USG's Sheetrock Mold Tough UltraLight Gypsum Drywall Panels are tested in accordance with ASTM D3273, Standard Test Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber. These gypsum panels meet or exceed ASTM C1396 specifications. The ends of the panels are cut square and even, while the the long edges are tapered, allowing joints to be reinforced and concealed with Sheetrock joint treatment systems.
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