Propylene, also known by its 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, propylene is a gas. It is colorless, highly flammable, and has an odor similar to garlic. It is found in coal gas and can be synthesized by cracking petroleum. Propylene is a major commodity in the petrochemicals industry. The main use of propylene is as a monomer, mostly for the production of polypropylene.

• Description
  colorless gas; practically odorless
• Molecular Weight
  42.08 g/mole
• Boiling point
  -47.6 degrees C
• Melting Point
  -185.2 degrees C
• Solubility
  Soluble in Alcohol and Ether
• Density of propylene in liquid form
  0.61g/m³.

• Inhalation reference Exposure Level
  3,000micrograms/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)