Chemical Name: 4-B Acid
Other Names: P-Toluidine O-Sulphonic Acid, 6-Amino Meta Toluene Sulphonic Acid, 2-Amino 5-Methyl Benzene Sulfonic Acid
CAS Number: 88-44-8
EC Number: 201-835-0
Recommended Use: Intermediate for dyes and pigments in chemical manufacturing
Manufacturer Details: Name, Address, Emergency Contact Number
Email: Contact email for safety inquiries
Emergency Phone: 24-hour number for chemical emergencies
Classification: Irritant, Harmful to aquatic life
Label Elements: Warning symbol (exclamation mark, environment)
Hazard Statements: Causes skin and eye irritation, may cause respiratory irritation, harmful if swallowed, toxic to aquatic organisms
Signal Word: Warning
Precautionary Statements: Wear protective gloves, avoid breathing dust, wash thoroughly after handling, use only outdoors or in well-ventilated areas, avoid release to the environment
Chemical Identity: 4-B Acid
Common Synonyms: P-Toluidine O-Sulphonic Acid, 6 Amino Meta Toluene Sulphonic Acid, 2-Amino 5-Methyl Benzene Sulfonic Acid
CAS Number: 88-44-8
Concentration: 98–100%
Impurities: May include minor toluene derivatives or sulfated by-products in trace amounts
Eye Contact: Rinse cautiously with water for at least 15 minutes, seek medical advice if irritation persists
Skin Contact: Remove contaminated clothing and wash skin thoroughly with soap and water, seek medical attention for persistent irritation
Inhalation: Move person to fresh air, keep comfortable for breathing, consult a physician if symptoms develop
Ingestion: Rinse mouth with water, do not induce vomiting, seek immediate medical advice
Note for Doctor: Treat symptoms, provide supportive care
Suitable Extinguishing Media: Use foam, carbon dioxide, dry chemical powder, water spray for extinguishing flames
Unsuitable Media: Solid water streams may scatter spill
Specific Hazards: Can emit toxic fumes of carbon oxides, sulfur oxides, and nitrogen oxides during decomposition
Special Protective Equipment: Firefighters should use self-contained breathing apparatus with full protective gear
Advice for Firefighters: Move containers away from fire area if safe, cool exposed containers with water spray
Personal Precautions: Avoid dust formation, use personal protective equipment including gloves and safety goggles
Environmental Precautions: Prevent further leakage or spillage, avoid runoff into drains, surface and ground water
Methods for Cleaning Up: Sweep or vacuum up material without generating dust, transfer to labeled containers for disposal, ventilate area and wash spill site after material pickup is complete
Emergency Procedures: Evacuate personnel to safe areas if large spills occur, ensure adequate ventilation during cleanup
Handling: Use only in well-ventilated areas, minimize dust generation and accumulation, avoid contact with skin and eyes, do not breathe dust, wear appropriate personal protective equipment
Storage: Store in a tightly closed container in a cool, dry, well-ventilated place away from incompatible materials such as oxidizers and acids, keep away from moisture and direct sunlight, ensure storage area has spill containment measures
Exposure Limits: No specific occupational exposure limits established, employ best industrial hygiene practices
Engineering Controls: Use local exhaust ventilation or process enclosures to reduce airborne dust, provide safety shower and eye wash stations
Personal Protective Equipment: Chemical safety goggles, face shield, impervious gloves, lab coat or coveralls, approved respirator in case of insufficient ventilation
Hygiene Measures: Wash hands after handling, remove contaminated clothing and clean before reuse, avoid eating/drinking or smoking in work areas
Physical State: Solid powder or crystalline
Color: White to off-white
Odor: Slight amine odor
Melting Point: 250–260°C (decomposes)
Boiling Point: Not available (decomposes before boiling)
Solubility: Soluble in water, slightly soluble in ethanol
Density: 1.5–1.6 g/cm³
pH (1% solution): 2–3
Vapor Pressure: Negligible at ambient temperature
Flash Point: Not applicable (non-volatile solid)
Partition Coefficient (log Kow): Not determined
Auto-Ignition Temperature: Not determined
Chemical Stability: Stable under recommended storage conditions
Conditions to Avoid: Elevated temperatures, moisture, exposure to sunlight, incompatible materials
Incompatible Materials: Strong oxidizing agents, strong acids, strong bases
Hazardous Decomposition Products: Toxic fumes such as nitrogen oxides, sulfur oxides, carbon monoxide, and carbon dioxide may form on burning/decomposition
Possibility of Hazardous Reactions: No hazardous polymerization known
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Harmful if swallowed, inhaled or in contact with skin
Irritation: Causes skin and eye irritation
Chronic Effects: Prolonged exposure may result in adverse effects on liver or kidneys
Sensitization: May cause allergic skin reaction in sensitive individuals
Carcinogenicity: No component listed as carcinogenic per IARC, NTP, or OSHA
Mutagenicity: No data indicating mutagenic effects
Reproductive Toxicity: Not classified as toxic for reproduction
Toxicity to Aquatic Life: Harmful to aquatic organisms, may cause long-term adverse effects in aquatic environment
Persistence and Degradability: Not readily biodegradable
Bioaccumulative Potential: Low potential for bioaccumulation
Mobility in Soil: Moderate mobility, can leach to ground water if large quantities are spilled
Other Adverse Effects: Avoid uncontrolled release into the environment, material may impact pH of water and soil
Disposal Methods: Dispose of contents/containers through licensed chemical waste disposal contractor in accordance with local, regional, national, and international regulations
Waste Codes: Assign as per local hazardous waste regulations
Contaminated Packaging: Dispose of as unused product after decontamination
Precautions for Disposal: Prevent release into sewers, surface waters, or groundwater, keep out of municipal waste streams
UN Number: Not regulated under UN transport system for most forms
Proper Shipping Name: Organic solid, n.o.s. (contains 4-B Acid)
Transport Hazard Class: Not classified as hazardous for transport
Packing Group: None assigned
Environmental Hazards: May pose risk to aquatic environment if spillage occurs
Special Precautions for User: Single-use personal protective equipment recommended during transport spill cleanup
Transport in Bulk (IMDG/IMO): Compliance with MARPOL and IBC regulations
International Inventories: Listed on TSCA (US), EINECS/ELINCS (EU), DSL (Canada), AICS (Australia), IECSC (China), ENCS (Japan)
OSHA Hazard Communication Status: Classified as hazardous
SARA Title III (Sections 311/312): Acute health hazard
RCRA Status: Subject to regulation if discarded as waste
REACH Status: Registered and pre-registered substance in the EU
Other Regulations: Complies with hazard communication standards of most major jurisdictions
Labeling Requirements: Container labels should display product name, hazards, and safe handling instructions
