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| Type C |
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| Basic construction style. Suitable for tongue |
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| and groove, male and female or flat face |
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| and recess flanges. |
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| Type C/IR |
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| Identical to the Type C but fitted with the |
| protective inner ring which gives high |
| pressure and temperature capabilities with |
| improved sealing performance. Used on |
| male and female flanges. |
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| Type SG |
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| As Type C but fitted with an external ring |
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| which accurately centralises the sealing |
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| element. In addition the ring provides extra |
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| radial strength and acts as a compression |
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| stop. Generally used on raised face and flat |
| face flanges.Type |
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| Type SG/IR |
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| Identical to the Type SG but also fitted with |
| an inner ring to prevent damage to the |
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| gasket bore and inner windings. It also acts |
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| as a heat shield and corrosion barrier and |
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| improves recovery characteristics and |
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| sealing performance. |
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.png "spiral wound gaskets")
