International Chemical Safety Cards BENZENESULFONIC ACID ICSC: 1626 Benzenemonosulfonic acid Phenylsulfonic acid C6H6O3S Molecular mass: 158.2 ICSC #    1626 CAS #     98-11-3 RTECS # DB4200000 UN #        2585 October 18, 2005 Validated TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames. Powder, alcohol-resistant foam, water in large amounts, carbon dioxide. EXPLOSION EXPOSURE STRICT HYGIENE!  •INHALATION Cough. Sore throat. Shortness of breath. Laboured breathing. Burning sensation. Headache. Nausea. Ventilation (not if powder), local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.  •SKIN Redness. Burning sensation. Pain. Skin burns. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •EYES Redness. Pain. Severe deep burns. Face shield and eye protection in combination with breathing protection. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Sore throat. Burning sensation in the throat and chest. Abdominal pain. Shock or collapse. Do not eat, drink, or smoke during work. Rinse mouth. Give plenty of water to drink. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Personal protection: P2 filter respirator for harmful particles. Use face shield. Chemical protection suit. Sweep spilled substance into plastic containers. Wash away remainder with plenty of water. Separated from oxidants , bases , metals , food and feedstuffs Dry. Well closed. Ventilation along the floor. Do not transport with food and feedstuffs. UN Hazard Class: 8 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1626 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards BENZENESULFONIC ACID ICSC: 1626 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: GREY TO YELLOW HYGROSCOPIC CRYSTALS OR FLAKES , WITH PUNGENT ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic and corrosive fumes . The solution in water is a strong acid, it reacts violently with bases and is corrosive. Reacts violently with oxidants . Attacks many metals forming flammable/explosive gas (hydrogen - see ICSC 0001). OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and by ingestion. INHALATION RISK: A harmful concentration of airborne particles can be reached quickly on spraying. EFFECTS OF SHORT-TERM EXPOSURE: The substance is corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 190°C Melting point: 51°C Relative density (water = 1): 1.3 (at 47°C) Solubility in water, g/100 ml at 20°C: 93 Relative vapour density (air = 1): 5.5 Flash point: 113°C Octanol/water partition coefficient as log Pow: -1.2 ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-80GC4-II+III ADDITIONAL INFORMATION ICSC: 1626 BENZENESULFONIC ACID (C) IPCS, CEC, 1994

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.