Product Name: Benzenesulfonic Acid Monohydrate
Chemical Family: Aromatic sulfonic acids
Synonyms: Phenylsulfonic acid monohydrate
CAS Number: 81-11-8
Recommended Use: Organic synthesis, surfactants, catalyst, chemical research
Manufacturer or Supplier Details: Provided on label or request
Emergency Contact Number: Reference local regulations or supplier information
Classification: Corrosive to metals (Category 1), Skin corrosion (Category 1B), Serious eye damage (Category 1)
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage, may corrode or degrade metals, may cause respiratory irritation
Pictograms: Corrosion, Exclamation mark
Precautionary Statements: Avoid inhalation of dust or fumes, prevent contact with skin and eyes, do not eat, drink or smoke while handling, use only non-sparking tools, wash thoroughly after handling, wear chemical-resistant protection
Chemical Name: Benzenesulfonic Acid Monohydrate
CAS Number: 81-11-8
Concentration: ≥98%
Impurities: Water (monohydrate), trace sulfonated derivatives
Molecular Formula: C6H6O4S·H2O
Molecular Weight: 176.20 g/mol
Inhalation: Remove person from exposure area to fresh air, keep at rest in a position comfortable for breathing, provide oxygen or artificial respiration if needed, seek immediate medical attention
Skin Contact: Flush skin with copious amounts of water for at least 15 minutes, remove contaminated clothing and shoes, get medical attention
Eye Contact: Rinse cautiously with water for several minutes, hold eyelids open to ensure thorough rinsing, remove contact lenses if present and easy to do, continue rinsing and seek urgent medical care
Ingestion: Do not induce vomiting, rinse mouth thoroughly with water if conscious, never give anything by mouth to an unconscious person, get medical help right away
Most Important Symptoms/Effects: Severe burns, irritation and pain on skin or mucous membranes, intense eye damage including risk of blindness, respiratory tract irritation, gastrointestinal tract burns
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Unsuitable Extinguishing Media: High-pressure water jets (may spread product)
Special Hazards: Material may decompose under fire conditions releasing toxic sulfur oxides, carbon oxides and other hazardous gases
Protective Equipment for Firefighters: Wear self-contained breathing apparatus, full protective suit including boots, gloves, helmet with face shield
Specific Tactics: Isolate hazard area, fight fire from safe distance or protected location, cool exposed containers with water
Personal Precautions: Evacuate unnecessary personnel, equip responders with chemical-resistant clothing, respiratory protection, ensure adequate ventilation
Environmental Precautions: Prevent entry into sewers, waterways, basements or confined spaces, notify authorities if significant release occurs
Methods for Cleaning Up: Neutralize spill with dilute sodium bicarbonate or lime, absorb with inert material such as sand or vermiculite, collect in suitable container for disposal
Additional Advice: Clean contaminated surfaces thoroughly, ventilate area, dispose of according to legal requirements
Handling: Store in original tightly closed container, use only with proper exhaust ventilation, avoid breathing dust, fumes or vapors, avoid skin and eye contact, wash hands and face before eating or drinking
Storage: Keep container tightly sealed in cool, dry, well-ventilated area away from incompatible substances like strong bases, strong oxidizers and metals, avoid moisture exposure, clearly label storage container
Incompatibilities: Strong alkaline materials, reducing agents, metal powders (possible hydrogen gas release), organic materials that can react violently
Recommended Packaging Materials: Glass, polyethylene, compatible corrosion-resistant materials
Occupational Exposure Limits: No established OSHA or ACGIH exposure limits; minimize exposure due to corrosivity
Engineering Controls: Use local exhaust ventilation, laboratory fume hood, safety shower and eye wash stations in work areas
Personal Protective Equipment: Chemically resistant gloves (nitrile, neoprene), safety goggles or full face shield, long-sleeved lab coat or chemical apron, respirator with acid gas cartridge if ventilation is inadequate
Hygiene Measures: Remove contaminated clothing and wash before reuse, avoid ingestion and inhalation, keep work area clean, do not touch face or eyes while working
Appearance: White to off-white crystalline powder
Odor: Slight aromatic or sulfurous
Odor Threshold: Not available
pH: Strongly acidic in water
Melting Point/Freezing Point: 41–43°C (106–110°F)
Boiling Point: Decomposes before boiling
Flash Point: Not flammable
Evaporation Rate: Not relevant (solid)
Flammability: Not classified as flammable
Vapor Pressure: Negligible at room temperature
Vapor Density: Not applicable
Relative Density: ~1.35–1.37 g/cm³ (monohydrate)
Solubility: Readily soluble in water, soluble in ethanol
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: Not self-igniting
Decomposition Temperature: >170°C
Viscosity: Not applicable
Chemical Stability: Stable under recommended conditions, may absorb moisture from air
Conditions to Avoid: Heat, moisture, prolonged exposure to air, contact with incompatible chemicals
Incompatible Materials: Strong bases, reducing agents, reactive metals like sodium, potassium, organic combustibles
Hazardous Decomposition Products: Sulfur oxides (SOx), carbon oxides (CO, CO2), benzene
Possibility of Hazardous Reactions: Violent reactions with strong bases and oxidizers, gas release with metal powders
Acute Toxicity: Data suggest low oral LD50 in laboratory animals (>2000 mg/kg in rats), exact values vary by form and testing protocol
Skin Corrosion/Irritation: Strong corrosive action results in ulceration, blistering, severe burns
Eye Damage/Irritation: Rapid onset of pain, redness, severe tissue damage, possible permanent vision loss
Respiratory Sensitization: Dust or fumes may cause severe nasal and lung irritation, pulmonary edema with prolonged exposure
Germ Cell Mutagenicity: Not classified as mutagenic based on available data
Carcinogenicity: Not listed by IARC, NTP, OSHA as a known or suspected carcinogen
Reproductive Toxicity: Data not sufficient for assessment
Target Organ Effects: Skin, eyes, mucous membranes, upper respiratory tract
Symptoms: Burning sensation, coughing, shortness of breath, abdominal pain, vomiting
Ecotoxicity: May cause acidification and toxic effects in aquatic environments, dangerous to aquatic organisms based on structural analogs
Persistence and Degradability: Biodegradable under aerobic conditions, but persistence possible in poorly oxygenated systems
Bioaccumulation Potential: Low potential due to water solubility
Mobility in Soil: High mobility, leaches to groundwater
Other Adverse Effects: Exothermically reacts with water causing pH drop, avoid large accidental releases to surface water or soil
Waste Treatment Methods: Neutralize with alkaline materials before disposal, conform to local regional, national and international regulations
Contaminated Packaging: Empty containers must be triple rinsed, decontaminated before recycling or disposal, incinerate residues as chemical waste
Disposal Guidance: Consult authorized waste disposal company, do not allow unauthorized disposal in environment or sewage system
UN Number: UN2585
UN Proper Shipping Name: Benzenesulfonic acid
Transport Hazard Class: 8 (corrosive substances)
Packing Group: II
Marine Pollutant: Not classified as marine pollutant
Special Precautions: Secure containers, prevent spillage, mark with correct hazard labels
Land Transport (DOT): Classified as hazardous, consult DOT Table for precise shipping requirements
Sea Transport (IMDG): IMDG class 8, packing group II, emergency schedules as per code
Air Transport (IATA): IATA class 8, packing group II, follow IATA dangerous goods protocols
TSCA Inventory: Listed
SARA 313: Not subject to reporting
SARA 302: Not listed as an extremely hazardous substance
SARA 311/312: Acute health hazard (corrosive), not considered flammable or reactive
REACH Registration: Compliant for import to European Union as appropriate
Other Regulations: Check local, state, and national environmental and workplace safety regulations for further restrictions or reporting rules
Labeling Requirements: Clearly label hazard class, signal word, hazard pictograms in accordance with GHS and OSHA standards
