What it is
Tetrasiloxane is a short linear silicone made of four siloxane units, giving a light, volatile-to-low-viscosity fluid. It provides a silky, non-greasy slip and helps spread other ingredients smoothly, leaving a soft, dry-touch finish. In sunscreens it improves application feel and can help disperse UV filters and pigments evenly.
Safety & warnings
Linear silicone fluids like tetrasiloxane are chemically inert, generally non-irritating, and not common sensitizers. They are generally regarded as low risk for clogging pores.
Origin & sourcing
Synthetic. It is a silicone (organosilicon) fluid produced industrially.
Questions everyone asks
What does tetrasiloxane do in sunscreen?
It is a light silicone emollient that adds silky slip, improves spreadability, and helps leave a smooth, non-greasy finish.
Is tetrasiloxane a silicone?
Yes. It is a short linear silicone fluid built from four siloxane units.