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Physical & Chemical properties

Vapour pressure

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Description of key information

<0.01 hPa at 20 °C; < 0.0000012 at 25°C for the main component; 0.0001166 kPa at 120°C

Key value for chemical safety assessment

Vapour pressure:
0.01 hPa
at the temperature of:
20 °C

Additional information

Justification for read-across

- Group: Disflamoll DPK (EC 907-387-3) and Triphenyl phosphate (TPP) (CAS 115-86-6) - Justification: REACH regulation EC 1907/2006 and ECHA guidance document R.6 allow that substances whose physicochemical, toxicological and ecotoxicological properties are likely to be similar, or follow a regular pattern as a result of structural similarity, may be considered as a group / category of substances. - Chemical similarity: Both substances contain central phosphate groups where the phosphorus atom is connected to four oxygen atoms with one of them double-bonded to the central atom. The three mono-bound oxygen atoms are additionally connected to phenyl groups. In the case of TPP there are only phenyl substituents present, while DPK is a multiconstituent substance, consisting of TPP and structural analogues with up to three methylated phenyl substituents, i.e., tolyl groups. Therefore, the criterion of structural similarity is fulfilled. - Behaviour: For both substances many physico-chemical-, fate- and ecotoxicological endpoints are in the same range, e.g. density, log Pow, biodegradation, adsorption as well as acute toxicities. Therefore, this criterion is also expected to be fulfilled. - In conclusion read-across is justified. It is emphasized that read-across with TPP is only used to extrapolate DPK`s vapour pressure at 120°C which is not possible with the available vapour pressure data for DPK. Processing of DPK takes place at up to this temperature and, therefore, it is necessary to consider this elevated vapour pressure in the exposure assessment of the chemical safety assessment report of Disflamoll DPK.

Initially, the vapour pressure of both substances was compared at 25°C (DPK: 0.00000012 kPa; TPP: 0.000000116 kPa) at which a value also for DPK is available. The conversion factor for DPK:TPP was determined to be 1.0375. In a second step the vapour pressure of TPP at 120°C (0.000112404 kPa) was converted using the factor of 1.0375 to give the vapour pressure for DPK of 0.0001166 kPa.