Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

 The vapor pressuer was evaluated using a modified method most appropriate for the large molecular weight, highly viscous, substance that has a very low vapor pressure that cannot be measured by traditional means. The vapor pressure in this study was 0.009 Pa @20 

Key value for chemical safety assessment

Vapour pressure:
0.009 Pa
at the temperature of:
20 °C

Additional information

Vapor pressure was determined using an alternative method most appropriate for this type of material. Based on EPISUITE predictions, the VP was predicted to be extremely low. This is consistent with the molecular weight of the substance and the measured physical & chemical properties. In addition, a supporting study (Cheng, 2014) looked at the headspace vapor of EC 272 -234 -3 after the material was kept at 70C for 3 days and none of the alkyl phenate sulfide substance or impurity TPP (EC 310 -154 -3) was detected, further demonstrating that the vapor pressure is very low.

It should be noted that the substance is comprised of oligomers with molecular weights > 500 and of variable composition and a highly refined, lubricant base oil necessary to act as a solvent for the synthetic reaction and to optimize the reaction kinetics used in the substance’s manufacture. Attempts to remove this base oil from the substance result in changes to the other components’ original structures and the physicochemical characteristics of the substance as a whole. With this in mind, the substance is being registered to include the base oil as a component of the substance and thus the base oil is present in the test material.