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high purity thiourea dioxide, thiourea, formamidine sulphinic acid, tdo, fas, tdo, aimsa, aminoimino

price: 2.00元/Metric Ton
minimum: 1 Metric Ton
Total supply: 999999 Metric Ton
Delivery term: The date of payment from buyers Deliver within days
seat: Asia-Pacific China
Validity to: Long-term effective
Last update: 2016-09-05 13:10
Browse the number: 29
Company Profile
Product details

Product Details


  • thiourea dioxide
  • fomamidine sulphinic acid
  • tdo

Quick Details

  • ProName: high purity thiourea dioxide, thiourea...
  • CasNo: 1758-73-2
  • Molecular Formula: CH4N2O2S
  • Appearance: white crystal powder
  • Application: It is a new-type, environmentally frie...
  • DeliveryTime: prompt delivey
  • PackAge: 25kg bags, 50kg drums, 80kg fibc, 500k...
  • Port: Qingdao
  • ProductionCapacity: 7000 Metric Ton/Year
  • Purity: 99.9%
  • Storage: Store in a cool, dry, well ventilated ...
  • Transportation: OCEAN TRANSPORT
  • LimitNum: 1 Metric Ton
  • Heavy metal: Fe<>
  • Grade: Industrial Grade
  • UN NO.: 3341
  • CLASS: 4.2
  • PH: 4


Shandong Changyi Haosen Biotechnology Co., Ltd. is located in the northwest of beautiful Jiaodong Peninsula, the Chinese Salts Town - Changyi. It is in the coast of Bohai Sea, Laizhou Bay. With Yantai, Qingdao in the east, westward it is adjacent to Weifang City. Changyi is in "Qingdao one hour economic circle" and "Weifang half-hour economic circle". Not only the environment is beautiful but also the transportation is very convenient!

Changyi Haosen Biotechnology Co., Ltd. is a professional late-model manufacturer of thiourea dioxide / pulp bleaching agent FAS. Our company has advanced technical power, advanced equipment, as well as complete test instruments, so the products are stable and reliable in quality. We have our own import and export operation rights. We have the production capability of thiourea dioxide/ pulp bleaching agent FAS to more than 7,000 tons a year. The quality of all the TDO produced by our company implements the People's Republic of China chemical industry standards HG / T3258-2010.

By using new technological process, our thiourea dioxide crystalline granularity is more symmetrical and not easy to agglomerate. Our products also have good fluidity, great solubility and strong reducibility. As our products' external dryness is completely in comformity with the inside dryness, they are not easy to undergo spontaneous combustion, so the storage period has been greatly extended, which perfectly satisfies customers' needs. Our products are popular in the USA, Japan, Korea, Europe and other dozens of countries and regions. They are widely used in textile printing and dyeing, papermaking, the synthesis of organic compounds,etc. and have won a good reputation!

Haosen Biotechnology Co., Ltd. always insists to honor the honesty and keep our promise! We warmly welcome your visit and cooperation!


I. Description of the product

TDO ( Thiourea Dioxide ) is also named as FAS. Its appearance is white crystal powder. Thiourea Dioxide is a stable compound with no strong reducing and oxidizing ability, and its dissolvability is 26.7g/l(20℃),while its PH is 5.0 in saturated solution. TDO appears terrific stable even in 20℃-30℃ 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 substitute 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. 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 FAS

Byname Aminoiminomethane Sulfinic Acid

Appearance & Odor White Crystal, odorless

Molecular Formula (NH2)2CSO2

Molecular Weight 108.12

Melting Point 126℃

PH 4 (1% Solution)

CAS NO. 1728-73-2 or 4189-44-0

Dangerous Goods Class 4.2

Specific Gravity 1.68


Thiourea Dioxide(%) ≥99%

Thiourea(%) ≤0.2%

Moisture(%) ≤0.05%

Iron(Fe)(%) ≤10PPM

Sulphate(%) ≤0.17%


25kgs kraft paper compound plastic bags

25kgs woven plastic bags(with two inner layers)

50kgs fiber drums

80kgs, 500kgs, 1000kgs container bags

According to the buyer’s request

IV. Storage Points for Attention

Store in a cool ( below 30℃), 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 unlabelled 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.

V. Usage Points for Attention

Avoid contact with eyes, skin and clothing. Use with adequate ventilation. Do not swallow. Avoid breathing vapors, mists, or dust. Do not eat, drink, or smoke in work area. Prevent contact with combustible or organic materials. Label containers and keep them tightly closed when not in use. Wash thoroughly after handling.

VI. First-aid Measures

* Inhalation—Remove affected person to fresh air. Do not use mouth-to-mouth resuscitation. Seek medical attention if effects persist.

* Eye contact—Flush eyes with running water for at least 15 minutes with eyelids held open.Seek specialist’s advice.

* Skin contact—Wash affected skin with soap and mild detergent and large amounts of water.

* Ingestion—Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen.

* Do not use mouth-to-mouth resuscitation. Seek medical service immediately.

VII. Shipping Information

* Proper Shipping Name: Thiourea Dioxide

* UN Number: UN3341

* Hazard Class: 4.2

* Labels: 4.2( Flammable Solid )

* Packing Group: III

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