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Propylene Glycol

CAS Number:57‑55‑6

Synonyms:Propane‑1,2‑diol; 1,2‑Propylene glycol; Methyl ethyl glycol; PG; E1520

Chemical Formula:C₃H₈O₂

Molecular Weight:76.09 g/mol

Product Introduction

A clear, colorless, slightly viscous, hygroscopic liquid with faintly sweet taste and virtually no odor. Widely used in food, cosmetics, pharmaceuticals, antifreeze, de-icing, coatings, polymer production (e.g. polyester resins), and smoke/haze generation

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Physical & Chemical Properties

Property	Value
Appearance	Clear, colorless viscous liquid
Odor	Nearly odorless
Density @ 20 °C	~1.036 g/cm³
Melting Point	–59 °C
Boiling Point	188–190 °C
Solubility in Water	Fully miscible
Vapor Pressure @ 20 °C	~10.7 Pa (~0.08 mm Hg)
Viscosity @ 20 °C	~0.042 Pa·s
Log P	−1.34
Flash Point	~99 °C (closed cup)

Applications

Polymer precursor: unsaturated polyester resins, polyurethanes
Food & pharma:humectant, solvent, emulsifier (E1520), flavor carrier, excipient
Cosmetics & personal care:emollient, moisture retainer, preservative
Antifreeze/de‑icer:aircraft and plumbing systems
Smoke effects & analytical solvents

Safety Handling

Low acute toxicity (oral LD₅₀ ~20 g/kg); may cause skin/eye irritation, especially in sensitive individuals . Combustible; use PPE, store sealed in ventilated area.