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SODIUM DITHIONITE
ICSC: 1717
Peer-Review Status: 11.04.2008 Validated
Sodium hypodisulfite
Disodium hydrosulfite
Sodium hydrosulfite
Sodium hyposulfite 
CAS #: 7775-14-6 UN #: 1384
EC #: 016-028-00-1
EINECS #: 231-890-0
    Formula: Na2S2O4
Molecular mass: 174.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames. NO contact with combustible substances or water.  Use carbon dioxide, dry sand, special powder, water in large amounts. 
EXPLOSION      
 
EXPOSURE   PREVENT DISPERSION OF DUST!   
Inhalation Cough. Sore throat.  Use local exhaust or breathing protection.  Fresh air, rest. Seek medical attention if you feel unwell. 
Skin   Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness. Pain.  Wear safety goggles.  Rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention. 
Ingestion Nausea. Abdominal pain. Vomiting. Diarrhoea.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT absorb in saw-dust or other combustible absorbents.   
EC Classification
Symbol: Xn; R: 7-22-31; S: (2)-7/8-26-28-43 
UN Classification
UN Hazard Class: 4.2; UN Pack Group: II 
GHS Classification
Signal: Warning
Self-heating in large quantities; may catch fire.
May be harmful if swallowed
Causes eye irritation
Harmful to aquatic life 
flam;flame

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H2; F1; R2.  Dry. Well closed. Separated from strong oxidants and acids. Store in an area without drain or sewer access. 

IMPORTANT DATA
Physical State; Appearance
WHITE CRYSTALLINE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes above 100°C . This produces toxic fumes including sulfur oxides. The substance is a strong reducing agent. It reacts with oxidants. Decomposes on contact with acids. This produces toxic gases. Contact with water, moisture and moist air may cause spontaneous ignition. 

Occupational exposure limits
TLV not established.
MAK (not established):. 

Routes of exposure
The substance can be absorbed into the body by ingestion. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of short-term exposure
The substance is irritating to the eyes and respiratory tract. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at >100°C
Density: 2.4 g/m³
Solubility in water, g/100ml at 20°C: 25 (moderate)
Flash point: >100°C o.c.
Octanol/water partition coefficient as log Pow: <-4.7  
The substance is harmful to aquatic organisms. 

NOTES
 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       Sodium dithionite (SIDS)