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This one-page product data sheet covers Urethane Brush-Grade 522, a high-solids, single-component, moisture-cure polyurethane elastomeric coating formulated as a thick mastic for bridging gaps. It is listed for Ure-A-Sil, Ure-A-Max, Met-A-Gard+ and Met-A-Sil, and the number PDS-080825 is printed at the top.
The sheet describes the product as developed from Aromatic Urethane 520 for waterproofing with that coating and other American WeatherStar products. It names EPDM, single-ply membranes, concrete, masonry, metal, modified bitumen and polyurethane foam as surfaces it protects, and it mentions emergency repairs after hail damage.
Application is by heavy brush, as received, with thinning up to 6% by volume with xylene if viscosity increases. Applied coatings cure in about 24 hours at 60°F and 40% relative humidity, with longer cure times at lower temperatures and humidity. The technical data lists 69% plus or minus 2 solids by volume, 350% plus or minus 50% elongation, 975 plus or minus 25 psi tensile strength, and 30,000 to 40,000 cps viscosity. It also gives 9.2 pounds per gallon, a flash point of 80°F, Shore A hardness of 65, and a service range of -50°F to 200°F. Shelf life is 18 months, color is silver, and packaging is 5-gallon, 1-gallon and 20-ounce tube sizes.
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