International Chemical Safety Cards p-PHENYLENEDIAMINE ICSC: 0805 p-PHENYLENEDIAMINE 1,4-Diaminobenzene 1,4-Benzenediamine p-Aminoaniline C6H8N2/C6H4(NH2)2 Molecular mass: 108.2 CAS # 106-50-3 RTECS # SS8050000 ICSC # 0805 UN # 1673 EC # 612-028-00-6 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames. Water spray, powder. EXPLOSION Finely dispersed particles form explosive mixtures in air. Risk of fire and explosion on contact with strong oxidizers. Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting. EXPOSURE STRICT HYGIENE! INHALATION Cough. Dizziness. Headache. Laboured breathing. (see Ingestion). Local exhaust or breathing protection. Fresh air, rest. Half-upright position. Refer for medical attention. SKIN MAY BE ABSORBED! Redness. Protective gloves. Protective clothing. First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention. EYES Redness. Pain. Swelling of the eyelids. Blurred vision. Even permanent loss of vision. Safety spectacles, 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 pain. Blue lips or fingernails. Blue skin. Convulsions. Drowsiness. Laboured breathing. Shortness of breath. Vomiting. Weakness. Do not eat, drink, or smoke during work. Rinse mouth. Give a slurry of activated charcoal in water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Do NOT absorb in saw-dust or other combustible absorbents. Do NOT let this chemical enter the environment. (extra personal protection: P3 filter respirator for toxic particles). Separated from strong oxidants, strong acids, acid anhydrides, food and feedstuffs. Keep in the dark. Well closed. Airtight. Do not transport with food and feedstuffs. T symbol N symbol R: 23/24/25-43-50/53 S: (1/2-)28-36/37-45-60/61 Note: C UN Hazard Class: 6.1 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 0805 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

International Chemical Safety Cards p-PHENYLENEDIAMINE ICSC: 0805 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE TO SLIGHTLY RED CRYSTALS, TURNS DARK ON EXPOSURE TO AIR. PHYSICAL DANGERS: Dust explosion possible if in powder or granular form, mixed with air. CHEMICAL DANGERS: The substance decomposes on burning producing toxic fumes (nitrogen oxides). The substance is a strong reducing agent and reacts violently with oxidants and strong bases. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: 0.1 mg/m3 A4 (as TWA) (ACGIH 1997). MAK: 0.1 mg/m3; H, S, IIIB (1996) OSHA PEL: TWA 0.1 mg/m3 skin NIOSH REL: TWA 0.1 mg/m3 skin NIOSH IDLH: 25 mg/m3 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation through the skin and 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; on spraying or dispersing, however, much faster. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes. Inhalation of dust may cause asthmatic reactions (see Notes). Swelling of mouth and throat may be observed following ingestion. The substance may cause effects on the blood , resulting in formation of methaemoglobin. Exposure may result in death. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation exposure may cause asthma. The substance may have effects on the kidneys , resulting in kidney impairment. PHYSICAL PROPERTIES Boiling point: 267°C Melting point: 139-147°C Relative density (water = 1): 1.1 Solubility in water, g/100 ml at 25°C: 4 Vapour pressure, Pa at 100°C: 144 Relative vapour density (air = 1): 3.7 Flash point: 156°C c.c. Auto-ignition temperature: 400°C Explosive limits, vol% in air: 1.5-? ENVIRONMENTAL DATA The substance is very toxic to aquatic organisms. N O T E S Depending on the degree of exposure, periodic medical examination is indicated. The symptoms of asthma 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. Anyone who has shown symptoms of asthma due to this substance should avoid all further contact with this substance. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. The relation between odour and the occupational exposure limit cannot be indicated. Rinse contaminated clothes (fire hazard) with plenty of water. Benzofur D, Developer PF, Fourine D, Pelagon D, Orsin, Ursol-D and Vulkanox 4020 are trade names. Transport Emergency Card: TEC (R)-61G12b ADDITIONAL INFORMATION ICSC: 0805 p-PHENYLENEDIAMINE © IPCS, CEC, 1993

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 IDLH values.