MATERIAL SAFETY DATA SHEET SODIUM THIOSULPHATE
PRODUCT CODE NUMBER(S):8460-1
PRODUCT IDENTIFICATION Hazardous Decomposition Products: SOx, hydrogen sul-
phide
Chemical Name and Synonyms: Sodium thiosulphate
Pentahydrate; Hypo; Sodium hyposulphite FIRE AND EXPLOSION DATA
Chemical Family: Inorganic salt
Flammability: Non flammable. Releases toxic, irritating or
Chemical Formula: Na2S2O3.5H2O
flammable gases and residue when heated.
Product Use: Laboratory reagent Extinguishing Media: Use an extinguisher appropriate to
Manufacturer鈥檚 Name and Address: the surrounding material that is burning. Use water spray to
Caledon Laboratories Ltd. cool fire exposed containers, and to disperse fumes. Fight
fire from upwind, from a safe distance. FIrefighters must
40 Armstrong Avenue
wear full face-piece, positive-pressure self-contained breath-
Georgetown, Ontario L7G 4R9
ing apparatus and protective clothing sufficient to prevent
Telephone No: (905) 877-0101
inhalation of fumes and contact with skin and eyes.
Fax No: (905) 877-6666 Flash Point (Method Used): Not applicable
Emergency Telephone No: CANUTEC (613) 996-6666 Autoignition Temperature: Not applicable
Upper Flammable Limit (% by volume): Not applicable
HAZARDOUS INGREDIENTS OF MATERIALS
Lower Flammable Limit (% by volume): Not applicable
Ingredients % TLV Units CAS No. Hazardous Combustion Products: SOx, hydrogen sul-
phide, flammable, irritating sodium sulphide residue.
Sodium thiosulphate
Sensitivity to Impact: None identified
pentahydrate >99 Not established 10102-17-7
Sensitivity to Static discharge: None identified
PHYSICAL DATA
TOXICOLOGICAL PROPERTIES AND HEALTH DATA
Physical State: Solid
Toxicological Data:
Odour and Appearance: Colourless or white crystals;
odourless LD50: (oral, rat) >8 g/kg
Odour Threshold (ppm): Not applicable
LDLO (ivn, mus) 32,350 mg/kg
Vapour Pressure (mm Hg): Not applicable
LC50: Not available
Vapour Density (Air = 1): Not applicable
Evaporation Rate: Not applicable Effects of Acute Exposure to Product:
Boiling Point (degrees C): >100掳C (loses water)
Inhaled: May cause irritation of the nasal and respiratory
Melting Point (degrees C): 40-45掳C passages. Sulphur dioxide, and hydrogen sulphide, which
pH: 5.5-7.5 (5% solution) are released when the product is heated, are highly irritating
and toxic. Extent of irritation depends on the concentration
Specific Gravity: 1.685
the duration of exposure.
Coefficient of Water/Oil distribution: Not available
In contact with skin: Dust may cause irritation with itching,
.
redness, tearing. Solutions may irritate or burn depending
SHIPPING DESCRIPTION on the concentration and the duration of contact.
In contact with eyes: Dust causes severe irritation. Solu-
UN: Not regulated
tions may irritate or burn depending on the concentration
T.D.G. Class: Not regulated
and the duration of exposure.
Pkg. Group: Not regulated
Ingested: Low toxicity. Large doses may irritate the gastro-
intestinal tract, causing diarrhea.
REACTIVITY DATA
Effects of Chronic Exposure to Product:
Chemical Stability: Normally stable
Incompatibility with other substances: Efflorescent in Chronic skin exposure may cause irritation.
warm, dry air. Slightly deliquescent in moist air. Strong oxi- Carcinogenicity: No human or animal information avail-
dizers cause vigorous exothermic reactions. Reaction with able. Not expected to be carcinogenic.
acids releases SO2. Reacts violently with sodium nitrite after
Teratogenicity: No information available
losing water at 100 掳C. Strong exothermic reaction between
Reproductive Effects: No information available
hydrate and water reactive materials (e.g. Sodium). Reacts
with acids, iodine, lead, mercury, silver salts, metal nitrates. Mutagenicity: No information available
Reactivity: Avoid excessive heat, ignition sources, all Synergistic Products: None known
incompatilbe materials, generation of dust.
MSDS SODIUM THIOSULPHATE
CODE:8460-1
PREVENTIVE MEASURES REFERENCES USED
Engineering Controls: Local exhaust ventilation recom- CCINFO disc: MSDS鈥檚, February 2007
mended. Budavari: The Merck Index, 12th ed., 1997
Respiratory Protection: Dust mask or respirator with high Sax, Lewis: Hawley鈥檚 Condensed Chemical Dictionary, 11th
efficiency particulate filter. For high or unknown concentra-
ed., 1987
tions, as in fire or spill conditions, NIOSH/MSHA approved
Suppliers鈥? Material Safety Data Sheets
supplied-air respirator with auxiliary positive-pressure
self-contained breathing apparatus, or positive-pressure, full
ADDITIONAL INFORMATION
face-piece self-contained breathing apparatus.
Eye Protection: Chemical safety goggles Date Issued: February 20, 1990
Skin Protection: Impermeable gloves. Other protective Revision: February 2007
clothing, apron, sleeves sufficient to prevent contact.
MSDS: 8460-1
Other Personal Protective Equipment: Safety shower
Proposed WHMIS Designation: D2B (eye irritation)
and eyewash fountain in work area.
Leak and Spill Procedure: Ventilate area of spill. Cleanup
Prepared by: Caledon Laboratories Ltd. (905) 877-0101
personnel must be thoroughly trained in the handling of haz-
Caledon Laboratories Ltd. believes the information contained
ardous materials, and must wear protective equipment and
clothing sufficient to prevent inhalation of fumes or mists, herein is reliable and accurate. Caledon makes no warranty
and contact with skin, eyes or clothing. Mix with inert absor- with respect thereto and expressly disclaims all liability for reli-
bent, transfer to container using a method that does not ance thereon. Such information is solely for your consider-
generate dust, and arrange removal by disposal company. ation, investigation, and verification.
Prevent from entering sewers or waterways. Wash area of
spillage thoroughly with copious amounts of water. Contam-
inated absorbent may present the same hazards as the
chemcial; treat with the same care.
Waste Disposal: Follow all federal, provincial and local
regulations for disposal.
Handling Procedures and Equipment: EYE IRRITANT.
Workers using this chemical must be properly trained in its
hazards and its safe use, and must wear appropriate protec-
tive equipment and clothing. Keep work areas free of
incompatible materials. Use the smallest amounts possible
for the purpose, in designated areas with adequate ventila-
tion. Avoid generating dusts. Avoid all contact and
inhalation. Keep containers closed when not in use.
Storage Requirements: Store in suitable, labelled contain-
ers, in a cool, dry, well ventilated area, out of direct sunlight
and away from oxidizers and other incompatible materials.
Keep containers tightly closed. Inspect frequently for dam-
age or signs of leaking.
FIRST AID MEASURES
Specific Measures:
Eyes: Flush eyes with plenty of gently running water for at
least fifteen (15) minutes, holding eyelids open while flush-
ing. Take care not to flush contaminated water into
unaffected eye. Get medical attention.
Skin: Remove contaminated clothing, including watches,
rings, belts, and shoes. Brush off excess material. Wash
skin with plenty of running water for five to ten (5-10) min-
utes, or until no trace of chemical remains. If irritation
develops get medical attention.
Inhalation: Remove patient to fresh air. Give oxygen and
get medical attention for breathing difficulty.
Ingestion: If vicitm is alert and NOT convulsing rinse
mouth thoroughly with water. Do not induce vomiting. Have
victim drink 2 to 4 glasses of water to dilute. If victim feels
unwell, or if a large amount has been ingested, get medical
attention.
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