Patent ID: 6158176
Filing Date: 2000-12-12
Classification: E04B,Y10T

Abstract:
A core for the production of a rectangular acoustic panel, said core comprising:a) a shape-retaining, self-supporting mat of rockwool bounded by flat front and rear surfaces and four straight perimeter edges disposed in a rectangular array, said mat having a density between 5 and 9 pounds per cubic foot (lbs./cu.ft.), a thickness between 0.75 and 2.0 inches, and a binder content of between 3% and 5% by weight of said mat, andb) a sheet of non-woven interbonded fiberglass adhered to at least one flat surface of said rockwool mat, said sheet having a thickness between 20 and 30 mils and a weight between 0.75 and 3.0 ounces per square foot.