International Chemical Safety Cards
HEXAMETHYLENE DIISOCYANATE
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ICSC: 0278
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PHYSICAL STATE; APPEARANCE:
CLEAR, COLOURLESS LIQUID
, WITH PUNGENT ODOUR.
PHYSICAL DANGERS:
CHEMICAL DANGERS:
The substance will polymerize
under the influence of temperatures above 93°C.
On combustion, forms toxic and corrosive fumes including nitrogen oxides and hydrogen cyanide (see ICSC # 0492).
The substance decomposes
on contact with water to form amine and polyureas.
Reacts violently with acids, alcohols, amines, bases and oxidants
causing fire and explosion hazard.
Attacks copper.
OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV: 0.005 ppm; 0.035 mg/m3 as TWA (ACGIH 1992-1993).
OSHA PEL: none
NIOSH REL: TWA 0.005 ppm (0.035 mg/m3) C 0.020 ppm (0.140 mg/m3) 10-minute
NIOSH IDLH: No data
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ROUTES OF EXPOSURE:
The substance can be absorbed into the body
by inhalation of its vapour,
by inhalation of its aerosol and
through the skin.
INHALATION RISK:
A harmful contamination of the air will be reached rather slowly 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,
the skin and
the respiratory tract.
Exposure far above the TLV may result in respiratory sensitization.
EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact may cause skin sensitization.
Repeated or prolonged inhalation exposure may cause asthma (see Notes).
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PHYSICAL PROPERTIES
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Boiling point: 255°C
Melting point: -67°C
Relative density (water = 1): 1.05
Solubility in water: Reacts
Vapour pressure, Pa at 25°C: 7
Relative vapour density (air = 1): 5.8
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Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00
Flash point: 140°C o.c.
Auto-ignition temperature: 454°C
Explosive limits, vol% in air: 0.9-9.5
Octanol/water partition coefficient as log Pow: 1.08
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ENVIRONMENTAL DATA
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N O T E S
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Immediate administration of an appropriate spray, 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.
Anyone who has shown symptoms of asthma due to this substance should avoid all further contact with this substance.
Workers exposed to this compound may be sensitized to other isocyanates (asthma).
The odour warning when the exposure limit value is exceeded is insufficient.
Do NOT take working clothes home.
Desmodur H and Desmodur N are trade names.
Transport Emergency Card: TEC (R)-61G06b
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ADDITIONAL INFORMATION
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ICSC: 0278
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HEXAMETHYLENE DIISOCYANATE
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© IPCS, CEC, 1993
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