Patent ID: 7914761

Claim:
A composition comprising: hydrogen fluoride in an amount of from about 80 weight percent of the composition to about 98 weight percent of the composition; and a cross-linked copolymer in an amount from about 0.5 weight percent of the composition to about 20 weight percent of the composition, the cross-linked copolymer comprising acrylamide units cross-linked with an acrylic acid salt, wherein said acrylic acid salt is selected from the group consisting of potassium acrylate, sodium acrylate, and ammonium acrylate, wherein said cross-linked copolymer has an average liquid hydrogen fluoride adsorption capacity of at least about 45.2 prams of HF per gram of the cross-linked copolymer, and wherein the composition is in the form of a solid or a gel.