Sodium Metabisulfite CAS#7681-57-4
Effective Preservative
Sodium metabisulfite is widely used as a preservative in food and industrial applications due to its strong antimicrobial properties.Powerful Reducing Agent
It serves as a reliable reducing agent, helping prevent oxidation in various chemical and manufacturing processes.High Water Solubility
With solubility of 540 g/L at 20 °C, it easily dissolves in water for flexible usage in solutions.Thermal Stability
It remains stable under normal conditions and decomposes only at high temperatures, enabling controlled industrial use.
Sodium metabisulfite (Na2S2O5) is a white crystalline or powdery solid that emits a mild sulfur odor. This compound is highly toxic when inhaled and can cause significant irritation to the skin and mucous membranes upon contact. When exposed to high temperatures, sodium metabisulfite can decompose, releasing toxic sulfur and sodium oxide fumes, which pose serious health risks.
It is commonly used as a preservative and reducing agent in various industrial and food processing applications, but due to its hazardous properties, it must be handled with care. Proper safety measures, such as wearing protective equipment, are essential when working with sodium metabisulfite. Additionally, exposure to its fumes should be avoided in enclosed spaces, and adequate ventilation is recommended to minimize the risk of inhalation.
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 |
