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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Administrative data

Description of key information

Additional information


 Phototransformation in air

No data available (not required for REACH)


Phenol, methylstyrenated, contains constituents of the category phenols that do not possess functional groups that are regarded as being susceptible to hydrolysis under environmental conditions. The test substance is considered to be not hydrolysable.

 Phototransformation in water

No data available (not required for REACH)

Phototransformation in soil

No data available (not required for REACH)


Biodegradation in water: screening tests

The registered UVCB-substance, Oligomerisation and alkylation reaction products of 2-phenylpropene and phenol (OAPP, EC no. 700-960-7), previously known as Phenol, methylstyrenated, was not readily biodegradable under standard test conditions according to OECD TG 310 [CO2 in Sealed Vessels (Headspace Test)]. This finding is confirmed by non-biodegradability in a jpn. MITI(I) test of p-cumylphenol [CAS No. 599-64-4], a dimeric key component of the test substance, in a study according to OECD TG 301C. A non-phenolic dimer of OAPP, 1,1'-(1,1-dimethyl-3-methylene-1,3-propanediyl)bisbenzene [EC no. 228-846-8; CAS no. 6362-80-7] proved to be inherently biodegradable in an OECD 302C assay [MITI(II) test], while in a simulation test acc. to OECD 309, 1,1,3-trimethyl-3-phenylindan [CAS no. 3910-35-8], another non-phenolic dimeric constituent, proved to be persistent (see below).

Biodegradation in water, sediment and soil: simulation tests

In accordance with ECHA Decision letter DEC-SEV-700-960-7-1-1_DEC, an aerobic mineralisation in surface water – simulation biodegradation test (OECD TG 309) on the constituent 1,1,3-trimethyl-3-phenylindan [CAS no. 3910-35-8] was performed. This is a constituent of this UVCB substance and one of three representatives of the dimer fraction. This study showed there was some evidence that the constituent did undergo primary transformation to a non-persistent metabolite and ultimate degradation (complete mineralisation to CO2), but the rate of degradation was slow with reported DT50s  between 542 and 205 days for the 1µg/L and 10µg/L vessels, respectively.

Further simulation studies in sediment and soil are not scientifically necessary, based on the results of this study.

Mode of degradation in actual use

No data available (not required for REACH)



Bioaccumulation: aquatic / sediment

No data is available on phenol methylstyrenated itself. p-Cumylphenol [CAS No. 599-64-4], a mono-phenolic key component of the test substance, showed little bioaccumulating potential in fish, when tested in a valid standard equilibration study according to OECD 305. The BCF values ranged from 65 to 190 after 8 weeks of exposure. Based on accepted QSAR model analysis of the relevant key components, predicted bioconcentration factors in fish begin at about 100 and end at approx. 1100. These results indicate low to moderate bioaccumulation potential of the mixture.

Bioaccumulation: terrestrial

No data available (not required for REACH)

Transport and distribution


Phenol, methylstyrenated, (OAPP) contains components with high logPows ranging from 3.6 to >6.3. Corresponding adsorption constants (organic matter - water), Koc, calculated from the logPow are expected to range from 3.24 - 5.90 (based on Karickhoff 1981: logKoc = 0.989xlogPow - 0.346). Moreover, water solubility is low (1 - 7 mg C/L at a loading of 100 mg/L, the solubility determined by the phenolic components). These properties indicate high adsorption and low mobility in soil.