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Appendices 1-18 to: Report on the Health Effects of Selected Pesticide Coformulants

Appendix 10: Propylene glycol (PG) 
72     General description

72.1     Identity

Molecular formula:          C₃H₈O₂

Structural formula:           CH₃-CHOH-CH₂OH

Molecular weight:            76

CAS-no.:                        57-55-6

Synonyms:                      Propanediol

                                      Monopropylene glycol

                                      Propane-1,2-diol

                                      alpha-Propylene glycol

                                      Sirlene

                                      1,2-Propanediol

                                      1,2-Dihydroxypropane

                                      Methylethylene glycol

                                      Trimethyl glycol

                                      1,2-Propylene glycol

72.2     Physico / chemical properties

Description:                    Propylene glycol (PG) is a colourless viscous liquid. It is soluble in water and hygroscopic.

Melting point:                  -59 °C

Boiling point:                   189 °C

Density:                          1.036 g/ml (at 20°C)

Vapour pressure:             0.07 mmHg (9.3 Pa) (at 20°C)

Concentration of

saturated vapours:           291 mg/m³             (calculated)

Conversion factor:           1 ppm = 3.16 mg/m³ (at 20°C and 760 mmHg)

                                      1 mg/m³ = 0.316 ppm     

Solubility:                        Water:  ≥ 100 g/l (at 21°C). Also soluble in alcohol.

Partition coefficient

Log K_OW :                      -0.92

References:                    ATSDR (1997), ChemFinder (2002), LaKind et al. (1999).

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