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Graphi-Coat™ 623 is a patented titanium diboride based coating that significantly inhibits the oxidation of most commercial grades of graphite to 2000 °F (1093 °C). This two-part system is a water-based, non-volatile material that is applied easily using a brush, roller, dip- or spray-processing.
Graphi-Coat™ is formulated with a weight and volume solids content of 78% and 58%, respectively. The coverage rate at a theoretical dry film thickness of 1 mil is 890 ft²/gal. A minimum dry film thickness of 2.5 mils is recommended. Once applied, Graphi-Coat™ is typically air set for 1-2 hours at ambient temperature then cured in-situ or in 10-15 minutes at 1300 °F.
In addition to coating graphite crucibles and fixtures for metallurgical processing, Graphi-Coat™ 623 can be used to protect graphite electrodes used in arc-melting furnaces.
Graphi-Coat™ 623 is available from stock in pint size containers to five-gallon drums. Please contact Aremco’s sales engineering department for more information about this advanced material.