Coated silica gel used for chemical agents grouped into the following eight categories: (1) insoluble metal soap dispersions; (2) water-soluble soap; (3) sulfated or sulfonated oils; (4) fatty acid esters ; (5) wax, polyethylene, or other hydrocarbon emulsion type; (6) fatty amine or amide (synthetic wax) class; (7), polyethylene glycol and polyethylene glycol ethers; (8) esters of soybean lecithin "oleic acid mixture.