Graflon tm:
A blend of Teflon and Graphite for cold sealing and durability between metals expanding at different rates. Works well with head gaskets and intakes when iron block and aluminum heads / intakes are used. Also works well when vacuum tested assembly checks are used.
Nitriphen tm:
A nitrile pheonolic rubber coating used to seal porous gasket materials for longer life and better sealing capability. This coating flows into the small scratches and nicks in mounting surfaces when under pressure for a possitve seal.
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