POLYQUATERNIUM-91 is graded A (Safe) by Expert·ING, based on COSING regulatory data.
POLYQUATERNIUM-91
Safety grade: A
This is a conditioning polymer that creates a thin, protective layer on hair strands. It's a lab-created ingredient designed to improve how hair feels and looks by adding smoothness and shine.
It coats the hair to reduce frizz, add moisture, improve manageability, and create a protective film that makes hair appear smoother and shinier.
Graded using: COSING.
Last verified: May 26, 2026
Other Film Forming ingredients
- CELLULOSE GUM — Grade A
- GUAR HYDROXYPROPYLTRIMONIUM CHLORIDE — Grade A
- POLYQUATERNIUM-7 — Grade B
- POLYQUATERNIUM-10 — Grade A
- HYDROXYETHYLCELLULOSE — Grade A
- ACRYLATES COPOLYMER — Grade A
- MALTODEXTRIN — Grade A
- CERA ALBA — Grade A