Physical State; Appearance
BLUISH BLACK OR DARK PURPLE CRYSTALS WITH PUNGENT ODOUR.
The substance readily sublimes.
Upon heating, toxic fumes are formed. Decomposes on heating. This produces toxic fumes. The substance is a strong oxidant. It reacts with combustible and reducing materials. Reacts violently with metal powders, antimony, ammonia, acetaldehyde and acetylene. This generates fire and explosion hazard.
Occupational exposure limits
TLV (inhalable fraction and vapour). 0.01 ppm as TWA; (ACGIH 2004) .
TLV (vapour). 0.1 ppm as STEL; A4 (not classifiable as a human carcinogen); (ACGIH 2008) .
MAK (2b (not established but data is available)). (DFG 2009).
Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion.
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C.
Effects of short-term exposure
Lachrymation. The substance is severely irritating to the eyes and respiratory tract. The substance is irritating to the skin. Inhalation of the vapour may cause asthma-like reactions (RADS). Inhalation of of the vapour may cause lung oedema. See Notes. The effects may be delayed. Medical observation is indicated.
Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization in rare cases. Repeated or prolonged inhalation may cause asthma-like syndrome (RADS). The substance may have effects on the thyroid.
Boiling point: 184 °C
Melting point: 114 °C
Relative density (water = 1): 4.9
Solubility in water, g/100ml at 20°C. 0.03
Vapour pressure, kPa at 25 °C: 0.04
Relative vapour density (air = 1): 8.8
Relative density of the vapour/air-mixture at 20 °C (air = 1): 1
Octanol/water partition coefficient as log Pow: 2.49
This substance may be hazardous to the environment. Special attention should be given to fish.
The occupational exposure limit value should not be exceeded during any part of the working exposure.
Rinse contaminated clothes (fire hazard) with plenty of water.
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.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
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.
Card has been partially updated in October 2005: see Emergency Response;
Card has been partially updated in August 2008: see Ingestion First Aid;