Thiourea Dioxide/TDO

Thiourea Dioxide, TDO, TUD Purity: 99.0% min Cas no.: 1758-73-2 Reducing agent used in textile and paper making industry

I. Description of the product

Thiourea Dioxide (TDO or TUD) is also named as Formamidine Sulfinic Acid. Its

appearance is white crystal powder. Thiourea Dioxide is a stable compound with no strongreducing and oxidizing ability, and its dissolvability is 26.7g/l (20 degrees centigrade), while its PH is 5.0 in saturated solution. TDO appears terrific stable even in 20 -30 degrees centigrade solution, but when it is under heat or catalysesing by alkali, it decomposes gradually to produce sulfoxylic acid through formamidine sulfinic acid to exhibit a reducing action

II. Applications of the Product

TDO is a new kind of reducing agent that used as exchange of sodium hydrosulfite. It is

widely used in textile and paper making industry. This product is also used in leather

processing industry, paper, pulp and board industry, photographic industry, bleaching and

reducing agents. This product is also a component of decolorisation agents. In

macromolecule material industry, it is used as catalysis agent and stabilizer of resinic

producing, and it is also used in organic synthesization of sensitizing material, and

medicine, medical, spicery materials in fine chemicals, and also can be applied in the

recycling and separating of heavy metals.

III. Quality Terms

Physical & Chemical Features

Name                             Thiourea Dioxide

Byname                           Formamidine Sulfinic Acid

Appearance & Odor                 White Crystal, odorless

Molecular Formula                 (NH2)2CSO2

Molecular Weight                   108.12

Melting Point                       126 Degrees centigrage

CAS NO.                          1758-73-2 or 4189-44-0

Dangerous Goods Class             4.2

Specific Gravity 1.68

Specifications

Thiourea dioxide(%)              ≥99%

Thiourea(%)                     ≤0.1%

Moisture(%)                     ≤0.05%

Iron (Fe) (%)                    ≤10PPM

Sulphate(%)                     ≤0.17%

Packing

25kgs kraft paper compound plastic bags25kgs plastic bags (with two inner layers)50kgs fiber drums80kgs, 200kgs, 500kgs, 1000kgs containing bags

according to the buyer's request

VI. Storage Points for Attention

Store in a cool (below 30 degrees centigrade ), dry, well ventilated area away from all source of ignition and out of direct sunlight. Keep away from incompatible materials. Keep containers tightly closed. Do not store in unlabeled or mislabeled containers. Protect from moisture. Do not store near combustible materials. Keep containers well sealed, seal only with original vent cap. Ensure pressure relief and adequate ventilation. Store separately from organics and reducing materials. Avoid contamination which may lead to decomposition.

 

Thiourea Dioxide/TDO