Contact Us
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
© 2025 Alchemist Worldwide Ltd, All Right Reserved
Product Name: L-Cysteine Monohydrochloride
Chemical Formula: C3H7NO2S·HCl
CAS Number: 52-89-1
EC Number: 200-158-2
Recommended Use: Laboratory chemical, pharmaceutical intermediate, food additive
Supplier Information: Manufacturer or distributor address, contact details, emergency phone number
Synonyms: L-Cysteine HCl Monohydrate, L-2-Amino-3-mercaptopropionic acid hydrochloride, L-Cysteine hydrochloride monohydrate
Classification: Classified under GHS as irritant to eyes and skin
Hazard Pictograms: GHS07 (exclamation mark)
Signal Word: Warning
Hazard Statements: Causes serious eye irritation, may cause skin irritation, may cause respiratory distress with prolonged or repeated exposure
Precautionary Statements: Avoid breathing dust, wash hands thoroughly after handling, wear eye protection and gloves, use only in well-ventilated areas
Potential Health Effects: Contact with eyes may cause redness or pain, inhalation of dust might irritate the respiratory tract; ingestion can result in mild gastrointestinal upset
Chemical Name: L-Cysteine Monohydrochloride
Concentration: 99% or greater
Impurities: Trace water content (monohydrate form), no hazardous impurities above reporting limits
Molecular Weight: 175.64 g/mol
Common Additives: None
Hazardous Components: L-Cysteine hydrochloride monohydrate present as main component
Eye Contact: Rinse immediately with plenty of clean water, keep eyelids open and flush for at least 15 minutes, seek medical advice if irritation persists
Skin Contact: Remove contaminated clothing, rinse skin with soap and plenty of water, consult a doctor if discomfort occurs
Inhalation: Move person to fresh air, keep at rest, if symptoms such as coughing or respiratory discomfort develop, consult a medical professional
Ingestion: Rinse mouth with water, drink water to dilute, do not induce vomiting unless instructed by medical professionals, seek medical help for persistent symptoms
Note to Physician: Symptomatic treatment, no specific antidote known
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide as appropriate
Specific Hazards: Product may release toxic gases, such as hydrogen chloride or sulfur oxides, under fire conditions
Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective clothing to prevent contact with skin and eyes
Fire Fighting Instructions: Cool exposed containers with water spray, avoid breathing smoke or combustion products; remove containers from danger zone if safe
Explosion Data: Not sensitive to mechanical impact or static discharge in standard forms
Personal Precautions: Wear protective gloves, safety goggles, dust mask or respirator; ensure adequate ventilation in area of spill
Environmental Precautions: Prevent powder from entering drains, surface water, or soil; inform authorities if large quantities are released
Cleanup Methods: Sweep up without creating dust, place in a suitable container for disposal, clean affected area thoroughly with water
Waste Handling: Package during cleanup for controlled disposal, use appropriate receptacles labeled for chemical waste
Precautions for Safe Handling: Use local exhaust or respiratory protection if dust is generated, avoid contact with skin and eyes, handle in accordance with good industrial hygiene and safety practice
Conditions for Safe Storage: Store in tightly sealed containers in a cool, dry, well-ventilated place, away from incompatible substances like strong oxidizers or bases, avoid humid or wet areas to prevent product degradation
Recommended Packaging Materials: Use corrosion-resistant, well-labeled and sealed packaging to prevent ingress of moisture
Storage Temperature: Store between 2°C and 8°C for maximum stability; freezing not required
Exposure Limits: No occupational exposure limits assigned specifically for this compound; general dust exposure limits may apply (e.g., 10 mg/m³ total dust)
Engineering Controls: Use process enclosures, local exhaust ventilation, or other engineering controls to keep airborne levels below recommended limits
Personal Protective Equipment: Gloves (nitrile, latex), lab coats, safety goggles or splash-proof glasses; use a dust mask or respirator (N95 or equivalent) if exposure risks exist
Hygiene Measures: Wash hands after handling, do not eat or drink near the product, remove contaminated clothing before entering break areas
Appearance: White crystalline powder
Odor: Slight characteristic or sulfurous odor
pH: 1.5–2.5 (10% aqueous solution)
Melting Point: 175 °C (decomposition)
Boiling Point: Not applicable (decomposes)
Solubility: Easily soluble in water
Vapor Pressure: Negligible at room temperature
Specific Gravity: About 1.3–1.4 (water=1)
Partition Coefficient: Not available
Flash Point: Not flammable
Auto-Ignition Temperature: Not determined
Chemical Stability: Stable under recommended handling and storage conditions
Reactive Conditions: Product can react with strong oxidizing agents and strong bases, avoid contact with heat, moisture, and incompatible substances
Hazardous Decomposition: Hydrogen chloride gas, sulfur oxides, nitrogen oxides may form at elevated temperatures or under fire conditions
Polymerization: No hazardous polymerization expected
Acute Toxicity: Oral LD50 in rats estimated above 1,000 mg/kg; low acute toxicity with normal use
Skin Irritation: Mild to moderate irritation possible in case of direct and prolonged contact
Eye Irritation: Causes strong irritation, pain, tearing if in direct contact
Respiratory Sensitization: Irritating effects possible if inhaled, especially for those with pre-existing respiratory conditions
Chronic Effects: No evidence of carcinogenicity or mutagenicity; safe under typical industrial hygiene practices
Other Health Effects: Prolonged exposure could cause dryness or rash on skin
Ecotoxicity: No specific data for aquatic toxicity provided, but no evidence suggests significant environmental hazard at recommended usage rates
Persistence and Degradability: Organic molecule likely to break down under normal conditions; expected to degrade in sewage-treatment processes
Bioaccumulative Potential: Not expected to bioaccumulate
Mobility in Soil: Water-soluble, can leach through soil with rainwater; low persistence predicted
Other Adverse Effects: Avoid uncontrolled release to waterways due to possible localized effects
Disposal Methods: Collect and place in tightly closed containers, dispose of in accordance with local, regional, or national regulations for hazardous chemical waste
Packaging Handling: Clean empty containers thoroughly, dispose in approved waste facility; do not reuse packaging for non-chemical purposes
Environmental Consideration: Do not dispose to sewer or environment; incinerate if possible in well-controlled facilities
UN Number: Not classified as dangerous goods for transport under UN, IMDG, IATA, or ADR
Proper Shipping Name: L-Cysteine Monohydrochloride
Transport Hazard Class: Not regulated
Packing Group: Not regulated
Special Precautions: Avoid transport with incompatible substances (oxidizers, bases); transport in well-sealed containers to prevent spillage or moisture ingress
Labelling: GHS-compliant symbols and hazard cautions required
Inventory Status: Listed on major inventories including TSCA (USA), EINECS (Europe), DSL (Canada), AICS (Australia), ENCS (Japan), and other relevant lists
Workplace Safety Compliance: Workers must follow OSHA guidelines for handling, PPE, storage, and emergency action
Food/Pharmaceutical Regulations: Product approved by authorities like the FDA for food additive and pharmaceutical use, following specific purity and application limitations
Other Regulations: No special SARA, CERCLA or EPCRA reporting requirements except as noted in local guidance
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
