Propylene

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Not to be confused with glucomannan (also known as propolene).

Propylene
Image:Propylene skeletal.svg
Image:Propylene.png
IUPAC name	Propene
Identifiers
CAS number	[115-07-1]
RTECS number	UC6740000
SMILES	C=CC
Properties
Molecular formula	C₃H₆
Molar mass	42.08 g/mol
Appearance	colourless gas
Melting point	− 185.2 °C (88.0 K)
Boiling point	− 47.6 °C (225.5 K)
Solubility in water	0.61 g/m³ (? °C)
Viscosity	8.34 µPa·s at 16.7 °C
Structure
Dipole moment	0.366 D (gas)
Hazards
MSDS	External MSDS
Main hazards	Highly flammable, Asphyxiant
NFPA 704	Image:NFPA 704.svg 4 1 1
R-phrases	12
S-phrases	9-16-33
Flash point	−108 °C
Related compounds
Related groups	Allyl, Propenyl
Related compounds	Propane, Propyne Allene, 1-Propanol 2-Propanol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Propylene (or IUPAC name propene) is an organic compound having the chemical formula C₃H₆. It is the second simplest member of the alkene class of hydrocarbons, ethylene (ethene) being the simplest. At room temperature and pressure, propene is a colourless and inflammable gas. As it also has no smell, (as with most other gaseous hydrocarbons) it is mixed with minute quantites of mercaptans, sulforous compounds with a powerful garlic smell to make it more easily detectable). It is found in coal gas and can be synthesized by cracking petroleum. Propene is a major commodity in the petrochemicals industry. The main use of propene is as a monomer, mostly for the production of polypropylene. Propene is also used as a fuel gas for various industrial processes. It has a similar calorific value to propane, but a lower mass of combustion products, so it has a higher flame temperature. Propene also has significantly higher vapour pressure than propane at room temperature. It is unsaturated

Inhalation reference exposure level
3,000 µg/m³ (2,000 ppb)
Hazard index
Respiratory system
Critical effects: squamous metaplasia (males and females), epithelial hyperplasia (females only), inflammation of the nasal cavity in Fischer 344/N rats (males only)