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ISOBUTYL CHLOROFORMATEICSC: 1594
Isobutyl chlorocarbonate
2-Methylpropyl chloroformate
Formic acid, chloro-, isobutyl ester
Carbonochloridic acid, 2-methylpropyl ester
October 2005
CAS #: 543-27-1
UN #: 2742
EC Number: 208-840-1

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Above 27°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking.  Above 27°C use a closed system, ventilation and explosion-proof electrical equipment.  NO water. Use dry powder, carbon dioxide, alcohol-resistant foam.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 

 STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS PREVENTION FIRST AID
Inhalation Sore throat. Burning sensation. Cough. Laboured breathing. Shortness of breath. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Redness. Pain. Skin burns.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain. Severe deep burns.  Wear 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 refer for medical attention. 
Ingestion Abdominal pain. Burning sensation. Shock or collapse.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Collect leaking and spilled liquid in sealable dry plastic containers as far as possible. Absorb remaining liquid in dry sand or inert absorbent. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Subsidiary Risks: 3 and 8; UN Pack Group: II 

STORAGE
Fireproof. Dry. Well closed. Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Store in an area without drain or sewer access. 
PACKAGING
Do not transport with food and feedstuffs.
Unbreakable packaging.
Put breakable packaging into closed unbreakable container. 
ISOBUTYL CHLOROFORMATE ICSC: 1594
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
 

Chemical dangers
Decomposes on burning. This produces toxic and corrosive fumes. Reacts with water and moisture. This produces hydrogen chloride. 

Formula: C5H9ClO2 / (CH3)2CHCH2OCOCl
Molecular mass: 136.6
Boiling point: 129°C
Density: 1.04 g/cm³
Solubility in water: reaction
Vapour pressure, kPa at 20°C: 2.2
Relative vapour density (air = 1): 4.71
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.04
Flash point: 27°C c.c.
Octanol/water partition coefficient as log Pow: 1.54 (calculated) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour and by ingestion. 

Effects of short-term exposure
The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation of the vapour may cause lung oedema. See Notes. The effects may be delayed. 

Inhalation risk
A harmful contamination of the air will be reached very quickly on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
MAK: 1.1 mg/m3, 0.2 ppm; peak limitation category: I(2); pregnancy risk group: C 

ENVIRONMENT
The substance is toxic to aquatic organisms. 

NOTES
Reacts violently with fire extinguishing agents such as 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. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations