Typical Analyses FPA-D (CaSO4 .2H2O) Total calcium 23.0% CaO 32.1% SO3 46.0% CaSO4 0.30% CaSO4 .2H2O 99.0 CaCO3.MgCO3 0.2% SiO2 and insolubles 0.24% Fe2O3.Al2O3 0.12% 250°C water loss 20.70% Brightnes 97.0 Oil absorption 26.5 Specific gravity 2.96 loose bulk density 44.0 Compacted bulk density 68.0 Bulking values 24.43 Solubility(70°F) per 100cc of H2O0.26 PH(10%slurry)7.3 Refractive index1.52 Through 200 mesh (min)100 Through 325 mesh(min) 97 Avg. particle size(microns) 7-9