Product Name

  • Name

    2-Butyne

  • EINECS
  • CAS No. 503-17-3
  • Article Data109
  • CAS DataBase
  • Density 0.694g/cm3
  • Solubility
  • Melting Point -32 °C
  • Formula C4H6
  • Boiling Point 25.6°Cat760mmHg
  • Molecular Weight 54.0916
  • Flash Point °C
  • Transport Information
  • Appearance clear colorless to light yellow liquid
  • Safety A simple asphyxiant. Very dangerous fire hazard when exposed to heat or flame; can react with oxidizing materials. Moderately explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemicals. See also ACETYLENE COMPOUNDS and ALKYNES and ARGON (for a description of simple asphyxiants).
  • Risk Codes R12;R36/37;
  • Molecular Structure Molecular Structure of 503-17-3 (2-Butyne)
  • Hazard Symbols R12:Extremely flammable.; R36/37:Irritating to eyes and respiratory system.;
  • Synonyms 2-Butine(3CI); Dimethylacetylene
  • PSA 0.00000
  • LogP 1.02960

CROTONYLENE Chemical Properties

Product Name: Crotonylene (CAS NO.503-17-3)


Molecular Formula: C4H6
Molecular Weight: 54.09g/mol
Mol File: 503-17-3.mol
Einecs: 207-962-2
Melting Point: -32 °C
Boiling point: 25.6 °C at 760 mmHg
Storage Temperature: 2-8°C
Density: 0.691 g/mL at 25 °C(lit.)
Refractive index: n20/D 1.393(lit.)
Surface Tension: 22.4 dyne/cm
Enthalpy of Vaporization: 26.04 kJ/mol
Vapour Pressure: 745 mmHg at 25°C
XLogP3-AA: 1.5
H-Bond Donor: 0
H-Bond Acceptor: 0
Product Categories: Acetylenic Hydrocarbons; Acetylenes

CROTONYLENE Consensus Reports

Reported in EPA TSCA Inventory.

CROTONYLENE Safety Profile

A simple asphyxiant. Very dangerous fire hazard when exposed to heat or flame; can react with oxidizing materials. Moderately explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemicals. See also ACETYLENE COMPOUNDS and ALKYNES and ARGON (for a description of simple asphyxiants).
Safety Information of Crotonylene (CAS NO.503-17-3):
Hazard Codes: F+,Xi
Risk Statements: 12-36/37/38 
12:  Extremely Flammable
36:  Irritating to the eyes 
37:  Irritating to the respiratory system 
38:  Irritating to the skin 
Safety Statements: 16-26-36
16:  Keep away from sources of ignition - No smoking
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36:  Wear suitable protective clothing

CROTONYLENE Standards and Recommendations

DOT Classification:  3; Label: Flammable Liquid

CROTONYLENE Specification

 Crotonylene ,its CAS NO. is 503-17-3,the synonyms is 2-Butyne ; Dimethylacetylene ; Crotonylene ; But-2-yne ; Ch3cequivcch3 ; Butyne .

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