IP Library › Granted Patent US 8,118,928
Granted Patent B1
US 8,118,928 · App. 12/975,574 · Granted Feb 21, 2012

Cast ceiling tile

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Quick Facts
Patent No.
US 8,118,928
App. No.
12/975,574
Granted
Feb 21, 2012
Kind
B1
Abstract

A cast type ceiling tile comprising a mixture containing 30 to 70% mineral wool, 10 to 40% expanded glass beads, 8 to 20% starch, 0 to 15% stucco, and 0 to 1% boric acid.

Claims (4)

1. A cast ceiling tile comprising a mixture containing 30 to 70% mineral wool, 10 to 40% expanded glass beads, 8 to 20% starch, 0 to 15% stucco, and 0 to 1% boric acid, and being the result of evaporating a water content of a viscous cast pulp of said mixture.

2. A cast ceiling tile comprising a mixture containing 50 to 55% mineral wool, 20 to 25% expanded glass beads, 13 to 15% starch, 10 to 12% stucco, and 0 to 1% boric acid, and being the result of evaporating a water content of a viscous cast pulp of said mixture.

3. A cast ceiling tile as set forth in claim 2 , wherein the expanded glass beads have a particle size of about 1 to about 2 mm, and a bulk density of about 14 lbs./ft 3 .

4. A cast ceiling tile as set forth in claim 3 , wherein the tile has a density of about 18 to about 21 lbs./ft 3 .