... main content:99% White granular crystal and relative density is 1.083, melting point is 190°C, easy to soluble in ... water and not soluble in alcohol, PH value of 1% water solution is 4.5. Applications: Mainly used as fire ... .20.2Heavy metals,as Pb. % max------0.001Arsenic,as As. % max------0.0003Fluorde,as F. % max------0.005PH4.4-4.64.4-4 ...