"appearance white or off-white powder, no odor no taste
identification meet the requirements
granulometry remains 60 mesh ≤1%
remains 200 mesh ≤30%
conductivity ≤75us/cm
ph value 5.0~7.5
loss on drying 7.0% max
residue on ignition 0.1% max
water soluble substances 0.25% max
ether soluble substances 0.05% max
bulk density(g/ml) 0.28~0.38
heavy metal (pb) 10ppm max
dp 200~300
microbial limits total aerobic microbial count ≤1000cfu/g
total combined molds and yeasts count ≤100cfu/g
escherichia coli absence
salmonella species absence
staphylococcus aureus absence
pseudomonas aeruginosa absence"