International Chemical Safety Cards tert-BUTYL HYDROPEROXIDE (70 % AQUEOUS SOLUTION) ICSC: 0842 1,1-Dimethylethylhydroxiperoxide 2-Hydroperoxy-2-methylpropane C4H10O2 / (CH3)3COOH Molecular mass: 90.1 ICSC #    0842 CAS #     75-91-2 RTECS # EQ4900000 UN #        3109 October 20, 1999 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. Many reactions may cause fire or explosion. NO open flames, NO sparks, and NO smoking. NO contact with flammable substances. Dry sand, powder, alcohol-resistant foam, water spray, carbon dioxide. EXPLOSION Above 43°C explosive vapour/air mixtures may be formed. Risk of fire and explosion when heated. Above 43°C use a closed system, ventilation, and explosion-proof electrical equipment. In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. EXPOSURE PREVENT GENERATION OF MISTS!  •INHALATION Burning sensation. Cough. Laboured breathing. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Pain. Redness. Blisters. 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, 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 Abdominal cramps. Burning sensation. Weakness. Do not eat, drink, or smoke during work. Rinse mouth. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT absorb in saw-dust or other combustible absorbents. (Extra personal protection: chemical protection suit including self-contained breathing apparatus). Fireproof. Separated from combustible and reducing substances. Cool. Inspect frequently to identify bulging and leaking. R: S: UN Hazard Class: 5.2 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0842 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 tert-BUTYL HYDROPEROXIDE (70 % AQUEOUS SOLUTION) ICSC: 0842 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH PUNGENT ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: May explode on heating. The substance is a strong oxidant and reacts violently with combustible and reducing materials metallic and sulphur compounds. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation, through the skin by ingestion. INHALATION RISK: No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance is corrosive to the eyes, the skin and the respiratory tract. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point (decomposes): 89°C Melting point: -3°C Relative density (water = 1): 0.93 Solubility in water: miscible Vapour pressure, kPa at 20°C: 3.07 calculated Relative vapour density (air = 1): 3.1 Flash point: 43°C Auto-ignition temperature: 238°C Explosive limits, vol% in air: 5-10 Octanol/water partition coefficient as log Pow: -1.3 (calculated) ENVIRONMENTAL DATA N O T E S Rinse contaminated clothes (fire hazard) with plenty of water. UN number (for solvents other than water): 3105. TBHP-70 and Trigonox A-75 are trade names. Transport Emergency Card: TEC (R)-839 NFPA Code: H1; F4; R4; ox ADDITIONAL INFORMATION ICSC: 0842 tert-BUTYL HYDROPEROXIDE (70 % AQUEOUS SOLUTION) (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.