Product Name: Imidazolidine-2-Thione
Synonyms: 2-Imidazolidinethione, Ethylene thiourea
CAS Number: 96-45-7
Recommended Use: Industrial applications, vulcanization accelerator in rubber manufacturing
Supplier Contact: Emergency phone, email, and physical address on product packaging or company website
Classification: Acute toxicity (oral, inhalation), skin sensitizer, suspected carcinogen
Signal Word: Warning
Hazard Statements: Harmful if swallowed, toxic if inhaled, possible cancer risk, may cause allergic skin reaction
Pictograms: Exclamation mark, health hazard
Precautionary Statements: Avoid breathing dust or fumes, use gloves and eye protection, wash hands thoroughly after handling, do not eat or drink near work area, obtain special instructions before use for pregnant workers
Chemical Name: Imidazolidine-2-Thione
Common Name: ETU (Ethylene Thiourea)
Purity: ≥99%
Other Components: No significant impurities considered hazardous based on available data
Inhalation: Move exposed person to fresh air, keep warm and at rest, apply artificial respiration if breathing stops, seek immediate medical attention
Skin Contact: Remove contaminated clothing, wash skin with plenty of soap and water, seek medical advice if irritation develops
Eye Contact: Rinse cautiously with water for at least 15 minutes, remove contact lenses if present and easy to do, continue rinsing, get medical attention if discomfort persists
Ingestion: Rinse mouth, do not induce vomiting, seek urgent medical help
Most Important Symptoms: Nausea, headache, dizziness, skin irritation, possible respiratory symptoms, potential chronic effects on thyroid
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Unsuitable Extinguishing Media: Direct water jet may spread the chemical
Specific Hazards: Decomposes under fire releasing toxic gases including nitrogen oxides, sulfur oxides, hydrogen cyanide
Protective Equipment: Wear full protective gear, including self-contained breathing apparatus
Special Procedures: Avoid inhaling combustion products, cool containers with water spray, prevent run-off from entering drains or watercourses
Personal Precautions: Evacuate area, wear respiratory protection, chemical-resistant gloves, goggles
Environmental Precautions: Prevent entry to sewers, ditches, and water bodies, report spills to authorities as required
Containment Methods: Cover powder spill with damp material to limit dust, collect for safe disposal in appropriate container
Cleaning Up: Sweep up carefully, avoid raising dust, ventilate area, decontaminate surfaces with detergent and water
Safe Handling: Use only in well-ventilated areas, avoid inhalation and skin contact, wear protective clothing, keep containers closed between uses, avoid generation of dust
Safe Storage: Store in a tightly closed container, in a cool, dry, well-ventilated location away from direct sunlight and incompatible substances like oxidizers, strong acids, and bases
Other Precautions: Keep away from food, drinks, and animal feed, restrict access to trained personnel, store away from heat sources
Incompatible Materials: Strong acids, bases, oxidizing agents
Control Parameters: OSHA PEL not established, ACGIH TLV (inhalable fraction and vapor) 0.2 mg/m³
Engineering Controls: Local exhaust ventilation, eye wash stations, safety showers in work areas
Personal Protection: NIOSH-approved respirator for dust, chemical-resistant gloves (nitrile or neoprene), safety goggles with side shields, protective clothing to prevent skin contact
Hygiene Measures: Wash hands, forearms, and face thoroughly after handling and before eating or drinking, do not reuse contaminated clothing without thorough cleaning
Appearance: White to off-white crystalline powder
Odor: Slight sulfur-like odor
Molecular Formula: C3H6N2S
Molecular Weight: 102.16 g/mol
pH: Slightly acidic to neutral aqueous solution
Melting Point: 200–210°C (decomposes)
Boiling Point: Sublimes (decomposes before boiling)
Solubility: Slightly soluble in water, more soluble in organic solvents
Vapor Pressure: Negligible at room temperature
Flash Point: Not applicable (solid, decomposes on heating)
Density: 1.41 g/cm³
Partition Coefficient (log Kow): -0.38
Autoignition Temperature: Not self-igniting under standard conditions
Chemical Stability: Stable under recommended storage and handling conditions
Reactive With: Strong oxidizing agents, acids, bases
Decomposition Products: Releases toxic gases including nitrous oxides, sulfur oxides, and hydrogen cyanide under heat or fire
Polymerization: Not likely under normal conditions
Other: Avoid elevated temperatures, exposure to moisture may cause slow hydrolysis
Acute Toxicity (Oral): LD50 (rat) 195 mg/kg
Acute Toxicity (Dermal/Inhalation): Harmful effects demonstrated in animal studies
Skin Sensitization: May cause allergic skin reaction in sensitive individuals
Mutagenicity/Carcinogenicity: Suspected human carcinogen (IARC Group 2B), animal studies show reproductive and developmental toxicity
Symptoms of Exposure: Irritation to skin, eyes, respiratory tract; headache, dizziness, nausea, neurotoxicity with chronic exposure
Target Organs: Thyroid, nervous system
Chronic Health Effects: Possible effects on thyroid function, reproductive harm in animal studies
Aquatic Toxicity: Toxic to aquatic organisms, risk of long-term adverse effects in the aquatic environment
Persistence and Degradability: Does not rapidly biodegrade, remains in soils and water for extended periods
Bioaccumulation Potential: Low to moderate, not expected to significantly bioaccumulate in aquatic organisms
Mobility in Soil: Some mobility expected, follow local best practice to avoid environmental contamination
Other Information: Avoid release into natural waters and soil
Disposal Methods: Dispose through licensed waste specialist, observe all local, regional, national, and international regulations
Container Handling: Clean container before disposal or recycling, puncture to prevent reuse
Waste Classification: Considered hazardous waste under many global regulations
Environmental Precautions: Do not allow material or rinsate to enter drains, sewers, or watercourses
UN Number: 2811 (if shipped as a toxic solid)
Proper Shipping Name: Toxic Solid, Organic, N.O.S. (contains Imidazolidine-2-thione)
Transport Hazard Class: 6.1 (toxic material)
Packing Group: III
Labels Required: Toxic (skull and crossbones pictogram)
Special Precautions: Transport in compliance with national and international rules, secure containers to prevent spills, keep away from incompatible substances during transport
TSCA (US): Listed
OSHA: Considered hazardous substance
SARA Title III: Requires reporting for certain regulated quantities
REACH (EU): Subject to SVHC (Substances of Very High Concern) proposals, strict handling and use restrictions
IARC: Group 2B (possibly carcinogenic to humans)
Other Regulations: Listed by multiple national inventories, subject to workplace and environmental release controls, consult local authorities for full compliance
