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2-METHYLBUT-3-YN-2-OL
ICSC: 1746
Peer-Review Status: 24.11.2009 Validated
2-Methyl-3-butyn-2-ol
Ethynyldimethylcarbinol 
CAS #: 115-19-5 RTECS #: ES0810000
UN #: 1987
EINECS #: 204-070-5
    Formula: C5H8O/(CH3)2C(OH)CCH
Molecular mass: 84.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Highly flammable.  If powder: NO open flames, NO sparks, and NO smoking.  Use carbon dioxide, foam, dry powder. NO water. 
EXPLOSION Vapour/air mixtures are explosive. Risk of explosion on contact with copper.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact of the substance with water. 
 
EXPOSURE      
Inhalation Cough.  Use ventilation.  Fresh air, rest. 
Skin   Protective gloves.  Rinse skin with plenty of water or shower. 
Eyes Redness. Pain.  Wear safety goggles.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion Dizziness.  Do not eat, drink, or smoke during work.  Rinse mouth. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer.   
EC Classification
 
UN Classification
UN Hazard Class: 3; UN Pack Group: II 
GHS Classification
Signal: Danger
Highly flammable liquid and vapour
Harmful if swallowed
Causes eye irritation 
flam;flameexcl mark;warn

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H1; F3; R1.  Fireproof. Separated from strong oxidants, acids and copper. Cool. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID. 

Physical dangers
The vapour mixes well with air, explosive mixtures are easily formed. 

Chemical dangers
Reacts with oxidants. Reacts with copper. This generates explosion hazard. Reacts violently with acids. Heating may cause violent combustion or explosion. Decomposes on contact with hot surfaces or flames. This produces irritating fumes. 

Occupational exposure limits
TLV not established.
MAK (not established):. 

Routes of exposure
The substance can be absorbed into the body by ingestion. 

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached. 

Effects of short-term exposure
The substance is irritating to the eyes. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 104-105°C
Melting point: 2.6°C
Density (gas): 0.9 kg/m³
Solubility in water: miscible
Vapour pressure, kPa at 20°C: 2
Relative vapour density (air = 1): 2.9
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.04
Flash point: 20°C c.c.
Auto-ignition temperature: 350°C
Explosive limits, vol% in air: 1.8-16
Octanol/water partition coefficient as log Pow: 0.318  
 

NOTES
 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       2-Methylbut-3-yn-2-ol  (SIDS)