Corrosion inhibiting composition for treating asbestos containing materials
AssigneeW. R. Grace & Co.-Conn.
InventorJudithann Ruth Hartman
Life of this patent
Estimating the term…
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 an acid component, optionally a source of fluoride ions, and a corrosion inhibiting amount of thiourea, a lower alkylthiourea, a C.sub.8 -C.sub.15 alkylpyridinium halide or mixtures thereof. A method of transforming an asbestos-containing building material, while part of a building structure, into a non-asbestos material by using the present composition also is disclosed.
Claims7
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 by admixing (i) water, (ii) at least about 30% by weight of an inorganic acid, an inorganic acid salt or mixtures thereof, and (iii) a corrosion inhibiting amount of a corrosion inhibiting component selected from the group consisting of thiourea, lower alkylthioureas, C.sub.8 -C.sub.15 alkylpyridinium halides and mixtures thereof;
- (b) applying said admixture composition to the chrysotile asbestos-containing building material;
- (c) permitting said admixture composition to penetrate into the building material and contact the chrysotile asbestos contained therein;
- and
- (d) allowing said composition to remain in contact with the chrysotile asbestos for a sufficient period of time to reduce the amount of chrysotile asbestos contained therein to less than 1% by weight.
Dependencies are inferred from the claim text.