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EC number: 218-320-6 | CAS number: 2116-84-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water: screening tests: 2.2% in 28 days (O2 consumption, OECD 301F), based on read-across from a structurally-related substance
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
There are no reliable ready biodegradation data available for tris(trimethylsiloxy)phenylsilane (CAS No. 2116-84-9), therefore good quality data for the structurally-related substance, 3-[(dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxane (CAS No. 60111-47-9), have been read across.
Tris(trimethylsiloxy)phenylsilane (CAS No. 2116-84-9) and 3-[(dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxane (CAS No. 60111-47-9) are structurally-similar substances. They are both branched tetrasiloxanes with a phenyl substituent at the central silicon atom. The difference between them is that the target substance has three methyl groups at each of the terminal silicon atoms, whereas the source substance has two methyl groups and one vinyl group at each of the terminal silicon atoms. It is expected that the substitution of the methyl with vinyl group will not affect the biodegradation result.
Tris(trimethylsiloxy)phenylsilane (CAS No. 2116-84-9) and 3-[(dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxane (CAS No. 60111-47-9) are within an analogue group of substances within which, in general, there is no evidence of any significant biodegradation.
Therefore, in the context of the RAAF, Scenario 6 is considered to apply. The Category hypothesis is that read-across of “not readily biodegradable” between siloxanes is appropriate where data are not available for the substance itself. Additional information is given in a supporting report (PFA, 2017) attached in Section 13.
The table below presents ready biodegradation data for substances within the Siloxane Category.
Table: Ready biodegradation data for substances within the siloxane analogue group of chemicals
CAS |
Name |
Readily biodegradable? Yes/no |
Result: Biodegradation after 28 days (%) |
Guideline |
Test type |
Reliability |
107-46-0 |
Hexamethyldisiloxane |
No |
2% |
OECD 301C |
BOD |
1 |
107-51-7 |
Octamethyltrisiloxane |
No |
-3.70% |
OECD 310 |
CO2 |
1 |
540-97-6 |
Dodecamethylcyclohexasiloxane |
No |
4.5% |
OECD 310 |
CO2 |
1 |
541-02-6 |
Decamethylcyclopentasiloxane |
No |
0.14% |
OECD 310 |
CO2 |
1 |
541-05-9 |
Hexamethylcyclotrisiloxane |
No |
0.06% |
OECD 310 |
CO2 |
1 |
556-67-2 |
Octamethylcyclotetrasiloxane |
No |
3.70% |
OECD 310 |
CO2 |
1 |
1873-88-7 |
1,1,1,3,5,5,5-heptamethyltrisiloxane |
No |
0% |
OECD 310/ ISO Guideline No 14593 |
CO2 |
1 |
2627-95-4 |
1,1,3,3-tetramethyl-1,3-divinyldisiloxane |
No |
0% |
OECD 301D |
BOD |
1 |
17928-28-8 |
1,1,1,3,5,5,5-heptamethyl- 3-[(trimethylsilyl)oxy] trisiloxane |
No |
0% |
OECD 301F |
BOD |
1 |
17955-88-3 |
1,1,1,3,5,5,5-heptamethyl-3-octyltrisiloxane |
No |
10 – 32 % after 25 d |
OECD 301B |
CO2 |
1 |
60111-47-9 |
3-[(dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxane |
No |
2.20% |
OECD 301F |
BOD |
1 |
70940-00-0 |
1,1,7,7,-Tetramethyl-3,3,5,5,-Tetraphenyl-Tetrasiloxane |
No |
9.7 and 9.9% |
OECD 301B |
CO2 |
1 |
180073-46-5 |
Pentasiloxane, 1,1,9,9-tetramethyl-3,3,5,5,7,7-hexaphenyl- |
No |
5.2 and 4.4% |
OECD 301B |
CO2 |
1 |
It is therefore considered valid to read-across the results for3-[(dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxaneto fill the data gap for the registered substance. Additional information is given in a supporting report (PFA, 2017) attached in Section 13.
3-[(Dimethylvinylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-1,5-divinyltrisiloxane attained 2.2% biodegradation in 28 days (O2 consumption).
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