What it is
Phenyl Trimethicone (CAS 2116-84-9) is a silicone fluid in which a phenyl group is attached to a short siloxane chain, belonging to the phenyl-substituted siloxane family. In formulas it provides a nonoily, easy-to-spread emolliency and helps reduce tackiness and stickiness. On hair it imparts gloss, softness, and improved manageability, and it can also act as an antifoaming agent, which is why it appears in many makeup, sun-care, and hair products.
Safety & warnings
Phenyl Trimethicone is a silicone emollient that is generally considered mild and non-sensitizing in cosmetic use, and its nonoily feel makes it popular in lightweight facial products, including those marketed for oil control. People who prefer to avoid silicones can identify it by its name on the ingredient list.
Origin & sourcing
It is a synthetic silicone, made by building a small siloxane (silicon-oxygen) backbone that carries methyl groups and one phenyl (benzene-ring) substituent; the phenyl group distinguishes it from simpler dimethicones.
Questions everyone asks
What does Phenyl Trimethicone do in skincare and sunscreen?
It is a lightweight silicone emollient that adds smooth slip, reduces stickiness, and gives a soft, nonoily finish to the formula.
How is it different from regular dimethicone?
It has a phenyl (benzene-ring) group on its silicone backbone, which gives it a slightly different feel and adds shine, especially on hair.
Is Phenyl Trimethicone heavy or greasy?
It is described as a nonoily, easy-to-spread emollient, which is why it is often used in lighter-feeling products.