Metal seal / graphite / flexible - Style 606
The Style 606 solid metal gasket with flexible graphite covering is similar to Style 640, which is a plain solid metal gasket. The difference is that the Style 606 is covered with a graphite layer that is flexible. The graphite layer covering acts as a filling for imperfections in the flange face. These imperfections are seen in flanges that do not have proper maintenance.
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