What it is
Sodium trimetaphosphate is a water-soluble cyclic phosphate salt best known for its ability to cross-link starches and other hydroxyl-bearing polymers, which modifies their texture and thickening behavior. In formulas it can also help bind trace metal ions and assist in maintaining pH. It is used at low levels as a functional processing and stabilizing ingredient.
Safety & warnings
Sodium trimetaphosphate is generally well tolerated at cosmetic use levels and is not associated with comedogenicity. It is not a known fragrance allergen.
Origin & sourcing
A synthetic inorganic phosphate salt manufactured by controlled dehydration of sodium phosphates.
Questions everyone asks
What is its main purpose?
It is mainly used to cross-link starches and polymers to adjust texture and thickening, and it can also help chelate metal ions and buffer pH.
Does it affect sun protection?
No. It is a formulation aid and has no UV-filtering role.