International Chemical Safety Cards SODIUM HYDROXIDE ICSC: 0360 SODIUM HYDROXIDE Caustic soda Sodium hydrate Soda lye NaOH Molecular mass: 40.0 CAS # 1310-73-2 RTECS # WB4900000 ICSC # 0360 UN # 1823 EC # 011-002-00-6 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible. Contact with moisture or water may generate sufficient heat to ignite combustible substances (see Notes). In case of fire in the surroundings: all extinguishing agents allowed. EXPLOSION   EXPOSURE PREVENT DISPERSION OF DUST! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! INHALATION Corrosive. Burning sensation. Cough. Laboured breathing. Local exhaust or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention. SKIN Corrosive. Redness. Serious skin burns. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention. EYES Corrosive. Redness. Pain. Blurred vision. Severe deep burns. Face shield or eye protection in combination with breathing protection if powder. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor. INGESTION Corrosive. Abdominal pain. Burning sensation. Collapse. 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 suitable containers. Wash away remainder with plenty of water (extra personal protection: complete protective clothing including self-contained breathing apparatus). Separated from strong acids, metals, food and feedstuffs, combustible materials. Dry. Well closed (see Notes). Do not transport with food and feedstuffs. C symbol R: 35 S: 2-26-37/39 UN Hazard Class: 8 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0360 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards SODIUM HYDROXIDE ICSC: 0360 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE, DELIQUESCENT SOLID IN VARIOUS FORMS WITH NO ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance is a strong base, it reacts violently with acid and is corrosive in moist air to metals like zinc, aluminum, tin and lead forming a combustible/explosive gas (hydrogen) - see ICSC 0001). Attacks some forms of plastics, rubber or coatings. Rapidly absorbs carbon dioxide and water from air. Contact with moisture or water may generate heat. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: ppm; 2 mg/m3 (ceiling values) (ACGIH 1993-1994). PDK not established. MAK: ppm; 2 mg/m3; I (1992). MAK: class G (1992). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly. EFFECTS OF SHORT-TERM EXPOSURE: Corrosive. The substance is very corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion. Inhalation of an aerosol of the substance may cause lung oedema (see Notes). EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. PHYSICAL PROPERTIES Boiling point: 1390°C Melting point: 318°C Relative density (water = 1): 2.1 Solubility in water, g/100 ml at 20°C: 109 Vapour pressure, kPa at 739°C: 0.13

ENVIRONMENTAL DATA	This substance may be hazardous to the environment; special attention should be given to water organisms.
NOTES
The applying occupational exposure limit value should not be exceeded during any part of the working exposure. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water. Store in an area having corrosion resistant concrete floor. Transport Emergency Card: TEC (R)-121 NFPA Code: H 3; F 0; R 1;

ADDITIONAL INFORMATION
ICSC: 0360 SODIUM HYDROXIDE © IPCS, CEC, 1993

IMPORTANT LEGAL NOTICE: Neither the CEC or the IPCS nor any person acting on behalf of 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.