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Chemical Name and Synonyms: 4-Aminobenzoic acid, p-aminobenzoic acid, PABA
Chemical Family: Amino acid
Chemical Formula: NH2C6H4COOH
Product Use: Laboratory reagent
Manufacturer’s Name and Address:
Caledon Laboratories Ltd.
40 Armstrong Avenue
Georgetown, Ontario L7G 4R9
Telephone No: (905) 877-0101
Fax No: (905) 877-6666
Emergency Telephone No: CANUTEC (613) 996-6666
Ingredients % TLV Units CAS No.
4-Aminobenzoic acid ~99 Not established 150-13-0
Physical State: Solid
Odour and Appearance: White or slightly yellow crystalline powder; odourless.
Odour Threshold (ppm): Not applicable
Vapour Pressure (mm Hg): 0.03 mm Hg @20°C
Vapour Density (Air = 1): Not applicable
Evaporation Rate: Not applicable
Boiling Point (degrees C): Not applicable
Melting Point (degrees C): 188-189°C
pH: 3.5 (0.5% solution)
Specific Gravity: 1.374
Coefficient of Water/Oil distribution: LogP (oct)=0.68
UN: Not regulated
T.D.G. Class: Not regulated
Pkg. Group: Not regulated
Chemical Stability: Normally stable, discolours on exposure to light and air.
Incompatibility with other substances: May react vigorously or violently with ferric salts, oxidizing agents.
Reactivity: Avoid excessive heat, flames, sparks, all incompatible materials, generation of dust. Avoid exposure to light and air.
Hazardous Decomposition Products: COx, nitrogen compoundsFIRE AND EXPLOSION DATA
Flammability: May be combustible if strongly heated. As with most organic compounds, fine dust dispersed in air in the presence of an ignition source is a potential dust explosion hazard.
Extinguishing Media: Water spray, alcohol foam, dry chemical, carbon dioxide. Use water spray or fog to cool containers, disperse dust or vapours, and flush material away from fire. Fight fire from upwind, from a safe distance.
Firefighters must wear protective equipment and clothing sufficient to rpevent inhalation of dust or fumes, and contact with skin and eyes.
Flash Point (Method Used): Not applicable
Autoignition Temperature: Not applicable
Upper Flammable Limit (% by volume): Not applicable
Lower Flammable Limit (% by volume): Not applicable
Hazardous Combustion Products: CO2, nitrogen compounds
Sensitivity to Impact: None identified
Sensitivity to Static discharge: As with most organic powders, mixtures of dust with air may be sensitive under certain conditions, when ignited by an electrostatic or other high-voltage spark, or other ignition source.
Toxicological Data:
LD50: (oral, mouse) 2,850 mg/kg; (oral, rabbit) 1,830 mg/kg
LC50: Not available
Effects of Acute Exposure to Product:
Inhaled: Irritating. May be harmful. Dust or mist can cause irritation of nose, throat and upper respiratory tract, causing coughing, shortness of breath. May cause sensitization.
In contact with skin: Dust may cause irritation, symptoms including redness, itching and pain. Extent of irritation depends on concentration and duration of exposure. May cause skin sensitization.
In contact with eyes: Dust may cause irritation, with redness, itching, tearing, and pain. Extent of irritation depends on concentration and duration of exposure.
Ingested: Harmful in large doses. Ingestion of large doses can cause nausea, skin rash, toxic hepatitis,
methemoglobinemia, with conversion of nitrate to nitrite in the stomach, causing nausea and vomiting, blood and central nervous system effects, weakness, depression, headache, respiratory distress, cyanosis, irregular heart rate, eventual coma and even death.
Effects of Chronic Exposure to Product:
Carcinogenicity: Some evidence of carcinogenicity in animal testing.
Teratogenicity: Some evidence of teratogenicity in animal testing.
Reproductive Effects: Some evidence of reproductive effects in animal testing.
Mutagenicity: Some evidence of mutagenicity in animal testing.
Synergistic Products: None known
Engineering Controls: Local exhaust ventilation required.
Respiratory Protection: Dust mask. NIOSH approved air-supplied respirator or self-contained breathing apparatus for dusty conditions or for high or unknown concentrations, as in fire or spill conditions.
Eye Protection: Chemical safety goggles.
Skin Protection: Rubber or plastic gloves. Plastic apron, sleeves, and other protective clothing sufficient to prevent contact.
Other Personal Protective Equipment: Safety shower and eye-wash fountain in work area.
Leak and Spill Procedure: Eliminate all ignition sources. Cleanup personnel must be thoroughly trained in the hazards of this material and must wear protective equipment and clothing sufficient to prevent inhalation of dust or fumes, and contact with skin and eyes. Prevent from entering sewers or waterways. Mix with sand or inert absorbent, collect in a manner that does not raise dust, and transfer carefully
into labelled, covered container(s) for removal by disposal company. Wash site of spillage thoroughly with water and detergent.
Waste Disposal: Follow all federal, provincial and local regulations for disposal.
Handling Procedures and Equipment: Workers using this chemical must be thoroughly trained in its hazards and its safe use, and must wear appropriate protectiv equipment and clothing. Use the smallest amount possible for the purpose, in designated areas with adequate ventilation. Follow routine safe handling and good housekeeping procedures.
Prevent release of dusts into workplace air. If dust is present, observe explosion prevention measures, use non-sparking tools, keep away from heat, sparks, and all sources of ignition; avoid the accumulation of static charge, ground and bond equipment and containers. Avoid contact with skin and eyes and inhalation of dust. Keep containers closed when not in use and when empty.
Storage Requirements: Store in suitable, labelled containers, in a cool, dry, well-ventilated area, out of direct sunlight. Store away from incompatible materials. Keep containers tightly closed when not in use and when empty. Protect from damage.
Specific Measures:
Eyes: Flush eyes thoroughly with gently running water for five to ten (5-10) minutes, holding eyelids open while flushing. Get medical attention if irritation develops.
Skin: Remove contaminated clothing, including watches, belts, rings, and shoes. Wash skin with plenty of running water for five to ten (5-10) minutes, or until all traces of chemical are gone. If irritation develops get medical attention.
Inhalation: Remove to fresh air. Give oxygen and get medical attention for any breathing difficulty.
Ingestion: Do not induce vomiting. If victim is alert and not convulsing, rinse mouth thoroughly with water and give 2 to4 glasses of water to drink to dilute product. Get medical attention.
Budavari: The Merck Index, 12th ed., 1997
Sax, Lewis: Hawley’s Condensed Chemical Dictionary, 11th ed., 1987
Sax: Dangerous Properties of Industrial Materials, 5th ed., 1979
Suppliers’ Material Safety Data Sheets
Date Issued: May 6, 1991
Revision: September 2007
MSDS: 1180-5
Proposed WHMIS Designation: Insufficient information available
Prepared by: Caledon Laboratories Ltd. (905) 877-0101
Caledon Laboratories Ltd. believes the information contained herein is reliable and accurate. Caledon makes no warranty with respect thereto and expressly disclaims all liability for reliance thereon. Such information is solely for your consideration, investigation, and verification.

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