Thiourea dioxide
CAS 1758-73-2
EC 217-157-8
Formula CH4N2O2S
MW 108.12 g/mol
Oxidizers & Peroxides Textile, Leather & PaperWater TreatmentPulp & Paper Bleaching & WhiteningPreservation & Biocide
Description
Thiourea dioxide (CAS 1758-73-2, EC 217-157-8, formula CH4N2O2S) is an inorganic reducing and oxidising agent also known as formamidine sulfinate or amidinosulfinic acid, with the abbreviation TDO used in industrial contexts. It carries no assigned E-code and is not classified as a food additive.
In textile and pulp processing, thiourea dioxide bleaches cellulosic fibres and paper pulp by releasing sulfinic acid under alkaline conditions, which reduces chromophoric groups responsible for yellowing. In water treatment and leather processing, it acts as a reductive bleach and biocide, breaking down residual dye compounds and controlling microbial load in process water.
Thiourea dioxide is supplied as a white crystalline powder in technical and industrial grades, compliant with REACH registration requirements for the European market. Standard packaging includes 25 kg bags, with bulk formats available on request. Buyers should confirm grade specifications against internal formulation or process requirements prior to ordering.
In textile and pulp processing, thiourea dioxide bleaches cellulosic fibres and paper pulp by releasing sulfinic acid under alkaline conditions, which reduces chromophoric groups responsible for yellowing. In water treatment and leather processing, it acts as a reductive bleach and biocide, breaking down residual dye compounds and controlling microbial load in process water.
Thiourea dioxide is supplied as a white crystalline powder in technical and industrial grades, compliant with REACH registration requirements for the European market. Standard packaging includes 25 kg bags, with bulk formats available on request. Buyers should confirm grade specifications against internal formulation or process requirements prior to ordering.
Physical Properties
| Melting Point | 142-143 °C (decomp) |
| Boiling Point | 355.3±25.0 °C(Predicted) |
| Density | 1.68 |
| Appearance | white crystalline powder |
| Color | White |
| Form | Crystalline Powder |
| Water Solubility | 30 g/L (20 ºC) |
| Vapor Pressure | 0Pa at 25℃ |
| Refractive Index | 1.6550 (estimate) |
| pH | 4 (10g/l, H2O, 20℃) |
| Log P | -3.37 at 25℃ |
Safety & Handling (Learn More)
Danger GHS02 GHS05 GHS07 GHS08 GHS06
H
H251H252H302H315H318H319H330H332H335H336H361H370H371H373
P
P203P235P260P261P264P270P271P280P284P316P317P318P319P320P321P330P405P407P410P413P420P501P264+P265P301+P317P302+P352P304+P340P308+P316P332+P317P337+P317P362+P364P403+P233P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29309070 |
| UN Number | 3341 |
| ADR Class | 4.2 |
| Packing Group | II |
| Storage Class | 4.2 - Pyrophoric and self-heating hazardous materials |
| WGK (Germany) | 1 |
Other Names
amino(imino)methanesulfinic acidThiourea S,S-dioxideFormamidine sulfinateTDOFASTECHManofastDegussa FLorinol R
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Raw Materials
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