What is Polyquaternium-28 and how does it fit the series?
Polyquaternium-28 (CAS 131954-48-8, repeat unit C16H30ClN3O2, MW 331.9) is a cationic polymer in the INCI Polyquaternium family, with listed cosmetic functions of conditioning and film formation. It shares the cationic charge of the series while having its own polymer backbone. RawSource supplies it in bulk to specification.
POLYQUATERNIUM-28- ▸ Hair fixative: Delivers hold in styling formulations
- ▸ Film forming: Forms conditioning films with good clarity
- ▸ Conditioning: Cationic conditioning and combability benefits
- ▸ Antistatic: Reduces static on treated hair
| Grade | CAS No. | Listed functions | Repeat-unit formula |
|---|---|---|---|
| Polyquaternium-2 | 68555-36-2 | Conditioning, film formation | C15H34Cl2N4O2 |
| Polyquaternium-7 | 26590-05-6 | Conditioning, film formation, thickening | — |
| Polyquaternium-10 | 68610-92-4 | Conditioning, film formation, thickening | — |
| Polyquaternium-11 | 53633-54-8 | Conditioning, film formation | C18H34N2O7S |
| Polyquaternium-28 you are here | 131954-48-8 | Conditioning, film formation | C16H30ClN3O2 |
How to choose: Polyquaternium is an INCI family of cationic (positively charged) polymers, not a single molecule — each number is a distinct backbone. Polyquaternium-7 is an acrylamide/DADMAC copolymer; the series is grouped for their shared cationic charge and film-forming/conditioning function profile. Members that also carry a thickening/rheology role (PQ-7, PQ-10) contribute viscosity in addition to substantivity.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Polyquaternium-28 (CAS 131954-48-8) is a cationic copolymer of vinylpyrrolidone and methacrylamidopropyl trimethylammonium chloride. It functions as a film former, hair fixative, antistatic, and conditioning agent in personal-care formulations. It is a reviewed cosmetic ingredient used in styling and conditioning products.
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Clean-Rinse Film-Forming Styling Polymers (Beauty & Personal Care)
Frequently Asked Questions
What is Polyquaternium-28?
Polyquaternium-28 (CAS 131954-48-8) is a cationic copolymer of vinylpyrrolidone and methacrylamidopropyl trimethylammonium chloride. It is used in personal-care styling and conditioning products.
What is Polyquaternium-28 used for?
It functions as a hair fixative for hold, a film former that produces conditioning films with good clarity, a conditioning agent for combability, and an antistatic agent. These properties suit styling and leave-in formulations.
Is Polyquaternium-28 a silicone?
No. It is a quaternary-ammonium copolymer (vinylpyrrolidone with a quaternized methacrylamide monomer), not a silicone. Silicone conditioning polymers are a different chemistry available under separate grades.
How is Polyquaternium-28 supplied in bulk?
It is generally supplied as an aqueous solution; active content varies by grade. Verify the active percentage on the CoA, request the SDS, and send your volume and packaging for a bulk quote.
What is the CAS number and identity documentation for Polyquaternium-28?
Its CAS number is 131954-48-8. A batch CoA and SDS are available on request to confirm identity and specifications.