... crystal, specific gravity: 2.22, slightly soluble inwater (1.8%,30°C), and in nature of hygroscopicity, will be of acidity after ... hydrolyzing.Insoluble in ethanol. when heated to 109°C,it loses crystal water.Quality standard: Name of index FCC ... .0015 Fluorides(As F),% ≤0.005 Loss on drying(60°C) ,% ≤1.0 Lead(Pb ),% ≤0.0005Can supply FCC-V .USES ...