No. B301

　　Appearance Powder Form

　　Colour White

　　Zinc Sulphite % ≥28

　　Zinc Oxide % ≤1%

　　Moisture ≤0.5%

　　Water Soluble Matter ≤0.5%

　　Residue on sieve 63µm ≤0.1%

　　PH. Value 6.8 - 8.0

　　Oil Absorption ≤14%

　　No. B311

　　Appearance Powder Form

　　Colour White

　　Zinc Sulphite % ≥30

　　Zinc Oxide % ≤0.3%

　　Moisture ≤0.3%

　　105 o C volatile % (m/n) ≤0.3%

　　Water Soluble Matter ≤0.4%

　　Residue on sieve 63µm ≤0.1%

　　PH. Value 6.8 - 8.0

　　Oil Absorption ≤10%

　　Tinting power (compared with standard sample) ≥100%

　　Covering power (contrast ratio) not less than 5% of standard sample (absolute value)