What it is
HDI/PPG/Polycaprolactone Crosspolymer is a synthetic polyurethane-type crosspolymer built from hexamethylene diisocyanate, polypropylene glycol, and polycaprolactone units. In sunscreens and cosmetics it functions as a film former that helps distribute the product into an even layer and improves the wear and sensory feel of the finished film. It does not absorb UV itself but supports the performance of the formula's filter system.
Safety & warnings
As a high-molecular-weight cured polymer it is generally non-irritating and not expected to penetrate skin. It is used as a structural film former rather than a biologically active ingredient.
Origin & sourcing
Synthetic; manufactured by crosslinking the named monomer units into a polymer.
Questions everyone asks
What role does this polymer play in a sunscreen?
It acts as a film former, helping the product spread into an even layer and improving the feel and uniformity of the dried film.
Does it provide SPF on its own?
No. It does not absorb UV; it supports the performance and texture of the formula's actual UV filters.