International Chemical Safety Cards 1,3-PROPANE SULTONE ICSC: 1524 1,2-Oxathiolane-2,2-dioxide 3-Hydroxy-1-propanesulphonic acid sultone 1-Propanesulfonic acid, 3-hydroxy-gamma-sultone C3H6O3S Molecular mass: 122.1 ICSC #    1524 CAS #     1120-71-4 RTECS # RP5425000 UN #        2811 EC #         016-032-00-3 April 20, 2004 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Gives off irritating or toxic fumes (or gases) in a fire. In case of fire in the surroundings: use appropriate extinguishing media. EXPLOSION EXPOSURE AVOID ALL CONTACT!  •INHALATION Cough. Closed system. Fresh air, rest.  •SKIN MAY BE ABSORBED! Redness. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.  •EYES Redness. Face shield, or 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 See EFFECTS OF LONG-TERM OR REPEATED EXPOSURE. Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Chemical protection suit including self-contained breathing apparatus. Vacuum spilled material OR sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Separated from food and feedstuffs . Store in an area without drain or sewer access. Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs. Note: E T symbol R: 45-21/22 S: 53-45 UN Hazard Class: 6.1 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1524 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 1,3-PROPANE SULTONE ICSC: 1524 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE CRYSTALS OR COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic fumes including sulfur oxides . Reacts with moist air to produce toxic 3-propane sulfonic acid. OCCUPATIONAL EXPOSURE LIMITS: TLV: L as TWA; A3; (ACGIH 2004). See Notes. MAK: H; Carcinogen category: 2; (DFG 2003). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation, through the skin and by ingestion. INHALATION RISK: A harmful concentration of airborne particles can be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: The substance is mildly irritating to the eyes and the skin . EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: This substance is possibly carcinogenic to humans. PHYSICAL PROPERTIES Decomposes below boiling point Melting point: 31°C Relative density (water = 1): 1.393 (at 40°C) Solubility in water, g/100 ml: 10 ENVIRONMENTAL DATA N O T E S Depending on the degree of exposure, periodic medical examination is suggested. Do NOT take working clothes home. TLV: Exposure by all routes should be carefully controlled to level as low as possible. Transport Emergency Card: TEC (R)-61GT2-III ADDITIONAL INFORMATION ICSC: 1524 1,3-PROPANE SULTONE (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.