Composition and method to remove asbestos
AssigneeW. R. Grace & Co.-Conn.
InventorJacob Block
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Abstract
A composition for transforming a chrysotile asbestos-containing material into a non-asbestos material is disclosed, wherein the composition comprises water, at least about 30% by weight of phosphoric acid, and from about 0.1 to about 4% by weight of a source of fluoride ions. A method of transforming the asbestos-containing material into a non-asbestos material using the present composition also is disclosed.
Claims18
A method of treating a cementitious building material containing chrysotile asbestos, wherein said building material has been applied to a substrate in a building, comprising:
- (a) providing an admixture composition derived from admixing (i) water, (ii) at least about 30% by weight of phosphoric acid, and (iii) from about 0.1 to about 4% of a source of fluoride ions;
- (b ) applying said admixture composition to the chrysotile asbestos-containing building material;
- (c) permitting said admixture composition to penetrate the building material and contact the chrysotile asbestos contained therein;
- (d) allowing said composition to remain in contact with the chrysotile asbestos containing building material for a sufficient period of time to reduce the amount of chrysotile asbestos contained therein to less than 1% by weight of the treated material.
A composition capable of transforming an asbestos-containing material to a cementitious material containing less than 1% by weight of chrysotile asbestos, comprising a mixture of (a) water, (b) phosphoric acid, and (c) a source of fluoride ions;
- wherein the phosphoric acid is present in a concentration of from at least about 30 weight percent of the composition and the source of fluoride ions is present in a concentration of from about 0.1 to about 4 weight percent of the composition.
Dependencies are inferred from the claim text.