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Physical & Chemical properties

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Description of key information

Physico-chemical properties of enantiomers are essentially identical, except for those dependent on a chiral environment (e.g. rotation of plane of polarization of polarized light, i.e. optical activity). See e.g. Therefore, data for L-lactic acid are fully valid for D-lactic acid.

D-lactic acid is a slightly viscous, colour- and odourless liquid and has neither flammable, explosive nor oxidizing properties.

Further properties and characteristics are summarized in the following table:

Melting point

53 °C

Boiling point

216.6 °C


1.2 g/cm3

Vapour pressure

0.038 Pa at 25 °C

Partition coefficient Log Kow

-0.54 at 20 °C

Water solubility

860 g/L

Surface tension

70.7 mN/m

Self-ignition temperature

> 400 °C

Dissociation constant pKa

3.85 at 20 °C


18.4 mPa s at 20 °C


Additional information