Pyro-Painttm 634-AL is a two-part, 99% alumina filled, ceramic coating system used to bond, coat and seal refractory fiber boards and other shapes used in molten metal fluid handling components and structures in foundry applications to 3200 °F (1760 °C). The advanced material helps to prevent wear and oxidation of refractory components and increases heat reflectivity to improve thermal efficiency and enable temperatures to ramp up more rapidly.
Pyro-Painttm 634-AL is rated for temperatures up to 3200 oF (1760 °C) and exhibits exceptional adhesion to refractory fiberboards as well as alumina, graphite and ceramic cloth. Pyro-Painttm is resistant to wetting by most molten metals, increasing the durability, erosion resistance and reliability of the underlying structure.
Pyro-Painttm 634-AL is formulated as a two-part system consisting of a liquid binder system and powder filler. Mix ratio is 3:1 powder to liquid by weight but this ratio can be modified to vary the viscosity. Mixed in a 3:1 ratio, the material has a solids content of 76.8% by weight and 66.0% by volume and a viscosity range of 5,000 to 6,000 cps. It is typically applied using a brush, roller or conventional spray equipment. Dry films from 2-3 mils up to 3/8″ can be produced without cracking.
Pyro-Painttm 634-AL 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-Painttm 634-AL is part of a line of refractory coatings based on ceramic fillers including alumina-silica fibers, boron nitride, carbon, graphite, yttrium oxide, and zirconium oxide. For complete details about Pyro-Painttm, please contact Aremco’s Technical Sales Department.