What it is
Pentasodium Triphosphate is an inorganic phosphate salt that binds metal ions, which helps stabilize formulas by limiting metal-catalyzed degradation and improving the performance of other ingredients. It can also contribute to pH buffering and influence texture. In sunscreens it is typically used at low levels as a formulation aid rather than as an active ingredient.
Safety & warnings
Used as a chelating and buffering aid at the low levels typical in cosmetics, it is generally well tolerated. It is alkaline in concentrated form, so finished products are pH-adjusted; it is not a recognized fragrance allergen or a comedogen.
Origin & sourcing
Synthetic; an inorganic sodium phosphate salt manufactured industrially.
Questions everyone asks
What does Pentasodium Triphosphate do in a formula?
It acts mainly as a chelating agent that binds metal ions, helping stabilize the product, and can assist with pH buffering.
Is it the same as sodium tripolyphosphate?
Yes. Sodium tripolyphosphate is a common name for the same compound.