Specification
| Term | Quality Index | |
| Industry Grade | Food Grade | |
| Purity(As Na2SO3) | 96.0%min | 98.0%min |
| Sodium sulphate(SO4) | 2.5%max | 1.5%max |
| Chlorides(As NaCL) | 0.5%max | 0.1%max |
| Arsenic(As) | – | 0.0002%max |
| Heavy metals(As Pb) | 0.0005%max | |
| Iron(Fe) | 0.005%max | 0.002%max |
| Water insolubles | 0.05%max | 0.02%max |
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