thiourea dioxide (TDO)|RONAS CHEMICALS IND.CO.,LTD.

THIOUREA DIOXIDE (TDO, TUD)
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Description of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Formula of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): CH4N2O2S
F.W. of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 108.11
CAS no. of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 4189-44-0/1758-73-2
DOT of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 4.2/III
NFPA no. of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): Nill
Class no.of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 4.2
UN no. of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 3341
HS code of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): 2930.90
Specific Gravity of thiourea dioxide (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD): Nill

Thiourea dioxide is also called formamidine-sulfinic acid or aminoiminomethanesulfinic acid and is often abbreviated as TDO or TUD. Thiourea dioxide is a loose white crystalline powdered stable compound, which dissolves in water and decomposes gradually to produce sulfoxylic acid through formamidine-sulfinic acid to exhibit a reducing action. This reaction is promoted by the application of heat or in the presence of an alkali, and a strong reducing action is thereby exhibited. But, this reaction is slow, and particularly in an acidic to weakly alkaline region.

Specification of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Items	Specification
Purity, %	99 MIN
Thiourea, %	0.1 MAX
Moisture,%	0.05 MAX
Iron (Fe), ppm	10 MAX
Sulphate, %	0.17 MAX
Appearance	White crystalline powder

Application of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Thiourea dioxide (TDO) is a strong reductant which re-arranges under alkaline conditions to form formamidine sulphinic acid. This product is used in leather processing industry, paper, pulp and board industry, photographic industry, textile processing industry, bleaching and reducing agents. This product is also a component of decolorisation agents.Thiourea dioxide (TDO) bleaching has recently come to be spotlighted as a substitute for NaClO bleaching in bleaching of waste wood-free or mechanical paper and as a substitute for Sodium Hydrosulfite bleaching in post-bleaching after hydrogen peroxide deinking/bleaching of waste newspaper, from the viewpoint of the problem of waste water pollution by organic chlorine compounds represented by dioxins, demand for energy conservation, decoloring effect on dye type coloring materials, etc.
Thiourea dioxide (TDO) bleaching has a considerable decoloring effect on dye type coloring materials, like Sodium Hydrosulfite bleaching, and Thiourea dioxide (TDO) has a property of reacting with oxygen in air slowly as compared with Sodium Hydrosulfite. Even when a presently used NaClO bleaching equipment is diverted as it is, a loss due to oxidative decomposition is relatively small and a bleach brightness equal to that attained by NaClO bleaching can be attained by choosing a suitable using amount of Thiourea dioxide (TDO).
Thiourea dioxide (TDO) undergoes relatively rarely oxidative decomposition by oxygen in air. Thiourea dioxide (TDO) bleaching is suitable for bleaching pulp having a high consistency by a usual equipment while achieving a saving in energy. Thiourea dioxide (TDO) has been very effective on a wide variety of pulp sources as a reductive bleaching aid in the pulp and paper industry. The application of Thiourea dioxide (TDO) is crucial to achieve optimal brightness gain in the deinking process.

Packing&Storage of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Packing of Thiourea dioxide (TDO): 25 kgs kraft paper bag or 50kgs in fiber drum
Storage of Thiourea dioxide (TDO):
Store in a cool (below 30 degree C ), 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.

MSDS of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Material Safety Data Sheets of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)
1. Chemical Product
Product Name: Thiourea Dioxide
Synonyms: Formamidine sulfinic acid, FAS, TDO

2. Composition/Information on Ingredients
Ingredients: Thiourea Dioxide
Chemical Formula: CH4N2O2S
CAS No.: 1758-73-2
Percentage: Min.99.0

3. Hazards Identification
Potential Health Effects
Inhalation¡¡¡¡.¡.
Eye contact¡¡¡¡...
Skin contact¡¡¡.¡.
Ingestion¡¡¡¡¡...

4. First-aid Measures
Inhalation¡¡¡¡¡..
Eye contact¡¡¡¡...
Skin contact¡¡¡¡..
Ingestion¡¡¡¡¡...
Irritating to the respiratory tract. Can produce delayed pulmonary edema.
May cause irritation to the eyes; May cause chemical conjunctivitis.
May cause skin irritation.
Irritation of the mouth and throat with nausea and vomiting.

Remove affected person to fresh air. Seek medical attention if effects persist.
Flush eyes with running water for at least 15 minutes with eyelids held open. Seek specialist advice.
Wash affected skin with soap and mild detergent and large amounts of water.
If the person is conscious and not convulsing, give 2-4 cupfuls of water to dilute the chemical and seek medical attention immediately. Do not inducing vomiting.

5. Fire Fighting Measure
Flash Point
Not applicable
Flammability
Not applicable
Ignition Temperature
Not applicable
Danger of Explosion
Non-explosive
Extinguishing Media
Water
Fire Hazards
Not combustible. If involved in a fire, can decompose generating sulphur dioxide, ammonia, and sulfinic acid. Incompatible with oxidizing agents, water and heavy metals. Material is shock sensitive and potentially explosive. Hazardous decomposition products include carbon dioxide and probably carbon monoxide. Oxides of nitrogen and sulphur may also be present. Hazardous polymerization will not occur.
Fire-Fighting Measures
Evacuate all non-essential personnel
Wear protective clothing and self-contained breathing apparatus
Remain upwind of fire to avoid hazardous vapors and decomposition products
Use water spray to cool fire-exposed containers

6. Accidental Release Measures
Spill Clean-up Procedures
Eliminate all sources of ignition. Evacuate unprotected personnel from equipment recommendations found in Section 8. Never exceed any occupational exposure limit.
Shovel or sweep material into plastic bags or vented containers for disposal. Do not return spilled or contaminated material to inventory.
Flush remaining area with water to remove trace residue and dispose of properly. Avoid direct discharge to sewers and surface waters. Notify authorities if entry occurs.
Do not touch or walk through spilled material. Keep away from combustibles (wood, paper, oils, etc.). Do not return any product to container because of the risk of contamination.

7. Handling and Storage
Storage
Store in a cool (below 30 degree C ), 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. Never return unused product to storage container.
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.
Handling
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.

8. Exposure Controls/Personal Protection
Engineering Controls
General room ventilation is required. Local exhaust ventilation, process enclosures or other engineers controls may be needed to maintain airborne levels below recommended exposure limits. Avoid creating dust or mist. Maintain adequate ventilation. Do not use in closed or confined spaces. Keep levels below exposure limits. To determine exposure levels, monitoring should be performed regularly.
Respiratory Protection
For many conditions, no respiratory protection may be needed; however, in dusty or unknown atmospheres or when exposures exceed limit values, wear a NIOSH approved respirator.
Eye/Face Protection
Wear chemical safety goggles and a full face shield while handling this product.
Skin Protection
Prevent contact with this product. Wear gloves and protective clothing depending on condition of use.
Other Protective Equipment
Eye-wash station
Safety shower
Impervious clothing
Rubber boots
General Hygiene Considerations
Wash with soap and water before meal times and at the end of each work shift. Good manufacturing practices require gross amounts of any chemical be removed from skin as soon as practical, especially before eating or smoking.

9. Physical and Chemical Properties
Appearance: White crystalline powder
Odor: None
Solubility: 30g/L @ 20degree C Decomposition Temperature: 123 degree C

10. Stability and Reactivity
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Conditions to Avoid
Water
Excessive heat
Strong alkalies
Strong oxidizing agents
Hazardous Decomposition Products
Ammonia, Sulfur dioxide

11. Toxicological Information
No specific data

12. Ecological Information
No specific data

13. Disposal Considerations
Waste Treatment
Dispose of in an approved waste facility operated by an authorized contractor in compliance with local regulations.
Package Treatment
The empty and clean containers are to be recycled or disposed of in conformity with local regulations.

14. Transport Information
Proper Shipping Name: Thiourea Dioxide
UN Number: UN3341
Hazard Class: 4.2
Labels: 4.2 (Flammable Solid)
Packing Group: III

15. Regulatory Information
SARA Section¡¡¡¡¡¡.¡¡... Yes
SARA (313) Chemicals¡¡¡¡¡. No
EPA TSCA Inventory¡¡¡¡¡¡. No
Canadian WHMIS Classification¡.. C, D2B
Canadian DSL¡¡¡¡¡¡¡¡... Appears
EINECS Inventory¡¡¡¡¡¡¡. Appears

16. Other Information
Disclaimer
The data in this Material Safety Data Sheet is believed to be correct. However, since conditions of use are outside our control it should not taken as a warranty of representation for which Shangyu Jiehua Chemical Co., Ltd. assumes legal responsibility. This information
is provided solely for your consideration, investigation, and verification.

THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD) raw mateiral

1) thiourea & hydrogen peroxide.

THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD) end goods

Reductant.

Substitute of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Nill

Importing & exporting rules of THIOUREA DIOXIDE (Formamidine-sulfinic acid, aminoiminomethanesulfinic acid, TDO, TUD)

Normal

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