☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆ solubilised sulphur black qualitysdard gb/t 25808-2010 appearance black uniform powder black br light intensity 100±5 stength approximate to the standard insoluble impurities content in water% ≤0.5% moisture content ≤0.7% fineness(through the250um sieve residue content%) ≥60 fineness(through the590um sieve residue content%) ≤2% add：no.1 linxia road,meihua yuan district,xiangjiang,yuncheng,shanxi,china tel：0359-7698399/7698388 call：/18635929292 fax:0359-7698398 zip code:043100 shanxi yinchang chemical co., ltd welcome to yinchang