1. Properties: white crystalline powder, hygroscopic. Dissolved in acid, sodium thiosulfate and ammonium salt solution, slow dissolve in glycerin, almost insoluble in alcohol and most organic solvents. 2, application properties and suggestions:? (1) This product is used as a filler in paint, which does not affect the transparency film, filled with good, low oil absorption, open cans perception and good, mainly used in PU, PE, NC and other transparent primer. ?? (2) of this product compared to talc, precipitated in the coating system easier, more difficult to polish, should pay attention to test and polish of its precipitation. In PU primer recommended and will greatly improve with the use of talcum powder paint and sanding after dilution of anti-settling properties. ?? (3) The product has strong moisture absorption, add this product coating system should pay particular attention to the painting, sanding after the primer paint finish as soon as possible should avoid this product moisture. Meanwhile recommended a ban on water polished. This product, although it contains crystal water, but the water does not precipitate crystals at room temperature. A large number of experiments show that adding this product appear whitish film is coated to absorb moisture absorption stage caused. ?