Product Specification 

SUBSTANCE: Sodium Metabisulphite

CHEMICAL FORMULA: Na2S2O5

APPEARANCE: Fine, white granular material. 

PHYSICAL STATE: Solid. 

ODOR: Pungent sulfur dioxide odor. 

MOLECULAR WEIGHT: 190.11 

RELATIVE DENSITY (water = 1.0): 1.48 

SOLUBILITY IN WATER (weight %): 39% at 16°C (60.8°F) 

pH: 1% solution – 4.3 

MELTING/FREEZING POINT: Begins to rapidly decompose above 150°C (302°F)

VAPOR DENSITY (air = 1.0): Not applicable. 

HAZARDOUS INGREDIENTS INFORMATION COMPONENT:

CAS-No.: 7681-57-4

EC-No.: 231-673-0

Acute Health Effects

Inhalation: Inhalation of dust or mist can irritate the respiratory tract. May cause severe or deadly allergic reactions in some asthmatics and sulfite sensitive individuals. Possible signs and symptoms of allergic reactions include bronchoconstriction, sweating, flushing, hives, rapid heart rate, decreased blood pressure, and anaphylaxis. Contact with acids, water and/or ice, releases sulfur dioxide gas which may be harmful or deadly if inhaled.

Skin contact: Repeated or prolonged contact with dust may cause irritation. Contact with solutions will cause skin irritation and possibly burns.

Ingestion: May irritate the gastrointestinal tract. May cause severe or deadly allergic reactions in some asthmatics and sulfite sensitive individuals. Very large doses may cause violent colic, diarrhea, depression, and even death.

Eye contact: Dust or mist may irritate or burn the eyes. Solutions will irritate or burn. Permanent eye injury is possible.

EMERGENCY AND FIRST AID PROCEDURES 

Inhalation: Remove to fresh air. Get immediate medical attention if signs of suffocation, irritation, difficulty breathing, or other symptoms develop.

Skin contact: Wash skin with plenty of soap and water. Remove contaminated clothing and launder before reuse. Get medical attention if irritation persists.

Ingestion: Rinse mouth with water and give 1 glass of water to drink. Do not induce vomiting unless directed to do so be medical personnel. Get medical attention if symptoms develop.

Eye contact: Flush eyes immediately with water for at least 15 minutes. Remove contact lenses if present after the first 5 minutes if you can do so easily and continue flushing. Get immediate medical attention.