International Chemical Safety Cards TETRAETHYL SILICATE ICSC: 0333 Tetraethoxysilane Ethyl silicate Tetraethyl orthosilicate (C2H5O)4Si Molecular mass: 208.3 ICSC #    0333 CAS #     78-10-4 RTECS # VV9450000 UN #        1292 EC #         014-005-00-0 March 25, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. NO open flames, NO sparks, and NO smoking. Water spray, foam, alcohol-resistant foam. EXPLOSION Above 37°C explosive vapour/air mixtures may be formed. Above 37°C use a closed system, ventilation, and explosion-proof electrical equipment. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE  •INHALATION Cough. Dizziness. Headache. Sore throat. Ventilation, local exhaust, or breathing protection. Fresh air, rest.  •SKIN Dry skin. Redness. Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower.  •EYES Redness. Pain. Safety spectacles, 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 Confusion. Vomiting. (Further see Inhalation). Rinse mouth. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Ventilation. Remove all ignition sources. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Note: Reacts with water to form an adhesive mass. (Extra personal protection: complete protective clothing including self-contained breathing apparatus). Fireproof. Separated from acids, oxidants. Cool. Dry. Keep in a well-ventilated room. Xn symbol R: 10-20-36/37 S: 2 UN Hazard Class: 3 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 0333 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 TETRAETHYL SILICATE ICSC: 0333 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: Reacts with acids, water and oxidants. OCCUPATIONAL EXPOSURE LIMITS: TLV: 10 ppm; 85 mg/m3 (as TWA) (ACGIH 1996). MAK: 20 ppm; 170 mg/m3; (1996) OSHA PEL: TWA 100 ppm (850 mg/m3) NIOSH REL: TWA 10 ppm (85 mg/m3) NIOSH IDLH: 700 ppm ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its vapour and by ingestion. INHALATION RISK: A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes, the skin and the respiratory tract. Exposure could cause lowering of consciousness. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The liquid defats the skin. The substance may have effects on the kidneys . PHYSICAL PROPERTIES Boiling point: 168°C Melting point: -77°C Relative density (water = 1): 0.93 Solubility in water: slowly hydrolyzes Vapour pressure, Pa at 20°C: 200 Relative vapour density (air = 1): 7.22 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01 Flash point: 37°C c.c. Explosive limits, vol% in air: 1.3-23 ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-556 NFPA Code: H2; F2; R2; ADDITIONAL INFORMATION ICSC: 0333 TETRAETHYL SILICATE (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.