Thiourea

Thiourea is an organosulfur compound with the chemical formula CH4N2S and CAS number 62-56-6. This white crystalline solid has a molecular weight of 76.12 g/mol and contains both sulfur and nitrogen atoms in its structure. It is classified as a hazardous chemical with carcinogenic and reproductive toxicity properties, requiring careful handling in industrial applications.

Thiourea is a white crystalline solid at room temperature with high water solubility. It has a molecular formula of CH4N2S and a molecular weight of 76.12 g/mol. The compound is stable under normal conditions but can decompose when heated. It exhibits good solubility in polar solvents and has a characteristic sulfur-containing structure that influences its chemical reactivity.

Thiourea is primarily used in photography as a fixing agent, in textile processing as a auxiliary chemical, and in metal processing for silver and gold recovery. It serves as an intermediate in pharmaceutical synthesis and is used in rubber vulcanization processes. Additionally, thiourea finds applications in analytical chemistry as a reagent and in electroplating operations for metal surface treatment.

Thiourea handling requires appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing due to its carcinogenic and reproductive toxicity classification. Work should be conducted in well-ventilated areas or under fume hoods. Avoid skin contact, inhalation, and ingestion. Emergency eyewash stations and safety showers should be readily accessible in work areas.

Thiourea should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Keep containers away from strong oxidizing agents and acids. Storage areas should be equipped with appropriate containment measures and access should be restricted to trained personnel only. Regular inspection of containers for damage or deterioration is recommended.

Skin contact with thiourea requires immediate removal of contaminated clothing and thorough washing with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for 15-20 minutes. If inhaled, move the person to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention. Always consult a physician after any significant exposure.

Thiourea disposal must comply with local and national hazardous waste regulations due to its classification as carcinogenic and environmentally hazardous. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Do not discharge into drains, waterways, or soil. Small quantities should be collected in appropriate containers and labeled for hazardous waste collection. Incineration at authorized facilities may be required.

Thiourea is classified as ADR Class 9 (miscellaneous dangerous goods), Packing Group III for transportation purposes. It requires appropriate UN packaging and labeling according to dangerous goods regulations. Transportation documents must include proper shipping names and hazard classifications. Vehicles should carry appropriate emergency equipment and drivers must have dangerous goods training certification for legal transport.

Thiourea is subject to REACH registration requirements and CLP classification as Carcinogenic Category 2, Reproductive Toxicity Category 2, and Acute Toxicity Category 4. It carries GHS pictograms GHS07, GHS08, and GHS09 with warning signal word. While not currently listed as a SVHC substance, its carcinogenic classification means it may be subject to authorization procedures and workplace exposure limits in various jurisdictions.

Thiourea is available through OYSI, a specialized European distributor of technical chemicals serving industrial customers across Europe. As a hazardous chemical requiring proper handling expertise, thiourea should only be purchased from qualified chemical distributors who can provide appropriate safety documentation, technical support, and ensure compliance with transportation and handling regulations for professional applications.