Abstract: This invention presents a preparation of expanded silicate-based aggregates as useful in a method for absorbing hazardous liquid materials. This expanded silicate-based aggregate material has previously been known for use as insulation, fireproof wallboard and insulating blocks, high temperature pipe covering, fire proofing of steel structures, marine deck filler and for cement block in non-bearing fire walls, but not for absorbing hazardous liquids. The present invention uses this aggregate material, either alone or mixed with a solution of five to seven percent of polyvinyl chloride in a solvent comprising 15% dimethylsulfoxide and 85% methylethyl ketone providing a paste which may be placed on a hazardous liquid material and within seconds will absorb the hazardous material throughout the thick paste material.

Abstract: A known expanded silicate-based aggregate described in the U.S. Pat. No. 3,719,510, granted Mar. 6, 1973 to Ralph E. Temple and William T. Gooding is mixed with a slurry consisting of 5 to 8 percent polyvinyl chloride in a water-free solvent comprising 15 percent dimethylsulfoxide and 85 percent methylethyl ketone to provide a pourable and settable insulation. Blocks of such insulation are lightweight but will not break down upon handling, are non-combustible, have a high heat insulation factor, and are not attacked by the acids or distillates commonly used in forming a roof covering.