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SODIUM DITHIONITEICSC: 1717
Sodium hydrosulfite
Sodium hypodisulfite
Disodium hydrosulfite
Sodium hyposulfite
April 2008
CAS #: 7775-14-6
UN #: 1384
EC Number: 231-890-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION 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.   

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS PREVENTION FIRST AID
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 CLASSIFICATION & 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. 

According to UN GHS Criteria

flam;flame
WARNING
Self-heating in large quantities; may catch fire.
May be harmful if swallowed
Causes eye irritation
Harmful to aquatic life 

Transportation
UN Classification
UN Hazard Class: 4.2; UN Pack Group: II 

STORAGE
Dry. Well closed. Separated from strong oxidants and acids. Store in an area without drain or sewer access. 
PACKAGING
 
SODIUM DITHIONITE ICSC: 1717
PHYSICAL & CHEMICAL INFORMATION

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. 

Formula: Na2S2O4
Molecular mass: 174.1
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  


EXPOSURE & HEALTH EFFECTS

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

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

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

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
Symbol: Xn; R: 7-22-31; S: (2)-7/8-26-28-43 

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    See Also:
       Toxicological Abbreviations
       Sodium dithionite (SIDS)