Sodium Metabisulfite CAS#7681-57-4
High Water Solubility – Easily dissolves in water, with solubility of 54 g/100 mL at 20℃ and 81.7 g/100 mL at 100℃.
Versatile Physical Form – Available as white or slightly yellow crystalline powder or small crystals, suitable for various applications.
Reliable Density and Stability – Has a consistent density of 1.48 g/cm³, ensuring uniform performance in formulations.
Acidic Aqueous Solution – Forms an acidic solution when dissolved in water, providing useful chemical properties for industrial processes.
Sodium metabisulfite is a widely utilized inorganic compound, typically appearing as a white or slightly yellow crystalline powder or small crystals with a strong sulfur dioxide odor. It has a density of 1.48 g/cm³ and is highly soluble in water, forming an acidic aqueous solution. Its solubility is 54 g/100 mL at 20℃ and increases to 81.7 g/100 mL at 100℃.
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 | 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 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 serves in the synthesis of chemicals, paper bleaching, and rubber solidification. In the pharmaceutical field, it can be utilized as a raw material for producing chloroform, benzaldehyde, and other drugs.
