Patent ID: 7842629
Filing Date: 2010-11-30
Classification: B28B,B32B,C04B,E04C,Y10T

Abstract:
1. A gypsum board, comprising: a. a gypsum layer having a first face and a second face and comprising set gypsum; and b. first and second facers affixed to said first and second faces, said first facer being a fibrous mat comprising a non-woven web bonded together with a resinous binder, and said web comprising a blend of a major portion composed of chopped glass fibers having an average fiber diameter of about 11±1.5 μm and a minor portion composed of fine staple fibers having an average fiber diameter of less than about 5.5 μm, said minor portion being composed of glass or mineral fibers and comprising about 1-30 percent of the dry weight of the web, and wherein said mat has a permeability of at least about 300 cfm/ft