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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

The SRC AOPWIN program was used to obtain values of the rate constant kOH for reaction of each constituent with hydroxyl radicals. The program outputs are used to calculate a weighted average value for each block based on the modelled composition of ' Paraffin waxes (Fischer–Tropsch), full-range, C15–C50 branched and linear'. The calcuated values are presented in Table xxx of the CSR.

EUSES 2.1.2 calculates an overall half-life in air under default conditions of hydroxyl radical concentration, using the following expressions:

kdegair (d-1) = kOH (cm3/molecule-sec) x OHConcair (molec/cm3) x 24 x 3600

Half-life is then calculated as:

DT50 (d) = ln 2/ kdegair (d-1)


kdegair = total rate constant for degradation in air

kOH = rate constant for reaction with hydroxyl radicals

OHConcair = concentration of hydroxyl radicals in air

DT50 = half-life