Hexamethylcyclotrisiloxane

Hexamethylcyclotrisiloxane (CAS 541-05-9), commonly identified in trade as D3, is a cyclic siloxane monomer used as a reactive building block in silicone polymer synthesis. It serves as a precursor and ring-opening monomer for producing polydimethylsiloxane (PDMS) and specialty silicone materials across multiple industrial sectors.

In silicone polymer manufacturing, D3 undergoes ring-opening polymerization to produce PDMS chains with controlled molecular weight, making it a preferred monomer for precise viscosity. Coatings and release liner formulators use silicone polymers derived from D3 to achieve low surface energy, controlled slip, and substrate adhesion profiles in various applications.

In adhesives, sealants, and elastomers, D3-based silicone networks contribute to cross-linked systems with defined cure characteristics and long-term flexibility for industrial use. Personal care manufacturers also source D3 as a deposition aid and film-forming precursor in skin-conditioning and hair care formulations for high-performance consumer products.

Hexamethylcyclotrisiloxane is supplied as a white crystalline solid or flake. It is available in technical and high-purity grades, with purity specifications typically ranging from 98% to 99%+. Packaging is offered in sealed containers to prevent moisture exposure, with bulk and drum quantities available for industrial procurement and large-scale manufacturing needs.