Thiourea 99% (CS(NH2)2) is classified as a dangerous chemical with the following properties:

• Appearance: White crystal powder
• Density: 1.405 g/cm³
• Molecular weight: 76.12 g/mol
• Melting point: 171-175℃
• Boiling point: 349 to 352°F (NTP, 1992)

CAS: 62-56-6
Product meets GB/8218-2018 standards:

Thiourea is an organic sulfur compound with the formula SC(NH2)2 and the structure H2N−C(=S)−NH2. Its structure is similar to urea (H2N−C(=O)−NH2), but oxygen atoms are replaced by sulfur atoms. The properties of urea and thiourea are very different. Thiourea is an organic synthesis reagent and a broad class of compounds with the formula SC(NHR)(NH2), SC(NHR)2, etc.

• Acid-base: Weakly basic, can react with acids to form salts
• Reducibility: Can be oxidized by oxidants (hydrogen peroxide, potassium permanganate)
• Complexation: Forms complexes with metal ions (Ag+, Au+, Cu²+)
• Thermal stability: Decomposes when heated above melting point, producing ammonia and hydrogen sulfide
• Hydrolysis: Hydrolyzes under acidic/alkaline conditions to produce urea and hydrogen sulfide

• Weak acidity/reducing property: Aqueous solution is weakly acidic (pH≈6-7), minimal corrosiveness to common metals but may affect copper with long-term contact
• Reaction with oxidants: Mixing with strong oxidants may produce irritating gases (sulfur dioxide)

• Toxicity: Oral ingestion, inhalation or skin contact may pose health risks (potential carcinogen classified as IARC Group 3)
• Irritation: May irritate eyes, skin and respiratory tract, cause allergic reactions
• Environmental risk: Degradation may produce toxic sulfur compounds requiring professional waste treatment

• Wear gloves, goggles and dust masks during handling
• Ensure good ventilation, especially when heating or preparing solutions
• Store in sealed containers in cool, dry places away from oxidants and food