International Chemical Safety Cards POTASSIUM DICHROMATE ICSC: 1371 Dipotassium dichromate (VI) Dichromic acid, dipotassium salt Potassium bichromate K2Cr2O7 Molecular mass: 294.2 ICSC #    1371 CAS #     7778-50-9 RTECS # HX7680000 UN #        3288 EC #         024-002-00-6 April 19, 2005 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible but enhances combustion of other substances. NO contact with flammable substances. In case of fire in the surroundings: water in large amounts. EXPLOSION Risk of fire and explosion on contact with combustible substances. EXPOSURE PREVENT DISPERSION OF DUST! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Burning sensation. Sore throat. Cough. Wheezing. Laboured breathing. Closed system and ventilation. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.  •SKIN Redness. Pain. Skin burns. Protective gloves. Protective clothing. First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention.  •EYES Redness. Pain. Blurred vision. 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 Nausea. Vomiting. Abdominal pain. Burning sensation. Diarrhoea. Shock or collapse. Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Personal protection: complete protective clothing including self-contained breathing apparatus. Sweep spilled substance into non-combustible 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. Separated from combustible and reducing substances, food and feedstuffs. Store in an area without drain or sewer access. Do not transport with food and feedstuffs. Note: E, 3 T+ symbol N symbol O symbol R: 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53 S: 53-45-60-61 UN Hazard Class: 6.1 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1371 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 POTASSIUM DICHROMATE ICSC: 1371 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: ORANGE TO RED CRYSTALS . PHYSICAL DANGERS: CHEMICAL DANGERS: The substance is a strong oxidant and reacts with combustible and reducing materials. The solution in water is a weak acid. OCCUPATIONAL EXPOSURE LIMITS: TLV: (as Cr) 0.05 mg/m³ as TWA; A1 (confirmed human carcinogen); BEI issued; (ACGIH 2005). MAK: (Inhalable fraction); sensitization of skin (Sh); Carcinogen category: 2; (DFG 2004). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. INHALATION RISK: A harmful concentration of airborne particles can be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: The substance is corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion. The substance may cause effects on the kidneys and liver , resulting in tissue lesions. 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 respiratory tract and kidneys , resulting in nasal septum perforation and kidney impairment . This substance is carcinogenic to humans. May cause heritable genetic damage to human germ cells. Animal tests show that this substance possibly causes toxicity to human reproduction or development. PHYSICAL PROPERTIES Decomposes below boiling point at 500°C Melting point: 398°C Density: 2.7 g/cm³ Solubility in water, g/100 ml at 20°C: 12 ENVIRONMENTAL DATA The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. N O T E S Rinse contaminated clothes (fire hazard) with plenty of water. Do NOT take working clothes home. Anyone who has shown symptoms of asthma due to this substance should avoid all further contact. 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. Transport Emergency Card: TEC (R)-61GT5-III ADDITIONAL INFORMATION ICSC: 1371 POTASSIUM DICHROMATE (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.