| Item | A Grade | B Grade | C Grade |
| Main Content(based on H3PO3 ) (%) | ≥ 99.0 | ≥ 98.5 | ≥ 97.0 |
| Chloride Content(based on CL) (%) | ≤ 0.001 | ≤ 0.01 | ≤ 0.02 |
| Iron Content(based on Fe) (%) | ≤ 0.0005 | ≤ 0.001 | ≤ 0.005 |
| Phosphate Content(based on PO4) (%) | ≤ 0.1 | ≤ 0.2 | ≤ 0.6 |
| Sulfate Content(based on SO4) (%) | ≤ 0.0005 | ≤ 0.008 | ≤ 0.01 |
| Appearance | Pure white crystal | White crystal | White crystal |
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Phosphorous acid, molecular formula H3PO3, colorless crystal, is one of the oxyacids of phosphorus and is a weak binary acid. Phosphorous acid has reducibility and can easily reduce Ag+ to metal silver. It can also reduce sulfuric acid to sulfur dioxide. It is corrosive and has hygroscopicity.
| Item | A Grade | B Grade | C Grade |
| Main Content(based on H3PO3 ) (%) | ≥ 99.0 | ≥ 98.5 | ≥ 97.0 |
| Chloride Content(based on CL) (%) | ≤ 0.001 | ≤ 0.01 | ≤ 0.02 |
| Iron Content(based on Fe) (%) | ≤ 0.0005 | ≤ 0.001 | ≤ 0.005 |
| Phosphate Content(based on PO4) (%) | ≤ 0.1 | ≤ 0.2 | ≤ 0.6 |
| Sulfate Content(based on SO4) (%) | ≤ 0.0005 | ≤ 0.008 | ≤ 0.01 |
| Appearance | Pure white crystal | White crystal | White crystal |
1. It is the raw material for manufacturing phosphite, and also the raw material for manufacturing plastic stabilizers (such as dibasic lead phosphite) and organophosphorus pesticides. Used as a stabilizer for polycarbonate. Also used as an antioxidant for nylon 1010.
2. Used as a chemical reagent
3. Water treatment
25kg/500kg/1000kg in woven bag lined with double layer polythene bag
Flammability hazard characteristics:
In case of H, the pore-forming agent is flammable; when heated, it decomposes toxic phosphorus oxide fumes
Storage and transportation characteristics:
The warehouse is ventilated, low-temperature and dry; store it separately from H pore-forming agent and alkali.
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