International Chemical Safety Cards DIBORANE ICSC: 0432 Boroethane Boron hydride Diboron hexahydride B2H6/BH3BH3 Molecular mass: 27.7 (cylinder) (liquefied, cooled) ICSC #    0432 CAS #     19287-45-7 RTECS # HQ9275000 UN #        1911 April 07, 2006 Validated TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Extremely flammable. NO open flames, NO sparks, and NO smoking. NO contact with halogens, oxidants or water. NO contact with hot surfaces. Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with Dry powder. NO hydrous agents. EXPLOSION Gas/air mixtures are explosive. Risk of explosion on contact with water Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools. In case of fire: cool cylinder by spraying with water but avoid contact of the substance with water. Combat fire from a sheltered position. Fire fighters should wear complete protective clothing including self-contained breathing apparatus. EXPOSURE STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Cough. Sore throat. Nausea. Laboured breathing. Dizziness. Weakness. Headache. Fever or elevated body temperature. Tremor. Symptoms may be delayed (see Notes). Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention.  •SKIN Serious frostbite. Cold-insulating gloves. ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.  •EYES Severe deep burns. Safety goggles 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 Do not eat, drink, or smoke during work. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Remove all ignition sources. Stop flow of gas. Ventilation. Fireproof. Separated from strong oxidants, food and feedstuffs and water Cool. Ventilation along the floor and ceiling. dry Special insulated cylinder. Do not transport with food and feedstuffs. UN Hazard Class: 2.3 UN Subsidiary Risks: 2.1 Signal: Danger Flame-Cylinder-Skull-Corr-Health haz Extremely flammable gas Contains gas under pressure; may explode if heated Fatal if inhaled gas Causes severe skin burns and eye damage Causes damage to respiratory system if inhaled SEE IMPORTANT INFORMATION ON BACK ICSC: 0432 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 DIBORANE ICSC: 0432 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS COMPRESSED GAS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: The gas mixes well with air, explosive mixtures are easily formed. CHEMICAL DANGERS: The substance will polymerize to form liquid pentaborane. Reacts violently with oxidants. The substance decomposes rapidly on heating producing hydrogen, boric acid and boric oxide OCCUPATIONAL EXPOSURE LIMITS: TLV: 0.1 ppm; 0.1 mg/m³ (ACGIH 2006). MAK: IIb (not established but data is available)(DFG 2005). OSHA PEL: TWA 0.1 ppm (0.1 mg/m3) NIOSH REL: TWA 0.1 ppm (0.1 mg/m3) NIOSH IDLH: 15 ppm See: 19287457 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation. Serious local effects on contact with skin . INHALATION RISK: On loss of containment, a harmful concentration of this gas in the air will be reached very quickly. EFFECTS OF SHORT-TERM EXPOSURE: The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of this substance may cause lung oedema (see Notes). The effects may be delayed. Exposure may result in death. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Inhalation may cause asthma-like reactions (RADS). PHYSICAL PROPERTIES Boiling point: -92°C Melting point: -165°C Solubility in water: hydrolyzes to hydrogen and boric acid Vapour pressure, kPa at 25°C: 3.7 Relative vapour density (air = 1): 0.96 Flash point: flammable gas Auto-ignition temperature: (see Notes) 40-50°C Explosive limits, vol% in air: 0.8-88 ENVIRONMENTAL DATA N O T E S The presence of contaminants may lower the auto-ignition temperature so that ignition may occur at or below room temperature. Reacts violently with fire extinguishing agents such as water. Environmental effects from the substance have not been investigated. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation is therefore essential. The odour warning when the exposure limit value is exceeded is insufficient. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Transport Emergency Card: TEC (R)-20S1911 NFPA Code: H4; F4; R4; W ADDITIONAL INFORMATION ICSC: 0432 DIBORANE (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.