≥1 piece |
No.
|
Index
|
Industrial grade
|
Food grade
|
1
|
Main content %≥
|
98.0
|
98.0
|
2
|
P 2 O 5 %≥
|
58.0
|
58.0
|
3
|
pH of 1% water solution
|
4.2-4.8
|
4.2-4.8
|
4
|
Water insoluble %≤
|
0.1
|
0.1
|
5
|
Heavy metal, as Pb %≤
|
-
|
0.001
|
6
|
Arsenic, as As %≤
|
-
|
0.0003
|
7
|
Fluoride, as F %≤
|
-
|
0.002
|
8
|
Sieve test (Through 60 mesh)%≥
|
90.0
|
90.0
|