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West Ujimqin Banner, Xilingol League, Inner Mongolia, China
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Product Name: Calcium Hydroxide
Synonyms: Hydrated lime, slaked lime, pickling lime
Chemical Formula: Ca(OH)2
CAS Number: 1305-62-0
Recommended Use: Building material, water treatment, chemical manufacturing, soil stabilization
Manufacturer Information: Obtain contact details from supplier or product packaging for emergencies, technical details, or further safety queries
Emergency Phone: Refer to appropriate country or regional emergency contact numbers connected to poison control or hazardous material response
UN Number: 3262
EC Number: 215-137-3
Classification: Skin and serious eye irritation, respiratory hazard if dust is inhaled
Hazard Symbols: Corrosive (C), Irritant (Xi)
Risk Phrases: Causes severe skin burns and eye damage; may cause respiratory irritation
GHS Label Elements: Danger, Corrosive, Exclamation Mark
Routes of Exposure: Inhalation, ingestion, skin or eye contact
Health Risks: Eye blindness from direct exposure, severe skin dryness, long-term irritation of the respiratory tract
Environmental Effects: High concentrations may alter local pH, harmful to aquatic and terrestrial plants
Chemical Identity: Calcium Hydroxide
Purity: Usually >95% Ca(OH)2
Impurities: Small amounts of magnesium oxide, calcium carbonate, silica may be present depending on source
Hazardous Components: No intentional additives, pure chemical compound
Additional Ingredients: Trace elements from manufacturing process may include clay, excessive dust particulates
Inhalation: Remove from dust area to fresh air, seek medical attention if coughing or breathing difficulty continues
Skin Contact: Wash exposed skin areas under running water with plenty of soap; remove contaminated clothing
Eye Contact: Flush with lukewarm water for at least 15 minutes holding eyelids open, immediate medical examination needed
Ingestion: Rinse mouth, drink water slowly, don’t induce vomiting, obtain urgent medical advice; damage may occur from chemical burns
Most Important Symptoms: Redness, pain, blistering, permanent eye injury possible, throat or lung irritation depending on route and exposure level
Suitable Fire Extinguishing Media: Use dry chemical, foam, or CO2 for surrounding fires; chemical itself does not burn
Unsuitable Extinguishing Media: Water stream may cause violent reaction if calcium hydroxide is hot or mixed with specific metals
Specific Hazards: Releases heat and can react with water, metal, and acids
Protective Equipment for Firefighters: Self-contained breathing apparatus and full chemical-resistant suit, avoid inhalation of fumes or reaction products
Hazardous Combustion Products: No hazardous combustion gases, may release steam or cause splattering if spilled on fire area
Personal Precautions: Wear tight-fitting goggles, N95 respirator, protective gloves and long-sleeved clothing
Environmental Precautions: Prevent material from entering sewers, drainage, or water sources
Spill Clean-Up Methods: Avoid dust generation, sweep up bulk carefully and place in covered, properly labeled containers; collect residue using HEPA vacuum or damp sweeping
Disposal: Dispose remnants according to local hazardous waste regulations, avoid open dumping
Special Notes: Ventilate area thoroughly if indoor spill occurs, restrict access until finished
Safe Handling: Avoid skin and eye contact, reduce dust formation, use only in well-ventilated areas
Eating/Drinking/Smoking Prohibition: Do not eat, drink or smoke when using the chemical
Storage Conditions: Store in tightly closed, corrosion-resistant containers in a dry, cool, well-ventilated location
Incompatible Materials: Keep away from acids, ammonium salts, moisture, aluminum, and organic materials
Stability Precautions: Do not store near foodstuffs, water-reactive chemicals or where exposure to dampness could cause caking or increase corrosion risk
Occupational Exposure Limits: OSHA PEL/TWA: 5 mg/m3 (respirable dust), ACGIH TLV: 5 mg/m3 (respirable fraction)
Engineering Controls: Local exhaust ventilation, dust collection systems, sealed handling lines
Personal Protection: NIOSH/MSHA approved respirator for nuisance dust, chemical-resistant gloves, splash-proof goggles, protective suit if potential for splashing
Emergency Equipment: Eyewash stations and safety showers available where calcium hydroxide handled or used
Hygienic Practices: Hands and face washed thoroughly after use, contaminated uniforms removed and washed before reuse
Appearance: White powder or crystalline solid
Odor: Odorless
pH: Strongly alkaline, pH 12.4 in aqueous solution
Melting Point: Decomposes at ~580 °C (no boiling point)
Solubility: 1.7 g/L in a cold water solution
Density: 2.24 g/cm3
Vapor Pressure: Negligible at normal conditions
Vapor Density: Not applicable, non-volatile
Other Properties: Easily forms dust, absorbs moisture and CO2 from air (hygroscopic and reacts to form calcium carbonate on exposure to air)
Chemical Stability: Stable under recommended storage conditions, reacts slowly with CO2 or acids
Possible Hazards: Exothermic reaction with water, heat generation and vigorous bubbling with strong acids
Incompatibilities: Strong acids, ammonium salts, light metals (aluminum, zinc), moisture
Hazardous Decomposition: No hazardous fumes under normal use, decomposes to calcium oxide and water at high temperature
Polymerization: Not applicable for calcium hydroxide
Acute Toxicity: Oral LD50 (rat): 7,340 mg/kg; not acutely toxic by inhalation within occupational settings
Eye and Skin Effects: Severe irritation, possible corneal burns, eye damage, skin redness or blistering upon prolonged exposure
Respiratory Effects: Prolonged or repeated inhalation may aggravate asthma or chronic bronchitis
Ingestion Symptoms: Severe mouth, throat, stomach burns, nausea, vomiting, risk of perforation of GI tract
Chronic Toxicity: Repeated skin contact may cause dermatitis or prolonged respiratory irritation
Carcinogenicity: Not classifiable as a carcinogen by OSHA, NTP, IARC or ACGIH based on available data
Persistence: Calcium hydroxide reacts in nature to form less soluble calcium carbonate
Toxicity to Aquatic Life: Alters pH, highly alkaline releases harm aquatic organisms at high concentration
Mobility: Water solubility may allow spreading, precipitation by CO2 stabilizes in soil
Bioaccumulation: Not expected in animals or plants, does not bioaccumulate
Soil Impact: Alters pH, risks damaging local soil microflora; otherwise, binds quickly, risk drops after neutralization
Waste Treatment Methods: Place in approved landfill after neutralization, avoid sewer or natural water disposal
Unused Material: Clean spills collected in sealed drums, label according to local hazardous waste codes
Contaminated Packaging: Triple rinse before scrap metal recovery or proper landfill
Relevant Regulations: Comply with national, state, or provincial guidelines for corrosive materials
Environmental Protection: Avoid spread into water bodies, use secondary containment for large storage or disposal
UN Number: 3262
UN Proper Shipping Name: Corrosive solid, basic, inorganic, n.o.s. (Calcium Hydroxide)
Transport Hazard Class: 8 (corrosive materials)
Packing Group: III
Special Precautions: Secure loads to prevent tipping and dust escape, keep containers dry and intact
Labeling Requirements: Corrosive label, shipping documents must reflect correct hazard designation
Transportation Modes: Ship in sealed containers, avoid bulk transport if risk of exposure is high
OSHA Status: Regulated under hazardous chemicals list
TSCA Inventory: Listed
SARA 313: Not subject to reporting
WHMIS Classification (Canada): D2B (toxic), E (corrosive)
REACH (EU): Registered, standard restrictions on irritant and corrosive substances
Other Local Regulations: May be subject to regional workplace safety and environment reporting rules, refer to local government directories for specific guidance
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
