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Date of Issue : Feb 2001 1. IDENTIFICATION
General Product Name : SODIUM THIOSULPHATE Other Names : SODIUM HYPOSULPHITE ; SODIUM SUBSULPHITE UN No. : N/A Dangerous Goods Class : None Allocated Subsidiary Risk : None Allocated Hazchem Code : N/A Pack Group : 0 EPG : N/A Poisons Schedule : N/A Uses : Photography (fixing agent to dissolve unchanged silver salts from exposed negatives), chrome tanning, removing chlorine in bleaching and papermaking, extraction of silver from its ores, dechlorination of water, mordant, reagent, bleaching, reducing agent in chrome dyeing, sequestrant in salt (up to 0.1%), antidote for cyanide poisoning.
1.1 Physical Description / Properties
Appearance : White, translucent crystals or powder, cooling taste and bitter after taste, hygroscopic Formula : Na2S2O3.5HOH Boiling Point : > 100 deg C Melting Point : 48.5 deg C Vapour Pressure : N/A Specific Gravity : 1.729 (water = 1) Flash Point : N/A pH : N/A () Solubility in water : 680 g/l (25 deg C) Flammability Limits (as percentage volume in air) Lower Explosion Limit : N/A Upper Explosion Limit : N/A 1.2 Other Properties
Soluble in water and oil of turpentine, insoluble in alcohol, deliquescent in moist air, efflorescent above 33 deg C in dry air. 1.3 Ingredients
2. HEALTH HAZARD INFORMATION
2.1 Health Effects - Acute Swallowed
Low level of toxicity by ingestion. Large amounts may cause gastrointestinal irritation and diarrheoa. Eye
May cause mechanical eye irritations. Skin
Prolonged and/or repeated contact may cause irritation and/or dermatitis. Inhaled
May cause irritation to the respiratory tract. Symptoms may include coughing and shortness of breath. 2.2 Health Effects - Chronic
Chronic exposure may cause skin effects.
2.3 First Aid
Swallowed
Induce vomiting immediately as directed by medical personnel. Never give anything by mouth to an unconscious person. Seek medical attention.
Eye
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower lids. Seek medical attention.
Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Seek medical attention if irritation develops or persists.
Inhaled
Remove victim from exposure. Avoid becoming casualty. If effects persist seek medical attention.
First Aid Facilities
Ensure an eye bath and safety shower are available and ready for use.
2.5 Advice to Doctor
Treat symptomatically based on individual reactions of patient and judgement of doctor.
2.6 Toxicity Data
Oral LD50 = 2700 mg/kg (Rat) Oral LDLo = 300 mg/kg/7D Dermal LD50 = not available Inhalation LC50 = not available
3. PRECAUTIONS FOR USE
3.1 Exposure Standards
No exposure limit has been set for this product. However, a precautionary limit of 10 mg/m3 for nuisance dusts should be observed.
3.2 Engineering Controls
In general, dilution ventilation is satisfactory health hazard control for this substance. However, if conditions of use create discomfort to the worker, a local exhaust system should be considered.
3.3 Personal Protection
Respiratory - wear an approved respirator in heavy dust conditions. Eyes - wear appropriate protective eyeglasses or chemical safety goggles Skin - Wear impervious gloves. Clothing - wear appropriate protective gloves and clothing to prevent skin contact. Wash hands and face thoroughly after handling and before eating, drinking, smoking or using the toilet.
3.4 Flammability
Material is not flammable. SAFE HANDLING INFORMATION
4.1 Storage / Transport
Store in a cool, dry area away from direct heat. Avoid acids and strong oxidants. Avoid storage with sodium nitrite.
4.2 Packaging / Labelling UN No. N/A Class None Allocated Sub Risk None Allocated Hazchem Code N/A Pack Group 0 EPG No. N/A Shipping Name SODIUM THIOSULPHATE Hazard
Risk Phrases
Safety Phrases
4.3 Spills and Disposal
Spills
Ensure appropriate protective gear is worn.
Sweep up or shovel spill into a suitable container for reclammation or disposal. Vacuuming or wet sweeping may be used to avoid dust dispersal.
Disposal
Dispose of residues and washings in accordance with all Local, State and Federal regulations at an approved waste disposal facility.
4.4 FIRE AND EXPLOSION HAZARD Fire / Explosion
Material may decompose in a fire. When heated to decomposition emits very toxic fumes of Na2O and SOx. Incompatible with acids, iodine, lead salts, mercury and silver. Reacts violently with sodium nitrite. Hazardous decomposition products include hydrogen sulphide and sodium oxide.
Extinguishing Media
Use carbon dioxide, dry chemical powder, alcohol or polymer foam. 5 OTHER INFORMATION
Other Information
No data available
5.1 Contact Points
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The information above is believed to be accurate and represents the best information currently available to us. However, we make no warranty of merchantability or any other warranty, express or implied, with respect to such information, and we assume no liability resulting from its use.
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