| ≥1 piece |
|
Item
|
Premium grade(%)
|
First grade(%)
|
|
Assay(as H3PO3 )
|
99.0
|
98.0
|
|
Fe (as Fe )
|
0.0012
|
0.005
|
|
chloride(as Cl )
|
0.01
|
0.01
|
|
sulfate(as SO4 )
|
0.006
|
0.006
|
|
phosphate(as PO4 )
|
0.1
|
0.1
|
|
Appearance
|
white crystal
|
white crystal
|
|
Aq.solution test(70%)
|
colorless transparent
|
colorless transparent without any impurities
|