Phenyltris(trimethylsiloxy)silane

Phenyltris(trimethylsiloxy)silane, commonly known as DC 556 or Dow Corning 556, is a phenyl-functional silicone fluid with CAS number 2116-84-9. It carries no assigned E-code and is registered under EC number 218-320-6. The compound belongs to the silicones and silicates category and is classified under HS code 2931.90.9010.

In personal care formulations, DC 556 functions as a non-greasy carrier fluid that improves spreadability and skin feel by reducing surface tension without leaving heavy residue. In industrial coatings and release applications, its phenyl substitution provides compatibility with organic resins and delivers controlled surface wetting. It also serves as a boundary lubricant in metalworking fluids where thermal stability is required.

This material is supplied as a clear liquid and is subject to REACH registration requirements for EU market placement. Procurement teams should confirm compliance documentation, including Safety Data Sheets aligned with EU GHS standards, prior to ordering. Packaging formats typically include drums and intermediate bulk containers depending on order volume.