Material Safety Data Sheet
Sodium Thiosulfate
1. PRODUCT AND COMPANY IDENTIFICATION
Sodium Thiosulfate, Anhydrous and Crystal
PRODUCT NAME:
Sodium hyposulfite; "hypo"; Sodium thiosulfate pentahydrate (crystal); Prismatic
OTHER/GENERIC NAMES:
Rice
Photo processing, water treatment, waste treatment, paper manufacture, other industrial
PRODUCT USE:
processes.
Esseco General Chemical
MANUFACTURER:
90 East Halsey Road
Parsippany, NJ 07054
USA
973-515-1840 800-631-8050 or
FOR MORE INFORMATION CALL: IN CASE OF EMERGENCY CALL:
973-515-0900
(24 Hours/Day, 7 Days/Week)
(Outside of USA)
(Monday-Friday, 9:00am-4:30pm)
2. COMPOSITION/INFORMATION ON INGREDIENTS
INGREDIENT NAME CAS NUMBER WEIGHT %
Sodium thiosulfate 7772-98-7 >97.5 (anhydrous)
>63 (crystal)
Trace impurities and additional material names not listed above may appear in Section 15 of this MSDS. These
materials may be listed for local "Right-To-Know" compliance and for other reasons.
This product is considered hazardous under the OSHA Hazard
OSHA Hazard Communication Standard:
Communication Standard.
3. HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW: Odorless, clear to white crystals or granules which may irritate
the skin and respiratory tract. May cause irritation and/or burns to the eyes. Reacts with
acids to form toxic and irritating sulfur dioxide gas and/or hydrogen sulfide gas. Not
flammable.
POTENTIAL HEALTH HAZARDS
Dust, solutions or mist may cause skin irritation from repeated or prolonged contact.
SKIN:
Dust, solutions or mist may irritate or burn the eyes and cause temporary conjuntivitis.
EYES:
Inhalation of product dust or mist may irritate the respiratory tract. Contact with acids releases
INHALATION:
sulfur dioxide and/or hydrogen sulfide gas which may be harmful or deadly if inhaled.
MSDS Number: EGC-0009 Page 1 of 6
Current Issue Date: April, 2003
MATERIAL SAFETY DATA SHEET
Sodium Thiosulfate
Ingestion may cause irritation of the gastrointestinal tract and purging, if a large quantity is
INGESTION:
ingested. Relatively low in acute toxicity.
DELAYED EFFECTS: None known.
Ingredients found on one of the three OSHA designated carcinogen lists are listed below.
INGREDIENT NAME NTP STATUS IARC STATUS OSHA LIST
No ingredients listed in this section.
4. FIRST AID MEASURES
Wash skin with plenty of soap and water. Remove contaminated clothing and wash before reuse. Get
SKIN:
medical attention if irritation persists.
Flush eyes immediately with water for at least 15 minutes. Get medical attention if irritation persists.
EYES:
Promptly remove to fresh air. If breathing is difficult, give oxygen, provided a qualified operator is
INHALATION:
available. If symptoms persist, get medical attention.
If conscious, immediately give 2 to 4 glasses of water and induce vomiting by touching finger to
INGESTION:
back of throat. If irritation persists, get medical attention.
Treat symptomatically.
ADVICE TO PHYSICIAN:
5. FIRE FIGHTING MEASURES
FLAMMABLE PROPERTIES
Not flammable
FLASH POINT:
Not applicable
FLASH POINT METHOD:
Not applicable
AUTOIGNITION TEMPERATURE:
Not applicable
UPPER FLAME LIMIT (volume % in air):
Not applicable
LOWER FLAME LIMIT (volume % in air):
Not applicable
FLAME PROPAGATION RATE (solids):
Not applicable
OSHA FLAMMABILITY CLASS:
EXTINGUISHING MEDIA:
Material is not flammable. Use extinguishing media appropriate for material in surrounding fire.
UNUSUAL FIRE AND EXPLOSION HAZARDS:
None.
SPECIAL FIRE FIGHTING PRECAUTIONS/INSTRUCTIONS:
Wear NIOSH-approved self-contained breathing apparatus to protect against any release of toxic and/or irritating
fumes. Skin and eye protection should also be provided. Use water-spray to keep fire-exposed containers cool,
and to knock down fumes.
MSDS Number: EGC-0009 Page 2 of 6
Current Issue Date: April, 2003
MATERIAL SAFETY DATA SHEET
Sodium Thiosulfate
6. ACCIDENTAL RELEASE MEASURES
IN CASE OF SPILL OR OTHER RELEASE: (See section 8 for recommended personal protective equipment.)
Promptly shovel or sweep up material with minimum dusting and shovel into an empty container with a cover.
Cautiously spray residue with plenty of water.
Spills and releases may have to be reported to Federal and/or local authorities. See Section 15 regarding
reporting requirements.
7. HANDLING AND STORAGE
NORMAL HANDLING: (See section 8 for recommended personal protective equipment.)
Avoid contact with skin, eyes and clothing. Do not breathe dust or mist. Use with adequate ventilation. Wash
thoroughly after handling.
If dissolving and mixing solutions: with anhydrous material, the reaction is exothermic and the solution will retain
heat; with the hydrate (crystal) material, the reaction is endothermic and the solution will cool.
STORAGE RECOMMENDATIONS:
Store in a cool, dry, well-ventilated area away from acids and oxidizing agents. Keep container closed when not in
use and protect from physical damage.
8. EXPOSURE CONTROLS/PERSONAL PROTECTION
ENGINEERING CONTROLS:
Provide local exhaust if dusty or misty conditions exist or if there is a release of sulfur dioxide and/or hydrogen
sulfide gas. Keep incompatible materials out of hoods, ducts, etc.
PERSONAL PROTECTIVE EQUIPMENT
For handling dry material, wear cotton gloves and full work clothing, including long-
SKIN PROTECTION:
sleeved shirt and trousers. When handling solutions, wear impervious gloves and
an apron. If contact with the solution is repeated and/or prolonged, wear full
impervious clothing.
Wear a hard hat (or other head covering) and chemical safety glasses/goggles. Do
EYE PROTECTION:
not wear contact lenses.
Where required, use a NIOSH-approved respirator for dust, mist, sulfur dioxide
RESPIRATORY
and/or hydrogen sulfide gas, as conditions indicate. If sulfur dioxide and/or
PROTECTION:
hydrogen sulfide gas should be released, use a NIOSH-approved self-contained
breathing apparatus or supplied-air respirator.
Eyewash and safety shower is recommended.
ADDITIONAL
RECOMMENDATIONS:
MSDS Number: EGC-0009 Page 3 of 6
Current Issue Date: April, 2003
MATERIAL SAFETY DATA SHEET
Sodium Thiosulfate
EXPOSURE GUIDELINES
INGREDIENT NAME ACGIH TLV OSHA PEL OTHER LIMIT
No ingredients listed in this section.
1
= Limit established by General Chemical Corporation.
2
= Workplace Environmental Exposure Level (AIHA).
3
= Biological Exposure Index (ACGIH).
OTHER EXPOSURE LIMITS FOR POTENTIAL DECOMPOSITION PRODUCTS:
Sulfur dioxide: OSHA TWA = 5 ppm; ACGIH TLV = 2 ppm; ACGIH STEL = 5 ppm
Hydrogen sulfide: OSHA Ceiling = 20 ppm; ACGIH TLV = 10 ppm; ACGIH STEL = 15 ppm
9. PHYSICAL AND CHEMICAL PROPERTIES
Clear to White granules or crystals.
APPEARANCE:
Solid.
PHYSICAL STATE:
158.11 (anhydrous)
MOLECULAR WEIGHT:
248.18 (crystal)
Na2S2O3 (anhydrous)
CHEMICAL FORMULA:
Na2S2O3 路 5H2O (crystal)
Odorless.
ODOR:
1.667 (anhydrous)
SPECIFIC GRAVITY (water = 1.0):
1.685 (crystal)
33 @ 0掳C (anhydrous)
SOLUBILITY IN WATER (weight %):
52 @ 0掳C (crystal)
~8.6 (7.5% solution; anhydrous)
pH:
Not applicable.
BOILING POINT:
48掳C (crystal)
MELTING POINT:
Not applicable.
VAPOR PRESSURE:
Not applicable.
VAPOR DENSITY (air = 1.0):
Not applicable.
EVAPORATION RATE: COMPARED TO: Not applicable.
Not applicable.
% VOLATILES:
Not flammable.
FLASH POINT:
(Flash point method and additional flammability data are found in Section 5.)
10. STABILITY AND REACTIVITY
NORMALLY STABLE? (CONDITIONS TO AVOID):
Normally stable.
INCOMPATIBILITIES:
Strong oxidizers: causes vigorous exothermic reactions.
Acids: releases sulfur dioxide and/or hydrogen sulfide gas.
HAZARDOUS DECOMPOSITION PRODUCTS:
Sulfur dioxide gas, hydrogen sulfide gas and sodium sulfide residue.
HAZARDOUS POLYMERIZATION:
Will not occur.
MSDS Number: EGC-0009 Page 4 of 6
Current Issue Date: April, 2003
MATERIAL SAFETY DATA SHEET
Sodium Thiosulfate
11. TOXICOLOGICAL INFORMATION
IMMEDIATE (ACUTE) EFFECTS:
Data not available.
DELAYED (SUBCHRONIC AND CHRONIC) EFFECTS:
Data not available.
OTHER DATA:
None.
12. ECOLOGICAL INFORMATION
Data not available.
13. DISPOSAL CONSIDERATIONS
RCRA
Is the unused product a RCRA hazardous If yes, the RCRA ID number is: Not applicable.
waste if discarded? No.
OTHER DISPOSAL CONSIDERATIONS:
Dispose of in accordance with applicable Federal, State and Local regulations.
The information offered in section 13 is for the product as shipped. Use and/or alterations to the product such as
mixing with other materials may significantly change the characteristics of the material and alter the RCRA
classification and the proper disposal method.
14. TRANSPORT INFORMATION
Not regulated.
US DOT HAZARD CLASS:
Not applicable.
US DOT ID NUMBER:
Not applicable.
PROPER SHIPPING NAME:
For additional information on shipping regulations affecting this material, contact the information number found in
Section 1.
15. REGULATORY INFORMATION
TOXIC SUBSTANCES CONTROL ACT (TSCA)
All components are listed on TSCA Inventory of Chemical Substances.
TSCA INVENTORY STATUS:
OTHER TSCA ISSUES: None.
SARA TITLE III/CERCLA
"Reportable Quantities" (RQs) and/or "Threshold Planning Quantities" (TPQs) exist for the following ingredients.
INGREDIENT NAME SARA/CERCLA RQ (lb) SARA EHS TPQ (lb)
MSDS Number: EGC-0009 Page 5 of 6
Current Issue Date: April, 2003
MATERIAL SAFETY DATA SHEET
Sodium Thiosulfate
No ingredients listed in this section.
Spills or releases resulting in the loss of any ingredient at or above its RQ requires immediate notification
to the National Response Center [(800) 424-8802] and to your Local Emergency Planning Committee.
Immediate.
SECTION 311 HAZARD CLASS:
SARA 313 TOXIC CHEMICALS:
The following ingredients are SARA 313 "Toxic Chemicals" and may be subject to annual reporting requirements.
CAS numbers and weight percents are found in Section 2.
INGREDIENT NAME COMMENT
No ingredients listed in this section.
STATE RIGHT-TO-KNOW
In addition to the ingredients found in Section 2, the following are listed for state right-to-know purposes.
INGREDIENT NAME WEIGHT % COMMENT
No ingredients listed in this section.
ADDITIONAL REGULATORY INFORMATION:
None.
WHMIS CLASSIFICATION (CANADA):
D2B
FOREIGN CHEMICAL CONTROL INVENTORY STATUS:
Listed on Canadian DSL and EU EINECS.
16. OTHER INFORMATION
April, 2003
CURRENT ISSUE DATE:
February, 2002
PREVIOUS ISSUE DATE:
CHANGES TO MSDS FROM PREVIOUS ISSUE DATE ARE DUE TO THE FOLLOWING:
Change in company name.
This product is not for food or drug use.
OTHER INFORMATION:
MSDS Number: EGC-0009 Page 6 of 6
Current Issue Date: April, 2003
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