Safety and Hazards
Information on safety and hazards for this compound, including safety/hazards properties, reactivity, incompatibilities, management techniques, first aid treatments, and more. For toxicity and related information, please see the Toxicity section.
Hazards Identification
This section identifies the hazards of the chemical presented on the safety data sheet (SDS) and the appropriate warning information associated with those hazards. The information in this section includes, but are not limited to, the hazard classification of the chemical, signal word, pictograms, hazard statements and precautionary statements.
GHS Classification
GHS (Globally Harmonized System of Classification and Labelling of Chemicals) is a United Nations system to identify hazardous chemicals and to inform users about these hazards. GHS has been adopted by many countries around the world and is now also used as the basis for international and national transport regulations for dangerous goods. The GHS hazard statements, class categories, pictograms, signal words, and the precautionary statements can be found on the PubChem GHS page.
Not Classified
Reported as not meeting GHS hazard criteria by 2637 of 2963 companies
Aggregated GHS information provided per 2963 reports by companies from 8 notifications to the ECHA C&L Inventory.
Reported as not meeting GHS hazard criteria per 2637 of 2963 reports by companies.
There are 6 notifications provided by 326 of 2963 reports by companies with hazard statement code(s).
Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.ECHA C&L website.
Hazard Classes and Categories
The Hazard Classes and Categories are aligned with GHS (Globally Harmonized System of Classification and Labelling of Chemicals) hazard statement codes. The percentage data in the parenthesis from ECHA indicates that the hazard classes and categories information are consolidated from multiple companies. Also, see the detailed explanation from the above GHS classification section.
Not Classified
EPA Safer Chemical
EPA labels products so that consumers can easily choose ones that are safer for people and the environment. When consumers see the Safer Choice label on a product, they can be confident that the ingredients have been through a rigorous EPA review. The label means that EPA scientists have evaluated every ingredient in the product to ensure it meets Safer Choice's stringent criteria. When people use Safer Choice products, they are protecting their families and the environment by making safer chemical choices.
Chemical: Sodium thiosulfate
Green half-circle - The chemical is expected to be of low concern based on experimental and modeled data. Additional data would strengthen EPA's confidence in the chemical's safer status.
Fire Hazards
Fire hazard means any situation, process, material or condition which may cause a fire or explosion or provide a ready fuel supply to increase the spread or intensity of the fire or explosion and which poses a threat to life or property. This section provides information on fire hazards involving this chemical.
Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. Risk of explosion on contact with oxidizing agents.
Hazards Summary
This section provides an overview of the key hazards information of this compound.
Potential combustible dust hazard; Decomposes slowly in water with potential generation of toxic and flammable hydrogen sulfide and corrosive hydrogen sulfite and sulfuric acid; Very soluble in water; Extremely low vapor pressure; May violently decomposes at 223 deg C; [CHEMINFO] ADI = 0-0.7 mg/kg; [JECFA] May be used in food up to 0.1%; [Hawley] See Potassium thiosulfate.
Safety and Hazard Properties
This section lists the chemical's safety and hazard characteristics, such as the explosive/flammable limits, critical temperature and pressure, exposure limits, etc.
Explosive Limits and Potential
This section shows lower and upper explosive limits of this chemical and other information on its explosive potential. Explosive limits specify the concentration range of a material in air which will burn or explode in the presence of an ignition source. There are two types of explosive limits: lower explosive limit (LEL) and upper explosive limit (UEL). The explosive limits are usually given as the percent by volume of the material in the air (e.g., 5%).
DRY TRITURATION WITH OXIDIZING AGENTS SUCH AS POTASSIUM CHLORATE, POTASSIUM PERMANGANATE, OR NITRATE MAY CAUSE EXPLOSION.
WHEN SODIUM NITRITE & THIOSULFATE MIXT WAS HEATED TO EVAPORATE TO DRYNESS, VIOLENT EXPLOSION OCCURRED.
First Aid Measures
This section describes the initial care that should be given to an individual who has been exposed to the chemical. The information in this section includes the description of the symptoms or effects of exposure to the chemical, necessary first-aid instructions by relevant routes of exposure (inhalation, skin and eye contact, and ingestion), and recommendations for immediate medical care and special treatment needed, when necessary.
Fresh air, rest.
Rinse and then wash skin with water and soap.
Rinse with plenty of water for several minutes (remove contact lenses if easily possible).
Rinse mouth.
Fire Fighting
This section provides fire fighting information, including fire fighting procedures and hazards.
In case of fire in the surroundings, use appropriate extinguishing media.
Accidental Release Measures
This section provides recommendations on the appropriate response to spills, leaks, or releases, including containment and cleanup practices to prevent or minimize exposure to people, properties, or the environment. It may also include recommendations distinguishing between responses for large and small spills where the spill volume has a significant impact on the hazard.
Spillage Disposal
Methods for containment and safety measures to protect workers dealing with a spillage of this chemical.
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers.
Handling and Storage
This section provides guidance on the safe handling practices and storage conditions for this chemical. The information in this section includes precautions for safe handling, such as recommendations for handling incompatible chemicals, minimizing the release of the chemical into the environment, and providing advice on general hygiene practices (e.g., eating, drinking, and smoking in work areas is prohibited). In addition, this section provides recommendations on the conditions for safe storage (including any incompatibilities) as well as advice on specific storage requirements (e.g., ventilation requirements).
Safe Storage
Measures to take for safe storage of this chemical.
Separated from strong oxidants.
Exposure Control and Personal Protection
This section provides information on the exposure limits, engineering controls, and personal protective measures that can be used to minimize worker exposure. The information in this section includes OSHA Permissible Exposure Limits (PELs), American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values (TLVs), and any other exposure limit used or recommended by the chemical manufacturer, importer, or employer preparing the safety data sheet, where available. In addition, this section contains information on appropriate engineering controls (e.g., use local exhaust ventilation, or use only in an enclosed system) as well as recommendations for personal protective measures to prevent illness or injury from exposure to chemicals, such as personal protective equipment (PPE) (e.g., appropriate types of eye, face, skin or respiratory protection needed based on hazards and potential exposure).
Inhalation Risk
Risk of exposure to this chemical through inhalation. Note that the terms "risk" and "hazard" have different meanings. A hazard is something that has the potential to cause harm, while risk is the likelihood of harm taking place, based on exposure to that hazard.
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed.
Fire Prevention
Precautionary measures to prevent fires from this chemical.
NO contact with oxidizing agents.
Inhalation Prevention
Precautionary measures to avoid inhalation of this chemical.
Avoid inhalation of dust.
Eye Prevention
Precautionary measures to avoid eye exposure to this chemical.
Wear safety goggles.
Ingestion Prevention
Precautionary measures to avoid ingestion of this chemical.
Do not eat, drink, or smoke during work.
Regulatory Information
This section lists the regulations related to the safety, health, and environment of the chemical and its associated products. The regulatory information, which may encompass national and/or regional regulations pertaining to the chemical or mixtures, is presented solely for informational purposes. For additional details, please consult the links to the information sources provided under each data entry.
Chemical: Thiosulfuric acid (H2S2O3), disodium salt
Status: Active Update: 24-04-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/14321
Sodium thiosulphate: Does not have an individual approval but may be used under an appropriate group standard
FDA Requirements
FDA requirements regarding this chemical and products containing it. FDA Requirements means any requirements of the Federal Food, Drug and Cosmetic Act (FDCA), as amended, and any rules or regulations promulgated thereunder which are or may be applicable to the manufacture, sale, labeling or distribution of the products regulated by FDA (e.g., drugs, biologics, dietary supplements, foods, cosmetics, tobacco products, etc.).
121.101; LIMITATIONS: GRAS, SEQUESTRANT IN SALT UP TO 0.1%
Other Safety Information
Miscellaneous safety information for this chemical that is not shown in other sections, such as history, incidents, special reports, and so on.
IMAP assessments - Thiosulfuric acid (H2S2O3), disodium salt: Environment tier I assessment
IMAP assessments - Thiosulfuric acid (H2S2O3), disodium salt: Human health tier I assessment