Back to results
US 5,472,500 AGranted
High strength, abrasion resistant veneer plaster
AssigneeNational Gypsum Company
InventorEdmund J. Janicki
Life of this patent
Estimating the term…
Abstract
A veneer plaster having strengths of substantially greater than 3,000 psi, abrasion resistance of penetrations less than 0.04 inch with 1,000 cycles of a five-pound brush using a 3M Granule Embedding Testing Machine, made from about 1,800 pounds of calcium sulfate beta hemihydrate, 200 pounds of fine silica sand, and about 4 pounds of a fine, white powder dispersant typified by a melamine-formaldehyde-sodium bisulfite polymer.
Claims20
A veneer plaster composition comprising, in parts by weight based on about 1,778 to about 2,251 parts by weight of the dry composition:
- from about 1,700 to about 1,925 parts by weight of calcium sulfate beta hemihydrate, from about 75 to about 300 parts by weight of silica sand, from about 1 to about 6 parts by weight of a melamine-formaldehyde-sodium bisulfite polymer dispersant, and from about 2 to about 20 parts by weight of additives for improved set and trowelability.
Dependencies are inferred from the claim text.