Propyl Gallate. Assay: 98% min. Molecular formula: C10H12O5. Standard: USP26 Items Specification Results Assay 98%-102% min 99.94% Loss on drying 0.5% max 0.14% Melting point 146-150oC 147.4-149.5 oC Heavy metal 10ppm max complies As 3ppm max complies Zn 25ppm max complies Organic volatile conforms complies Sulphate 0.1% max 0.026% Chlorides 100ppm max complies Total chlorine 200ppm max complies