This gasket is identical to the plain solid metal gasket (Style 640), covered with a layer of soft facing material. This covering layer will fill flange face imperfections sometimes found in flanges that have not been properly maintained.

Where bolting force is sufficient, this style gasket is capable of extremely tight make-ups, giving high mechanical strength, good heat conductivity, and resistance to temperature, corrosion, and pressure. This plain solid metal gasket can be supplied in any desired configuration.