Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no hazard identified

Marine water

Hazard assessment conclusion:
no hazard identified

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
100 mg/L
Assessment factor:
10

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
8.9 mg/kg sediment dw
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.89 mg/kg sediment dw
Assessment factor:
1 000
Extrapolation method:
assessment factor

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
5.03 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
44.4 mg/kg food
Assessment factor:
90

Additional information

General discussion:

A full aquatic dataset is available; one key study, short-term as well as long-term, is available for each trophic level (some on analogous CAS 25155 -25 -3). To summarize no effect of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide was observed up to its water solubility limit (0.04 mg/L). As a consequence, there is no hazard identified for the aquatic compartment.

To be able to derive a PNEC for the soil compartment a PNEC for the aquatic compartment is derived and used in the Equilibrium Partitioning Method (EPM).

We propose to consider the water solubility limit as a NOEC value and use an assessment factor of 10 as a full aquatic dataset is available, to derive the PNEC aquatic. The PNEC aquatic to be used in the EPM is 0.004 mg/L.

Conclusion on classification

One key study is available for each acute- and chronic endpoint. To summarize no effect of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide was observed up to its water solubility limit (0.04 mg/l).

However, [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is not readily biodegradable (OECD 301D) and its log Kow was estimated at 7.3.

That is the reason why according to 67/548/ECC, [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is classified "Aquatic chronic category 4".