I. Description of the product

Thiourea Dioxide (TDO or TUD) isalso named as Formamidine Sulfinic Acid,Aminoinomethane sulfinicacid. Its appearance is white crystal powder. Thiourea Dioxide is astable compound with no strongreducing and oxidizing ability, andits dissolvability is 26.7g/l (20 degrees centigrade), while its PHis 5.0 in saturated solution. TDO appears terrific stable even in20 -30 degrees centigrade solution, but when it is under heat orcatalysesing by alkali, it decomposes gradually to producesulfoxylic acid through formamidine sulfinic acid to exhibit areducing action

II. Applications of theProduct

TDO is a new kind of reducing/bleaching agent thatused 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 boardindustry, photographic industry, bleaching and

reducing agents. This product is also a componentof decolorisation agents. In

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

producing, and it is also used in organicsynthesization of sensitizing material, and

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

recycling and separating of heavy metals.

III. Quality Terms

Physical & ChemicalFeatures

Name                            ThioureaDioxide

Byname                          FormamidineSulfinic Acid

Appearance & Odor                WhiteCrystal, odorless

Molecular Formula                (NH2)2CSO2

Molecular Weight                  108.12

Melting Point                      126Degrees centigrage

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

Dangerous Goods Class            4.2

Specific Gravity 1.68

Specifications

Thioureadioxide(%)             ≥99%

Thiourea(%)                    ≤0.1%

Moisture(%)                    ≤0.05%

Iron (Fe) (%)                   ≤10PPM

Sulphate(%)                    ≤0.17%

Packing

25kgs kraft paper compound plastic bags
25kgs plastic bags (with two inner layers)
50kgs fiber drums
80kgs, 200kgs, 500kgs, 1000kgs containing bags

according to the buyer''s request

VI. Storage Points forAttention

Store in a cool (below 30 degrees centigrade ),dry, well ventilated area away from all source of ignition and outof direct sunlight. Keep away from incompatible materials. Keepcontainers tightly closed. Do not store in unlabeled or mislabeledcontainers. Protect from moisture. Do not store near combustiblematerials. Keep containers well sealed, seal only with originalvent cap. Ensure pressure relief and adequate ventilation. Storeseparately from organics and reducing materials. Avoidcontamination which may lead to decomposition.

1758-73-2,Thiourea Dioxide