Testing item

Testing standard

appearance

white powder

identification

positive reaction   

loss on drying,w/%

≤4.0 

calcium oxide content,w/%

9.0-10.5   

free acid(in stearic acid),w/%

≤3.0

lead content(Pb)/(mg/kg)

≤2.00   

microbial limit(Internal control indicators)

 bacteria, cfu/g 

≤1000

 mould, cfu/g

≤100

escherichia coli

not detectable