Product Description
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 upon hydrolysis. Its solubility rises noticeably with the increase of temperature, recorded at 54 g/100 mL at 20℃ and 81.7 g/100 mL at 100℃. It is sparingly soluble in ethanol and stable under dry sealed conditions, while susceptible to oxidation and moisture absorption in open air.
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 |
Product Usage
Sodium metabisulfite, an inorganic compound with strong reducing properties, is available in food and industrial grades for diversified scenarios. Food-grade sodium metabisulfite acts as an antioxidant, preservative and bleaching agent, commonly used in fruit and vegetable preservation, wine and beverage production, preventing discoloration and spoilage while complying with relevant food additive regulations. In industrial fields, it is extensively deployed in organic chemical synthesis, pulp bleaching, rubber solidification, water dechlorination and textile bleaching. Additionally, in the pharmaceutical industry, it serves as an important raw material for the production of chloroform, benzaldehyde and various pharmaceutical intermediates.
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