Pyro-Paint™ 634-AS is an alumina-silica, fiber-reinforced, ceramic coating used to bond, coat and seal graphite and refractory materials used in molten metal fluid handling components and structures in foundry applications to 2300 oF (1260 °C). A new application for Pyro-Paint™ 634-AS is the insulation of graphite impellers used in the handling of molten aluminum; the 634-AS prevents wear and oxidation of the graphite at the melt line.
Pyro-Paint™ 634-AS is rated for temperatures up to 2300 oF (1260 °C) and exhibits exceptional adhesion to graphite, ceramic cloth and fiberboard. Pyro-Paint™ is resistant to wetting by non-ferrous molten metals, increasing the durability, erosion resistance and reliability of the underlying structure.
Pyro-Paint™ 634-AS is formulated with a solids content of 61.2% by weight and 63.3% by volume to a viscosity range is 400-700 cP. It is applied typically by brush, roller or conventional spray equipment. Dry films from 2-3 mils up to 3/8″ can be produced without cracking.
Pyro-Paint™ 634-AS is a simple to use, environmentally friendly, water-based formulation containing no volatile organic compounds. It dries at room temperature in several hours and cures fully within 2 hours at 200 oF.
Pyro-Paint™ 634-AS is part of a line of refractory coatings based on ceramic fillers including boron nitride, carbon, graphite, yttrium oxide, and zirconium oxide. Please contact Aremco’s Technical Sales Department for complete details about this advanced new product.