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Thiourea structure
Chemical Name:
THU;THIO;250g;tsizp34;Thiurea;(NH2)2CS;Sulourea;thio-ure;thiouree;Tsizp 34
Molecular Formula:
Formula Weight:
MOL File:

Thiourea Properties

Melting point:
171 °C
Boiling point:
263.89°C (estimate)
refractive index 
1.5300 (estimate)
storage temp. 
Store at RT.
water: soluble137g/L at 20°C
-1.0(at 25℃)
White to almost white
Specific Gravity
6-8 (50g/l, H2O, 20℃)
PH Range
5 - 7
Water Solubility 
13.6 g/100 mL (20 ºC)
Stable. Incompatible with strong acids, strong bases, strong oxidizing agents, metallic salts, proteins, hydrocarbons. May react violently with acrolein.
Substances Added to Food (formerly EAFUS)
CAS DataBase Reference
62-56-6(CAS DataBase Reference)
EWG's Food Scores
NCI Dictionary of Cancer Terms
NIST Chemistry Reference
3 (Vol. Sup 7, 79) 2001
Proposition 65 List
EPA Substance Registry System
Thiourea (62-56-6)
  • Risk and Safety Statements
Signal word  Warning
Hazard statements  H302-H351-H361d-H411-H361
Precautionary statements  P280-P301+P312a-P405-P501a-P201-P273-P301+P312+P330-P308+P313-P391-P501
Hazard Codes  Xn,N,Xi
Risk Statements  22-40-51/53-63-43-38
Safety Statements  36/37-61
RIDADR  UN 2811 6.1/PG 3
WGK Germany  2
RTECS  YU2800000
Autoignition Temperature 440 °C Dust
HazardClass  6.1
PackingGroup  III
HS Code  29309070
Toxicity LD50 orally in wild Norway rats: 1830 mg/kg (Dieke)
NFPA 704
2 0

Thiourea price More Price(24)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 30885 Thiourea ≥99.999% (metals basis) 62-56-6 5g $227 2020-08-18 Buy
Sigma-Aldrich PHR1758 Thiourea Pharmaceutical Secondary Standard; Certified Reference Material 62-56-6 200mg $256 2020-08-18 Buy
TCI Chemical T2835 Thiourea [for Biochemical Research] >99.0%(T) 62-56-6 5g $20 2020-06-24 Buy
TCI Chemical T2835 Thiourea [for Biochemical Research] >99.0%(T) 62-56-6 25g $40 2020-06-24 Buy
Alfa Aesar 036609 Thiourea, ACS 99% min. 62-56-6 50g $31 2020-06-24 Buy

Thiourea Chemical Properties,Uses,Production


Thiourea appears as white crystal/powder, is combustible, and on contact with fire, gives off irritating or toxic fumes/gases. Thiourea is a reducing agent used primarily in the production of bleached recycled pulp. In addition, it is also effective in the bleaching of stone groundwood, pressurised groundwood. Thiourea undergoes decomposition on heating and produces toxic fumes of nitrogen oxides and sulphur oxides. It reacts violently with acrolein, strong acids, and strong oxidants. The main application of thiourea is in textile processing and also is commonly employed as a source of sulphide. Thiourea is a precursor to sulphide to produce metal sulphides, for example, mercury sulphide, upon reaction with the metal salt in aqueous solution. The industrial uses of thiourea include production of flame-retardant resins and vulcanisation accelerators. Thiourea is used as an auxiliary agent in diazo paper, light-sensitive photocopy paper, and almost all other types of copy paper. Thiourea is used in many industrial applications, including as a chemical intermediate or catalyst, in metal processing and plating, and in photoprocessing.

Chemical Properties

Thiourea consists of colorless, lustrous crystals or powder with a bitter taste.

Chemical Properties

white crystals or powder


The product is wildly used in pharmaceutical industry, agricultural, chemicals, metallurgical industry, petroleum and so on. It is also main material for producing thiourea dioxide(CH1N2O2S).


Chaotropic agent; strong denaturant. Increases solubility and recovery of proteins


Used in determination of bismuth.


In animal glue liquifiers and silver tarnish removers. Photographic fixing agent and to remove stains from negatives; manufacture of resins; vulcanization accelerator; a reagent for bismuth, selenite ions.


Thiourea is used in the manufacture of resins,as a vulcanization accelerator, and as aphotographic fixing agent and to removestains from negatives.


The most common uses for thiourea have been for the production of thiourea dioxide (30%), in leaching of gold and silver ores (25%), in diazo papers (15%), and as a catalyst in the synthesis of fumaric acid (10%) (IARC 2001). It has also been used in the production and modification of synthetic resins. Other uses of thiourea are as a photographic toning agent, in hair preparations, as a drycleaning agent, in the synthesis of pharmaceuticals and pesticides, in boiler-water treatment, and as a reagent for bismuth and selenite ions. It has also been used in textile and dyeing auxiliaries, in the production of industrial cleaning agents (e.g., for photographic tanks and metal surfaces in general), for engraving metal surfaces, as an isomerization catalyst in the conversion of maleic to fumaric acid, in copper-refining electrolysis, in electroplating, and as an antioxidant. Other uses have included as a vulcanization accelerator, an additive for slurry explosives,as a viscosity stabilizer for polymer solutions, and as a mobility buffer in petroleum extraction. It is also used as an ingredient of consumer silver polishes (HPD 2009), and has been used in the removal of mercury from wastewater by chlorine-alkali electrolysis (IARC 1974, 2001, WHO 2003).

Production Methods

Thiourea is formed by heating ammonium thiocyanate at 170 °C (338 °F). After about an hour, 25% conversion is achieved. With HCl, thiourea forms thiourea hydrochloride; with mercuric oxide, thiourea forms a salt; and with silver chloride, it forms a complex salt.


A colorless crystalline organic compound (the sulfur analog of urea). It is converted to the inorganic compound ammonium thiocyanate on heating. It is used as a sensitizer in photography and in medicine.


thiourea: A white crystalline solid,(NH2)2CS; r.d. 1.4; m.p. 182°C. It isused as a fixer in photography.


ChEBI: The simplest member of the thiourea class, consisting of urea with the oxygen atom substituted by sulfur.

General Description

White or off-white crystals or powder. Sinks and mixes with water.

Air & Water Reactions

Water soluble.

Reactivity Profile

Thiocarbamide is a white crystalline material or powder, toxic, carcinogenic. When heated to decomposition Thiocarbamide emits very toxic fumes of oxides of sulfur and oxides of nitrogen. Violent exothermic polymerization reaction with acrylaldehyde (acrolein) [MCA SD-85, 1961], violent decomposition of the reaction product with hydrogen peroxide and nitric acid [Bjorklund G. H. et al., Trans. R. Soc. Can.,1950, 44, p. 28], spontaneous explosion upon grinding with potassium chlorate [Soothill, D., Safety Management, 1992, 8(6), p. 11].


A questionable carcinogen. May not be used in food products (FDA); skin irritant (allergenic).

Health Hazard

Poisonous inhaled or swallowed. Irritating to skin; may cause allergic skin eruptions.

Health Hazard

The acute oral toxicity of thiourea in mostanimals is of low order. The oral LD50 values reported in the literature show variation.Symptoms of chronic effects in rats includebone marrow depression and goiters. Administration of 32.8 mol of thiourea in chickembryos on day 17 of incubation resultedin the accumulation of parabronchial liquidin those embryos (Wittman et al. 1987). Theinvestigators have attributed such changes tothe toxic effects of thiourea, rather to than aretardation of pulmonary development.
Dedon and coworkers (1986) observed thepossible protective action of thiourea againstplatinum toxicity. Thiourea and other sulfur-containing nucleophiles have the ability tochelate and remove platinum from biochemical sites of toxicity.
Oral administration of thiourea resultedin tumors in the liver and thyroid in rats.It is carcinogenic to animals and has shownsufficient evidence.

Fire Hazard

Noncombustible solid. There is no report of any explosion resulting from reactions of thiourea. Small amounts of thiourea in contact with acrolein may polymerize acrolein, which is a highly exothermic reaction.

Agricultural Uses

Thiourea is a sulphur analogue of urea. It is a crystalline and colorless solid which is relatively insoluble in water. Thiourea, capable of breaking the dormancy of seeds, is used to stimulate seed germination. Seeds are soaked for less than 24 hours before planting.

Contact allergens

Thiourea is used as a cleaner agent for silver and cop- per, and as an antioxidant in diazo copy paper. It can induce (photo-) contact dermatitis.

Potential Exposure

Thiourea is used as rubber antiozonant, toning agent; corrosion inhibitor; and in pharmaceutical manufacture; in the manufacture of photosensitive papers; flame-retardant textile sizes; boiler water treatment. It is also used in photography; pesticide manufacture; in textile chemicals.


Thiourea is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.


UN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

Purification Methods

Crystallise thiourea from absolute EtOH, MeOH, acetonitrile or water. Dry it under vacuum over H2SO4 at room temperature. [Beilstein 3 IV 342.]


Dust may form explosive mixture with air. Reacts violently with acrolein, strong acids (nitric acid). Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.

Thiourea Preparation Products And Raw materials

Raw materials

Preparation Products

Thiourea Suppliers

Global( 418)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Shandong chuangyingchemical Co., Ltd.
18853181302 CHINA 5917 58
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21869 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22623 55
Hangzhou FandaChem Co.,Ltd.
0086 158 5814 5714 (Mobile
+86-571-56059825 CHINA 3275 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 2754 55
Hebei Chishuo Biotechnology Co., Ltd.
13292891350 +86 311 66567340 CHINA 996 58
career henan chemical co
+86-371-86658258 CHINA 30037 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28231 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 10375 58
hdzhl biotechnology co., ltd
86-13032617415 CHINA 1277 58

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View Lastest Price from Thiourea manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2020-07-02 Thiourea
US $1.20 / Kg/Bag 1T 99%;98.8%;98% 3000tons/month Hebei Yanxi Chemical Co., Ltd.
2020-06-30 Thiourea
US $1650.00 / T 25KG 99% 20Ton Hebei Mojin Biotechnology Co., Ltd
2019-12-17 Thiourea
US $1.00 / KG 1KG 99% KG/T Career Henan Chemical Co

Thiourea Spectrum

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