Decamethylcyclopentasiloxane

Decamethylcyclopentasiloxane (CAS 541-02-6), commonly known as D5 or Cyclomethicone 5, is a cyclic silicone fluid used across personal care, coatings, and industrial applications. It functions as a carrier solvent, surface modifier, and emulsification aid, evaporating cleanly after application without leaving a residue. In personal care formulations, D5 acts as a volatile carrier.

It is used for active ingredients in antiperspirants, hair serums, and skin-conditioning products, improving spreadability and leaving no greasy after-feel. Coatings and release agent manufacturers use it as a solvent. This helps to disperse silicone resins and active components, enabling uniform film formation on treated surfaces. In adhesive and sealant systems, D5 supports cross-linking processes by facilitating distribution.

It ensures the even distribution of curing agents within silicone elastomer matrices. Automotive detailing and surface treatment products incorporate it to deliver silicone-based protective agents onto paintwork. This allows for rubber components to receive controlled, even coverage. Decamethylcyclopentasiloxane is supplied as a clear, low-viscosity liquid in drum and IBC quantities for various industrial needs.

Cosmetic-grade material meeting purity requirements for personal care use is the most commonly traded specification. Technical-grade supply is available for industrial coatings, sealant, and automotive applications. These grades are suitable where specific cosmetic-grade certification is not required. The material remains a staple for manufacturers requiring high-performance volatile silicone carriers in their formulations.