3-ethyl-1,1,1,3,5,5,5-heptamethyltrisiloxane

3-Ethyl-1,1,1,3,5,5,5-heptamethyltrisiloxane, commonly known as Ethyl Trisiloxane and sold under trade names such as Silsoft ETS, is a low-molecular-weight silicone fluid built on a linear trisiloxane backbone with an ethyl substituent at the central silicon. It carries no assigned E-code or HS code classification.

In personal care formulations, it functions as a spreading agent and carrier solvent, reducing surface tension to drive active ingredients into skin or hair substrates. In textile and leather processing, it modifies fiber surface energy to improve water repellency and lubricity. Automotive and metalworking applications use it as a boundary lubricant where its siloxane structure provides thermal stability under friction.

The material is supplied under REACH registration requirements applicable to EU importers and distributors. Procurement teams should confirm grade specification and purity documentation with the supplier prior to order. Packaging formats vary by supplier; consult the product datasheet for available container sizes and storage conditions.