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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

-4.68 (Key study)  based on calculation of the average log Pow of the relevant peaks 
- 4.85 at 25 degrees Celsius (supporting study)

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
25 °C

Additional information

In a key study average log Powcalculation is based on the main mixture components TPP and C4 according to the following equation (OECD 117 section 9):

weighted average log Pow= log P area %[ (Ʃ Row(peak i) ·  area % (peak i) ) ÷ (total peak area %)]

 = (3.78*42.2+5.57*42.7)/84.9 =4.68

In a supporting study, the log Kow of Phosflex 61B was determined according to OECD Guideline 107 using the shake-flask method. The log Kow of Phosflex 61B was found to be 4.85 +/- 0.0659 at 25 degrees Celsius.