Sodium Metabisulfite
Products Description of Sodium metabisulfite CAS#7681-57-4
Sodium metabisulfite (chemical formula: Na₂S₂O₅) is a white crystalline or powdery solid that has a faint sulfur odor. It is toxic if inhaled and can cause severe irritation to the skin and body tissues. When exposed to high temperatures, it decomposes and releases toxic fumes of sulfur oxides and sodium oxides.
Parameters
Melting point | >300 °C (lit.) |
bulk density | 1000-1200kg/m3 |
density | 1.48 |
refractive index | 1.474 |
storage temp. | Store at +5°C to +30°C. |
solubility | 540 g/L (20°C) |
form | Powder/Solid |
color | White to slightly yellow |
Specific Gravity | 1.48 |
Odor | Sulphorous |
PH | 3.5-5 (50g/l, H2O, 20℃) |
PH Range | 4.5 at 50 g/l at 20 °C |
Water Solubility | 540 g/L (20 ºC) |
Sensitive | Air & Moisture Sensitive |
Merck | 14,8638 |
Exposure limits | ACGIH: 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) |
Safety Information
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 Application of Sodium metabisulfite CAS#7681-57-4
Sodium metabisulfite (CAS No. 7681-57-4) has strong reducibility, making it widely used in food, chemical industry, medicine, and other fields. In the food industry, it acts as an antioxidant, preservative, and bleaching agent, applied to products like meat, wine, and preserved fruits. In the chemical industry, it’s used in textile printing and dyeing, papermaking and pulping, water treatment, and leather softening. In medicine, it serves as a pharmaceutical intermediate and an antioxidant for injections. It also has applications in photography, rubber production, and agriculture.
Notably, it releases toxic sulfur dioxide when in contact with acids. For storage, it must be kept in a sealed container in a cool, dry place, and kept away from acids and oxidants.
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