Registration Dossier

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.252 mg/L
Assessment factor:
50
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
1.17 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.025 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor
PNEC marine water (intermittent releases):
0.117 mg/L

STP

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

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
0.912 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.091 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

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

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Conclusion on classification

Key parameters for classification:

Note, the assessment is based on results with the silanol hydrolysis product, i.e. dimethylsilanediol. The other hydrolysis product, i.e. methanol, is assumed to have a negligible impact on the environmental hazard profile of the parent substance.

 

Degradation

Biodegradation: not readily biodegradable (0% degradation after 28 d for (OECD 310) based on read across to trimethylsilanol (CAS 1066-40-6).

 

Bioaccumulation

Bioaccumulation is assumed to be low (log Pow: -0.41 for the hydrolysis product dimethylsilanediol)

 

Aquatic acute toxicity

For fish: 96 h, LC50 (Oncorhynchus mykiss, OECD 203): > 126 mg/L (measured arithmetic mean)

For aquatic invertebrates: 48 h, EC50 (Daphnia magna, OECD 202): > 117 mg/L (measured)

For algae/aquatic plant: 72 h, ErC50 (Pseudokirchneriella subcapitata, OECD 201): > 118 mg/L (measured)

 

Aquatic chronic toxicity

For fish: no data available

For aquatic invertebrates: 21 d, NOEC (Daphnia magna, OECD 211): ≥ 12.6 mg/L (measured)

For algae/aquatic plant: 72 h, NOErC (Pseudokirchneriella subcapitata, OECD 201): ≥ 118 mg/L (measured)

 

Dimethoxydimethylsilane is not considered to be rapidly biodegradable according to CLP and has a low potential for bioaccumulation. Moreover, no effects on aquatic organisms were recorded in the available studies with the silanol hydrolysis product. Thus, dimethoxydimethylsilane does not need to be classified according to the consolidated version of Regulation (EC) No 1272/2008 including all further amendments (ATPs).