PPG-12/SMDI Copolymer
Reviewed by Emma · Last updated 18 Aug 2026
A synthetic polymer combined with polypropylene glycol | Offers film-forming and skin-conditioning properties
Addresses
EWG Safety Score
What Is PPG-12/SMDI Copolymer?
PPG-12/SMDI copolymer is a polymer that serves as a film-forming agent in cosmetics products. The SMDI portion stands for Saturated Methylene Diphenyl Diisocyanate, whose monomers (molecules that bond with other molecules to create polymers) are combined with an ultra-light polypropylene glycol (PPG).
Along with film-forming, PPG-12/SMDI copolymer also offers fixative properties to keep key ingredients suspended and helps to condition skin. Usage levels range from 1–5% when it is part of a blend. It’s considered non-irritating and can play a supporting role in creating pleasing liquid and gel textures plus keep such textures stable.
Clinical Evidence & References
Published Research
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Clinical, Cosmetic and Investigative Dermatology, April 2015, pages 179-185 [https://www.dovepress.com/update-on-the-management-of-rosacea-peer-reviewed-fulltext-article-CCID]
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International Journal of Nanomedicine, August 2013, pages 3071-3091 [https://www.dovepress.com/critical-evaluation-of-biodegradable-polymers-used-in-nanodrugs-peer-reviewed-fulltext-article-IJN]
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Danish Ministry of the Environment, Survey of Chemical Substances in Consumer Products 2007, No. 82 [https://www2.mst.dk/Udgiv/publications/2007/978-87-7052-506-0/html/intro_eng.htm]
From the Clinic
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Helps keep products stable | Functions similar to glycerin
Polypropylene Glycol
Polymer of propylene glycol | Functions as a humectant and delivery agent
PPG-14 Butyl Ether
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PPG-20 Methyl Glucose Ether
Blend of polypropylene glycol + methyl glucose derivatives | Helps soften and smooth skin and hair
PPG-26-Buteth-26
Synthetic ingredient that has a variety of cosmetic applications | Functions as a hair conditioning ingredient, surfactant, and emulsifier
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