Film Former
HYDROXYPROPYL METHYLCELLULOSE PHTHALATE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A cellulose-phthalate polymer used as an enteric coating and film former. Polymer-bound phthalic acid, not a plasticiser phthalate.
Hydroxypropyl methylcellulose phthalate (HPMCP, CAS 9050-31-1) is a pharmaceutical and food-grade polymer in which phthalic-acid esters are chemically bound to a cellulose backbone. It is widely used as an enteric coating for pharmaceuticals and in some cosmetics as a film former or pH-responsive matrix. Crucially, it is NOT the same toxicological entity as low-molecular-weight plasticiser phthalates (DEHP, DBP) flagged in EU Annex II — the bound form is not bioavailable and has a clean pharmacopoeial safety profile. Acidic hydrolysis releases phthalic acid (of low toxicity). No CIR monograph, but broad pharmaceutical safety data.
Function
Skin benefits
- Polymeric film former and enteric coating polymer
- Used as thickener and film aid in oral care and some leave-on products
- Bioinert pharmaceutical excipient
Known concerns
- Phthalate ester moiety may raise consumer concern despite polymer-bound phthalic acid not behaving like plasticiser phthalates
- Hydrolysis could release low levels of phthalic acid
- Limited dedicated cosmetic safety review
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related film formers
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.