Propylene glycol
Propane-1,2-diol is the simplest member of the class of propane-1,2-diols, consisting of propane in which a hydrogen at position 1 and a hydrogen at position 2 are substituted by hydroxy groups. A colourless, viscous, hygroscopic, low-melting (59C) and high-boiling (188C) liquid with low toxicity, it is used as a solvent, emulsifying agent, and antifreeze. It has a role as a protic solvent, an allergen, a mouse metabolite and a human xenobiotic metabolite. It is a glycol and a member of propane-1,2-diols.
IUPAC: propane-1,2-diol
PubChem
Physical & Chemical Properties
| Melting Point | -76 °F (NTP, 1992) |
| Boiling Point | 370.8 °F at 760 mmHg (NTP, 1992) |
| Density | 1.04 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | greater than or equal to 100 mg/mL at 70 °F (NTP, 1992) |
| Flash Point | 210 °F (NTP, 1992) |
| Vapor Pressure | 0.08 mmHg at 68 °F ; 0.13 mmHg at 77 °F (NTP, 1992) |
| Appearance | Thick odorless colorless liquid. Mixes with water. (USCG, 1999) |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2905
Data: UN Comtrade
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