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Chemical Name: 4-Aminothiophenol Synonyms: p-Aminothiophenol, 4-ATP Chemical Formula: C6H7NS Molecular Weight: 125.19 g/mol Appearance: Pale yellow to tan powder Odor: Characteristic, sulfurous Common Uses: Research laboratories, chemical syntheses, often as a modifier in surface chemistry
Hazard Classification: Harmful if swallowed, skin irritant, serious eye damage, hazardous to aquatic environments Hazard Statements: Causes skin irritation, may cause allergic skin reactions, harmful to eyes and respiratory system, toxic to aquatic life Pictograms: Exclamation mark, environment hazard, corrosion Routes of Exposure: Inhalation, skin contact, ingestion, eye contact Chronic Effects: Possible sensitization following repeated or prolonged exposure
Component: 4-Aminothiophenol Concentration: Typically 98–100% purity in laboratory settings CAS Number: 1193-02-8 Impurities: Minor organic residues from synthesis, often less than 2%
Inhalation: Move person to fresh air, monitor breathing, seek medical advice if symptoms persist Skin Contact: Rinse thoroughly with soap and water; remove contaminated clothing Eye Contact: Rinse cautiously with water for several minutes, seek medical attention if irritation continues Ingestion: Rinse mouth with water, never induce vomiting, consult a physician immediately Symptoms to Watch: Persistent coughing, skin rash, severe eye redness, upset stomach
Suitable Extinguishing Agents: Water spray, foam, dry chemical, carbon dioxide Hazardous Combustion Products: Sulfur oxides, nitrogen oxides, toxic fumes Protective Equipment: Self-contained breathing apparatus, chemical-resistant gear Risks: Dust may form explosive mixtures with air; avoid stirring powders near open flames
Personal Protection: Nitrile gloves, laboratory coat, eye protection, mask to prevent dust inhalation Containment: Collect spilled powder using non-sparking tools; minimize dust generation Clean-up: Sweep up residue, wash area with soap and water, dispose according to regulations Environmental Precautions: Prevent from entering sewers or waterways; notify local authorities if substantial release occurs
Handling Advice: Work in a fume hood, avoid breathing dust or vapors, wash hands after handling Storage Conditions: Keep container tightly closed, store in a cool, dry place, out of direct sunlight Incompatible Materials: Strong oxidizers, strong acids, bases Precautions: Store separate from food and drink, away from incompatible substances
Engineering Controls: Adequate local exhaust ventilation, safety eyewash stations Personal Protective Equipment: Protective gloves (nitrile or neoprene), safety goggles, lab coat, dust mask or respirator if needed Exposure Limits: No established OSHA or NIOSH limits, but minimize exposure as a best practice Hygiene Measures: Wash hands after use, remove contaminated clothing, avoid eating or drinking in work areas
Physical State: Crystalline solid or powder Color: Light yellow to tan Odor: Pungent, sulfur-like Melting Point: Around 130–135°C Boiling Point: Data limited, decomposes before boiling Solubility: Slightly soluble in water, soluble in alcohol and other organic solvents Vapor Pressure: Low at room temperature Flash Point: Not easily flammable, but best to keep away from sources of ignition
Chemical Stability: Stable under normal temperature and pressure, sensitive to prolonged air exposure Reactivity Hazards: Violet when reacting with oxidizing agents; decomposes under strong acid or base conditions Hazardous Reactions: May release toxic gases such as hydrogen sulfide and nitrogen oxides Incompatibilities: Strong oxidizers, acids, bases Decomposition: Prolonged heating or contact with strong chemicals breaks down structure, increasing risk of hazardous byproducts
Acute Toxicity: Harmful if ingested, skin and eye irritant, moderate inhalation hazard POTENTIAL HEALTH EFFECTS: Irritation to skin, eyes, mucous membranes; sensitization—possible allergic reactions Symptoms: Dermatitis, eye burns, coughing, sore throat, nausea Long-Term Effects: Not enough data for carcinogenicity, chronic respiratory or dermal exposure can cause sensitization or persistent irritation
Aquatic Toxicity: Toxic to aquatic life, particularly in concentrated spills Persistence and Degradability: Resists natural breakdown; remains in aquatic systems without proper treatment Bioaccumulation: Data lacking but potential for concentration in aquatic organisms Mobility: Moderate mobility, especially in water, risk of spreading if improperly disposed
Waste Handling: Place in sealed, clearly labeled containers Disposal Methods: Chemical incineration in accordance with national and local regulations Special Considerations: Do not release into drains or environment; professional waste handler or disposal company recommended Regulatory Requirements: Follow hazardous waste guidelines established for your area
Shipping Classification: Hazardous for ground and air transport due to toxicity and environmental hazard UN Number: Not assigned universally; handle as hazardous laboratory chemical Packing Requirements: Leak-proof, clearly labeled, follow local and international regulations for chemical shipment Precautions: Keep sealed, upright, away from incompatible chemicals during transport
Labelling Requirements: Corrosive and harmful—warning labels needed under GHS International Listings: Listed by many chemical authorities as hazardous and toxic Regulatory Restrictions: May face use and disposal limitations under regional environmental and workplace laws Worker Protection: Compliance with OSHA laboratory standard, Chemical Hygiene Plan requirements
