Polyquaternium-28

Polyquaternium-28 1
Synthetic
Occlusive
Clean
1-Propanaminium, N, N, N-trimethyl-3-((2-methyl-1-oxo-2-propenyl)amino)-, chloride, polymer with 1-ethenyl-2-pyrrolidinone
CAS #
131954-48-8
Form
Powder
Functions
Antistatic
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Reduces Static
Creates Protective Barrier
Locks In Moisture
Creates protective layer
Reduces flyaways
Traditional Use
A synthetic polymer developed in the 1990s for cosmetic applications. Designed to provide enhanced conditioning and substantivity in shampoos and conditioners while improving product stability.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR