International Chemical Safety Cards SODIUM DISULFITE ICSC: 1461 Disodium disulfite Disodium pyrosulfite Sodium metabisulfite Na2O5S2 Molecular mass: 190.1 ICSC #    1461 CAS #     7681-57-4 RTECS # UX8225000 EC #         016-063-00-2 November 10, 2002 Validated TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible. In case of fire in the surroundings: use appropriate extinguishing media. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Cough. Wheezing. Local exhaust or breathing protection. Fresh air, rest.  •SKIN Protective gloves. First rinse with plenty of water, then remove contaminated clothes and rinse again.  •EYES Redness. Pain. Safety goggles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Abdominal pain. Diarrhoea. Nausea. Vomiting. Do not eat, drink, or smoke during work. Rinse mouth. Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Do NOT absorb in saw-dust or other combustible absorbents. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. (Extra personal protection: P2 filter respirator for harmful particles.) Do NOT let this chemical enter the environment. Separated from acids, and strong oxidants. Xn symbol R: 22-31-41 S: 2-26-39-46 SEE IMPORTANT INFORMATION ON BACK ICSC: 1461 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards SODIUM DISULFITE ICSC: 1461 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE POWDER PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing sulfur oxides . The substance is a strong reducing agent and reacts with oxidants. Reacts violently with concentrated solution of sodium nitrite. The substance decomposes on contact with acids producing sulfur oxides . OCCUPATIONAL EXPOSURE LIMITS: TLV: 5 mg/m³ as TWA; A4; (ACGIH 2002). OSHA PEL†: none NIOSH REL: TWA 5 mg/m3 NIOSH IDLH: N.D. See: IDLH INDEX ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: The substance is irritating to the eyes , the respiratory tract and is severely irritating to gastrointestinal tract . Inhalation of the substance may cause asthma-like reactions. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Decomposes below melting point at 150°C Density: 1.4 g/cm³ Solubility in water, g/100 ml: 54 good ( ) Octanol/water partition coefficient as log Pow: -3.7 ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. N O T E S Rinse contaminated clothes (fire hazard) with plenty of water. Anyone who has shown symptoms of asthma due to this substance should avoid all further contact. The symptoms of asthma often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. ADDITIONAL INFORMATION ICSC: 1461 SODIUM DISULFITE (C) IPCS, CEC, 1994

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.