Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Commercial tripropylene glycol is a colourless, odourless, very hygroscopic and moderately viscous liquid with a melting point below - 20˚C (Harlan Laboratories Ltd., 2010d) and a boiling point of 270 ºC (Harlan Laboratories Ltd., 2010d). The relative density of tripropylene glycol with respect to the density of water at 4 ˚C is 1.02 at 20 ˚C (Harlan Laboratories Ltd., 2010d). The vapour pressure of tripropylene glycol is 0.26 Pa at 25 °C (Harlan Laboratories Ltd., 2010c). Tripropylene glycol is fully miscible with water at 20 ˚C and pH = 7.1-8.4 (Harlan Laboratories Ltd., 2010d). The octanol/water partition coefficient (log Pow) is equal to -0.379 at 21.5°C and pH = 5.9 (Harlan Laboratories Ltd., 2010d). Tripropylene glycol has a static viscosity of 77.3 mm2/s at 20 °C and 23.4 mm2/s at 40˚C (Harlan Laboratories Ltd., 2010d).

The substance has a flash point of 145°C at 100.11 kPa (Harlan Laboratories Ltd., 2010c). Based on this value and the boiling temperature, classification for flammable properties is not warranted in accordance with EU Directive 67/548/EEC and EU Classification, Labeling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008. The auto-ignition temperature of tripropylene glycol is ca. 232 °C at 101.08 - 102.33 kPa (Harlan Laboratories Ltd., 2010c). The substance is not expected to have explosive and oxidising properties, therefore classification in accordance with EU Directive 67/548/EEC and EU Classification, Labelling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008 is not warranted.

The substance remains undissociated in water, as it does not contain chemical groups which can undergo dissociation.

In accordance with column 1 or 2 of REACH Annex VII/IX and/or with section 1 of REACH Annex XI and/or the REACH guidance on information requirements and chemical safety assessment (chapter R7. A), data on the particle size distribution, pyrophoricity, water reactivity and stability in organic solvents and identity of relevant degradation products do not need to be conducted.