A4726931
Potassium pyrosulfite , 97% , 16731-55-8
CAS NO.：16731-55-8
Empirical Formula: K2O5S2
Molecular Weight: 222.32
MDL number: MFCD00167605
EINECS: 240-795-3
| Pack Size | Price | Stock | Quantity |
| 500g | RMB63.20 | In Stock |
|
| 2.5kg | RMB239.20 | In Stock |
|
| others | Enquire |
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | 190°C |
| Density | 2.34 g/cm3 |
| bulk density | 1000-1300kg/m3 |
| vapor density | 2.3 (vs air) |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: 0.1 M at 20 °C, clear, colorless |
| form | Powder/Solid |
| Specific Gravity | 2.3 |
| color | White to slightly yellow |
| PH | 2.5-4.5 (25℃, 0.1M in H2O) |
| Odor | Odorless |
| PH Range | 3-4.5 at 22.2 g/l at 25 °C |
| Water Solubility | Soluble in water. Insoluble in ethanol. |
| Sensitive | Air Sensitive |
| Decomposition | 150°C |
| λmax | 267nm(H2O)(lit.) |
| Merck | 14,7645 |
| Cosmetics Ingredients Functions | REDUCING HAIR WAVING OR STRAIGHTENING PRESERVATIVE |
| InChI | 1S/2K.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2 |
| InChIKey | RWPGFSMJFRPDDP-UHFFFAOYSA-L |
| SMILES | [K+].[K+].[O-]S(=O)S([O-])(=O)=O |
| EPA Substance Registry System | Disulfurous acid, potassium salt (1:2) (16731-55-8) |
| Absorption | cut-off at 308nm in H2O at 0.1M |
Description and Uses
Potassium Metabisulfite is a chemical preservative and antioxi- dant obtained as white or colorless crystals, powder, or granules. it is soluble in water and insoluble in alcohol. the sulfite salt yields sulfurous acid at a low ph. it is used as a food preservative.
Safety
| Symbol(GHS) |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H318-H335 |
| Precautionary statements | P261-P271-P280-P304+P340+P312-P305+P351+P338-P403+P233 |
| PPE | dust mask type N95 (US), Eyeshields, Gloves |
| Hazard Codes | Xi |
| Risk Statements | 31-36/37/38-41 |
| Safety Statements | 26-36-39 |
| WGK Germany | 1 |
| RTECS | TT4920000 |
| F | 23 |
| TSCA | TSCA listed |
| HS Code | 28322000 |
| Storage Class | 11 - Combustible Solids |
| Hazard Classifications | Eye Dam. 1 |
| Hazardous Substances Data | 16731-55-8(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 2300 mg/kg |
