Sodium Metabisulfite CAS#7681-57-4
Sodium metabisulfite is a widely used inorganic compound, typically appearing as a white or slightly yellowish crystalline powder or small crystals, with a pronounced sulfur dioxide odor. It has a density of 1.48 g/cm³ and is highly soluble in water, forming an acidic solution. Its solubility in water is 54 g/100 mL at 20℃ and 81.7 g/100 mL at 100℃.
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Sodium metabisulfite Chemical Properties
| Melting point | >300 °C (lit.) |
| density | 1.48 |
| bulk density | 1000-1200kg/m3 |
| refractive index | 1.474 |
| storage temp. | Store at +5°C to +30°C. |
| solubility | 540 g/L (20°C) |
| form | Powder/Solid |
| Specific Gravity | 1.48 |
| color | White to slightly yellow |
| PH | 3.5-5 (50g/l, H2O, 20℃) |
| Odor | Sulphorous |
| PH Range | 4.5 at 50 g/l at 20 °C |
| Water Solubility | 540 g/L (20 ºC) |
| Sensitive | Air & Moisture Sensitive |
| Merck | 148638 |
| Exposure limits | ACGIH: TWA 5 mg/m3 |
| NIOSH: TWA 5 mg/m3 |
| Stability: | Stable. Incompatible with strong oxidizing agents, strong acids. Contact with strong acids releases a poisonous gas. May be moisture and air sensitive. |
| InChIKey | HRZFUMHJMZEROT-UHFFFAOYSA-L |
| CAS DataBase Reference | 7681-57-4(CAS DataBase Reference) |
| EPA Substance Registry System | Sodium metabisulfite (7681-57-4) |
| Hazard Codes | Xn,Xi |
| Risk Statements | 22-31-41-36/37/38-52 |
| Safety Statements | 26-39-46-36-16 |
| RIDADR | 3260 |
| OEB | B |
| OEL | TWA: 5 mg/m3 |
| WGK Germany | 1 |
| RTECS | UX8225000 |
| TSCA | Yes |
| HS Code | 2832 10 00 |
| PackingGroup | III |
| Hazardous Substances Data | 7681-57-4(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 1540 mg/kg LD50 dermal Rat > 2000 mg/kg |
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Product Usage
Sodium metabisulfite, an inorganic compound with strong reducing properties, is used in food-grade applications as an antioxidant, preservative, and bleaching agent. In industrial-grade applications, it is employed in chemical synthesis, paper bleaching, and rubber solidification. Additionally, in the pharmaceutical field, it serves as a raw material for producing chloroform, benzaldehyde, and other drugs.
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