. |
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| Temp.
Range -50 to 150 deg C. |
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| 7.
Styrene Butadiene (SBR) |
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| Excellent
resistance to abrasion and used for weak acids and moderate chemicals.
It is not recommended for strong acids, most hydrocarbons and ozones.
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| Temp.
Range -50 to 120 deg C. |
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| 8.
Silicone |
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| Excellent
high and low temperature properties. It is not recommended for steam
and many hydrocarbons. |
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| Temp.
Range -70 to 250 deg C. |
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