Acoustical gypsum board panel and method of making it

Details Acoustical gypsum board panel and method of making it Acoustical gypsum board panel and method of making it

2007-05-31

2011-11-15

Choi, Peter Y (Department: 1786)

Stock material or miscellaneous articles

Composite

Of inorganic material

C442S059000, C442S149000, C442S256000, C442S386000, C428S689000, C428S703000, C264S212000, C156S039000, C106S698000, C106S772000

Reexamination Certificate

active

08057915

ABSTRACT:
The acoustical product of the present invention comprises an acoustical product including a matrix of calcium sulfate dihydrate crystals and expanded perlite distributed throughout the matrix. The expanded perlite has a particle size distribution with at least 10% of the perlite having a particle diameter of 700 microns or more, and the amount of expanded perlite to calcium sulfate dihydrate is about 35% to about 75% by weight, based upon the dry weight of the calcium sulfate dihydrate. A dispersing agent and glass fibers having a particle length of about ¼ inch to about 1 inch are dispersed throughout the gypsum matrix.

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