Aminoiminomethansulfinsure

Thiourea dioxide appears as a white or light-yellow odorless crystalline powder. Mp:126 °C. Soluble in water (27 g / L at room temperature). Decomposes exothermically at temperatures above 126 °C with the emission of noxious gases (sulfur oxides, ammonia, carbon monoxide, nitrogen oxides and hydrogen sulfide) and carbon dioxide. Extended exposure to temperatures above 50 °C and moisture may cause visible decomposition. Irritating to skin and mucous membranes. Corrosive to eye tissue. Used in leather processing, the paper industry, photographic industry, and in textile processing as a bleaching agent.

Dry Powder

This chemical does not meet GHS hazard criteria for 2.4% (4 of 164) of reports.

Danger

H251 (59.8%): Self-heating; may catch fire [Danger Self-heating substances and mixtures]

P235, P260, P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, P407, P410, P413, P420, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 164 reports by companies from 25 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Danger

Chemical: Methanesulfinic acid, aminoimino-

Methanesulfinic acid, 1-amino-1-imino- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Methanesulfinic acid, 1-amino-1-imino- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 17-06-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/8595

Thiourea dioxide: HSNO Approval: HSR001431 Approved with controls

Excerpt from ERG Guide 135 [Substances - Spontaneously Combustible]:

· Flammable/combustible material.

Excerpt from ERG Guide 135 [Substances - Spontaneously Combustible]:

· Fire will produce irritating, corrosive and/or toxic gases.

Thiourea dioxide is a reducing agent and a derivative of sulfinic acid (a weak inorganic acid). Decolorizes and bleaches materials by chemical reduction. Stable under normal temperatures and pressures. May decompose on exposure to moist air or water. Incompatible with strong oxidizing agents, strong bases. Aqueous solutions are acidic and corrosive.

Thiourea dioxide

UN3341

Div 4.2 Spontaneously combustible material (49 eCFR § 173.124)

PG II: the degree of danger presented by the material is medium

Self-heat. 1 (59.8%)

Eye irritation - category 2A

Self-heating substances and mixtures - Category 1

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

Excerpt from ERG Guide 135 [Substances - Spontaneously Combustible]:

General First Aid:

Excerpt from ERG Guide 135 [Substances - Spontaneously Combustible]:

Immediate precautionary measure

Not Known or Reasonably Ascertainable

Methanesulfinic acid, 1-amino-1-imino-: ACTIVE