... chemical properties:ItemIndexFriability <5Viscosity,mm2/s ≥62Disintegration Time,min ≤10Loss on drying,% ≤12.5~17.5Heavy metals,ppm ≤50Arsenic,pm ≤1Sulfur dioxide ... ,ppm ≤200Residue on ignition,% ≤Transparent2.0Semi-transparent3.0Opaque5.03. Micro-organism testing:Micro ...