Octamethylcyclotetrasiloxane (D4)

formula: C8H24O4Si4; CAS Registry Number: 556-67-2
Structure of Octamethylcyclotetrasiloxane (D4)
Source: PubChem
Identifier: CID 11169
URL: https://pubchem.ncbi.nlm.nih.gov/compound/11169#section=2D-Structure

Persistent, bioaccumulative and toxic compound (PBT) and very persistent, very bioaccumulative (vPvB) compound


  • Bioindicator in rivers and lakes
  • As the only viviparous fish in German nearshore waters, it is a bioindicator in nearshore coastal marine ecosystems.

Sampling area

Sampling period

1995 - 2018