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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Alkylation and transalkylation products of biphenyl with propene is an UVCB substance composed of different constituents. Each constituent is present as a mixture of isomers with unknown composition. Based on the complex composition in combination with the physico-chemical properties of the substance testing is technically not feasible. Therefore, the bioaccumulation potential of the substance was assessed in a weight of evidence approach using study results from a minor constituent of the UVCB (diisopropylnaphthalene; DIPN) and QSAR estimates for the main constituents (i.e. diisopropyl biphenyl; DIPB & triisopropyl biphenyl; TIPB).

For the minor constituent DIPN (diisopropylnaphthalene), several BCF values were determined in a bioaccumulation study according to OECD 305, ranging from 379 to 3930 (CITI, 1992). For the main constituents DIPB (diisopropyl biphenyl) and TIPB (triisopropyl biphenyl) the potential for bioaccumulation (i.e. the bioconcentration factor, BCF) was predicted using four different (Q)SAR models.

The predicted BCF values range from 537 L/kg (KNN/Read-Across v.1.1.0) to 11674 L/kg (Meylan Model v1.0.3) for DIPB and from 353 L/kg (CAESAR v2.1.14) to 3739 L/kg (Meylan Model v1.0.3) for TIPB. The TIPB isomers most probably do not meet the criterion for ”very bioaccumulative” (vB; BCF > 5000 L/kg), whereas this cannot be completely ruled out for DIPB isomers. 

Additional information