|
Item
|
Specification
|
|
|
|
Food Grade
|
Tech Grade
|
|
Appearance
|
White or Slightly Yellow Crystalline Powder
|
|
|
Content
|
98.0% Min
|
98.0% Min
|
|
SO2
|
65.0% Min
|
65.0% Min
|
|
Na2S2O4
|
2.0% Max
|
2.0% Max
|
|
Insolubles In Water
|
0.05% Max
|
0.05% Max
|
|
Particle Size
|
85% (Mesh 200)
|
85% (Mesh 200)
|
|
pH
|
4.5 -5.5
|
4 -4.6
|
|
Fe
|
5ppm max
|
5ppm max
|
|
Heavy Metal
|
10 ppm max
|
|
|
As
|
1ppm max
|
|
