International Chemical Safety Cards 4-METHOXYPHENOL ICSC: 1097 Hydroquinone monomethyl ether Mequinol p-Hydroxyanisole C7H8O2 / OH(C6H4)OCH3 Molecular mass: 124.1 ICSC #    1097 CAS #     150-76-5 RTECS # SL7700000 EC #         604-044-00-7 October 25, 2004 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. NO open flames. Powder, alcohol-resistant foam, water spray, carbon dioxide. EXPLOSION Finely dispersed particles form explosive mixtures in air. Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting. EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Local exhaust or breathing protection. Fresh air, rest.  •SKIN Redness. Burning sensation. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap.  •EYES Redness. Pain. Safety goggles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Do not eat, drink, or smoke during work. Rinse mouth. Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into sealable containers. Carefully collect remainder, then remove to safe place. Personal protection: P2 filter respirator for harmful particles. Separated from strong oxidants, strong bases, acid anhydrides , acid chlorides . Xn symbol R: 22-36-43 S: 2-24/25-26-37/39-46 SEE IMPORTANT INFORMATION ON BACK ICSC: 1097 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 4-METHOXYPHENOL ICSC: 1097 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE TO TAN SOLID IN VARIOUS FORMS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: Dust explosion possible if in powder or granular form, mixed with air. CHEMICAL DANGERS: Reacts with strong oxidants , strong bases , acid anhydrides and acid chlorides . The solution in water is a weak acid. OCCUPATIONAL EXPOSURE LIMITS: TLV: 5 mg/m³ as TWA (ACGIH 2004). MAK not established. NIOSH REL: TWA 5 mg/m3 NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by ingestion. INHALATION RISK: A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance is irritating to the eyes and the skin . EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the skin , resulting in depigmentation. PHYSICAL PROPERTIES Boiling point: 243°C Melting point: 57°C Density: 1.6 g/cm3 Solubility in water, g/100 ml at 25°C: 4 Relative vapour density (air = 1): 4.3 Flash point: 132°C o.c. Auto-ignition temperature: 421°C Octanol/water partition coefficient as log Pow: 1.58 Octanol/water partition coefficient as log Pow: 1.34 ENVIRONMENTAL DATA N O T E S Do NOT take working clothes home. NFPA Code: H2; F1; R0; ADDITIONAL INFORMATION ICSC: 1097 4-METHOXYPHENOL (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.