What it is
C15-19 Alkane is a mixture of saturated branched hydrocarbons in the fifteen-to-nineteen carbon range, valued for a dry, silky slip that mimics the sensory feel of volatile silicones. In sunscreens it helps disperse UV filters, improve spreadability, and leave a lightweight, non-greasy finish. It is colorless, odorless, and compatible with a wide range of other oils and emollients.
Safety & warnings
As an inert, highly purified hydrocarbon it is generally well tolerated, with low irritation and sensitization potential. Its light, branched structure makes it less occlusive than heavier oils, and it is typically regarded as having low comedogenic potential, though individual responses to any emollient can vary.
Origin & sourcing
It can be produced synthetically from petroleum-derived feedstocks or, in many current cosmetic grades, made from fermented or hydrogenated plant sugars and oils, which is why it is often marketed as a renewably sourced alternative to silicones.
Questions everyone asks
Is C15-19 Alkane a silicone?
No. It is a hydrocarbon emollient, not a silicone, though it is often chosen to recreate the smooth, dry slip that silicones provide while offering a plant-derived option.
Does C15-19 Alkane provide sun protection?
No. It is an emollient and spreading agent that improves texture and helps distribute UV filters; it does not absorb or reflect UV radiation itself.