Patent ID: 7829488
Filing Date: 2010-11-09
Classification: D21H,E04C,Y10T

Abstract:
1. A gypsum board, comprising: a. a gypsum layer having a first face and a second face and comprising set gypsum; b. first and second facers affixed to said first and second faces, said first facer being an uncoated fibrous mat comprising a non-woven web bonded together with a resinous binder that includes a cross-linker in an amount ranging up to about 10 weight percent, and said web comprising glass fiber consisting essentially of a blend of a major portion of chopped glass fibers, said major portion consisting essentially of about 65-75% by weight of glass fiber having an average fiber diameter of about 16 μm and an average fiber length of about ½ inch and about 15-20% by weight of glass fiber having an average diameter of about 16 μm and an average fiber length of about 1 inch, and a minor portion consisting essentially of about 15-25% by weight of microfibers, substantially all of which have a fiber diameter in the range from about 2.7 to 3.4 μm, and wherein said first facer has a hydrophobicity such that it absorbs no more than three times its weight in water when tested in accordance with INDA Standard Test 10.1.