Thiourea

CAS Number
62-56-6
EC Number
200-543-5
Abbreviation
(NH2)2CS.

What is Thiourea?

Thiourea (CAS 62-56-6) is an organosulfur compound used as a reducing agent, complexing agent, and reaction intermediate.

Where is Thiourea used?

  • Pharmaceutical manufacturing: intermediate in synthesizing active compounds, including certain antithyroid drugs and antimicrobial agents
  • Printing and packaging: photographic fixing baths and toning solutions, where metal-complexing behavior controls image development chemistry and stability
  • Textile and leather processing: reducing agent for bleaching and surface preparation
  • It also functions as a catalyst precursor in hydrothermal synthesis routes for sulfide-based nanomaterials and pigments.

Commercial specifications

  • Purity typically specified at 99% or above for most commercial grades
  • Higher-purity grades meet pharmaceutical or reagent specifications
  • Standard packaging from small laboratory quantities to bulk industrial quantities

Other Names (Synonyms)

thiocarbonic acid diamide|carbonothioic diamide|2-thiourea|Sulfourea|Sulourea|2-Thiopseudourea|Urea, thio-|Pseudourea, 2-thio-|(NH2)2CS.

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What are the physical properties of Thiourea?

Melting Point 176-178 °C
Boiling Point 150-160 °C
Density 1.405 g/cm³
Appearance Thiourea consists of colorless, lustrous crystals or powder with a bitter taste.
Color White to almost white
Odor Odorless
Form Crystals
Water Solubility 13.6 g/100 mL (20 ºC)
Refractive Index 1.5300 (estimate)
pH 6-8 (50g/l, H2O, 20℃)
Log P -1.050 (est)

How is Thiourea classified and handled safely? Learn More

Warning
GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard

Hazard Statements

H302 Harmful if swallowed
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H320 Causes eye irritation

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.

Which trade and regulatory codes apply to Thiourea?

HS Code 29309070
UN Number 2811
ADR Class 6.1
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2
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