International Chemical Safety Cards OXALIC ACID DIHYDRATE ICSC: 0707 Ethanedioic acid dihydrate Dicarbolic acid dihydrate C2H2O4•2H2O / HOOCCOOH•2H2O Molecular mass: 126.1 ICSC #    0707 CAS #     6153-56-6 RTECS # RO2450000 EC #         607-006-00-8 December 03, 1990 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. NO open flames. Water spray, powder. EXPLOSION EXPOSURE STRICT HYGIENE!  •INHALATION Cough. Headache. Shortness of breath. Sore throat. Ventilation (not if powder), local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Corrosive. Redness. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower.  •EYES Corrosive. Redness. Pain. Blurred vision. Severe deep burns. Safety spectacles, or face shield. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Corrosive. Abdominal cramps. Burning sensation. Headache. Nausea. Vomiting. (Further see Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into containers. Wash away remainder with plenty of water. (Extra personal protection: P2 filter respirator for harmful particles). Separated from strong oxidants, strong bases. Xn symbol R: 21/22 S: 2-24/25 SEE IMPORTANT INFORMATION ON BACK ICSC: 0707 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 OXALIC ACID DIHYDRATE ICSC: 0707 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS CRYSTALS PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on rapid heating at ca. 150 C, producing toxic and corrosive fumes. The substance is a medium strong acid which reacts vigorously with strong bases. Reacts violently with oxidants causing fire and explosion hazard. Reacts with silver, forming explosive products. OCCUPATIONAL EXPOSURE LIMITS: TLV: 1 mg/m3; STEL: 2 mg/m3 (ACGIH 1997-1998). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. INHALATION RISK: A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C, on dispersing however much faster. EFFECTS OF SHORT-TERM EXPOSURE: The aerosol is corrosive to the eyes and the skin. Exposure could cause anorexia, salivation and nasal discharge with progressive weakness, respiratory distress and collapse. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The substance may have effects on the renal, cardiac, thyroid and nervous tissues , resulting in organ disturbances. PHYSICAL PROPERTIES Sublimation point: see Notes Melting point: 102°C Density: 1.7 g/cm3 Solubility in water, g/100 ml: 10 Vapour pressure, Pa at 30°C: see Notes Relative vapour density (air = 1): 3.1 Octanol/water partition coefficient as log Pow: -0.7 (calculated) ENVIRONMENTAL DATA N O T E S The apparent melting point caused by loss of crystal water is given. The anhydrous form of oxalic acid has a sublimation point of 157°C, while melting takes place at 187°C under decomposition after rapid heating. The recommendations on this Card also apply to the anhydrous form of oxalic acid. NFPA Code: H3; F1; R0; ADDITIONAL INFORMATION ICSC: 0707 OXALIC ACID DIHYDRATE (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.