item	Standard
	B301	B311
Ba+SO4(as ZnS)%(m/m)≧	99	99
Zinc(as ZnS)(m/m)≧	28	30
Zinc Oxide%(m/m) ≦	0.6	0.3
105℃ volatile%(m/m)≦	0.3	0.3
Water Soluble%(m/m)≦	0.4	0.3
Screen residues(63um mesh)%(m/m)≦	0.1	0.1
Oil absorption g/100g≦	14	10
Color killing(compare with standard specimen)%≧	105	105