Backed by over 40 years of manufacturing experience dating back to 1983, we have mastered the production of Thiourea Dioxide. Our product outperforms competitors in both performance and safety. Dedicated to innovation and quality, we stand as an industry leader, ready to meet the dynamic needs of our global customers.
Chemical Name： Thiourea Dioxide
Synonyms： Aminoiminomethanesulphinic Acid, Methanesulfinic acid, aminomino
Chemical Formula：CH4N2O2S
CAS #: 1758-73-2
Molecular Weight：108.12
Structure Formula： 
Technical Index
Appearance： free-flowing white crystal powder
Active ingredients： 99% Min
Thiourea ： 0.1% Max
Moisture： 0.05% Max
Ash： 0.17% Max
Iron(II) ion： 0.001% Max
Properties：
Thiourea Dioxide is an odorless white powder known for its excellent chemical stability. It is safe to handle under ambient conditions. It has a solubility of 26.7 g/L in water at 20°C, with a saturated solution pH of 5.0. While it remains very stable in aqueous solutions at 20-30°C, it gradually decomposes to form sulfinic acid under thermal and alkaline conditions, exerting its reducing power.
Compared with traditional sodium dithionite (hydrosulfite), thiourea dioxide features outstanding thermal stability, low odor, a lower risk of decomposition, and reduced harmful emissions during storage and operation. It serves as an ideal eco-friendly replacement for sodium dithionite (hydrosulfite) across multiple key sectors.
Core Application Fields：
1. Textile Printing & Dyeing
Perfect for vat dyeing, sulfur dyeing, wool & silk bleaching, reduction cleaning for disperse dyes, color stripping and vat cleaning. It delivers uniform whiteness without damaging fiber texture, greatly improving color fastness of finished fabrics.
2. Paper & Pulp Industry
Applied in mechanical pulp bleaching and waste paper deinking. It efficiently removes chromophores while preserving pulp viscosity, boosting paper brightness and tensile strength with mild fiber damage.
3. Synthetic Fiber Manufacturing
Functions as a stabilizer and reducing auxiliary to prevent fiber yellowing, optimize polymerization processes and enhance the quality of polyester, polyamide and other synthetic fibers.
4. Kaolin Processing
Used for reductive bleaching of kaolin clay to eliminate iron impurities, raising whiteness of kaolin for high-end paper coating, ceramic and filler production.
Storage and Handling：
Keep thiourea dioxide in a cool, dry and ventilated place. Avoid damp, direct sunlight and rain. Keep away from heat, sparks, flames, alkalis or oxidizing agents.
Packing：
25 kg / 80 kg net in kraft paper bags or plastic woven bags
50 kg fiber drum
500 kg jumbo bag