What Is Acrylates/Beheneth-25 Methacrylate Copolymer?
Acrylates/Beheneth-25 Methacrylate Copolymer is a man-made ingredient created by linking together small acrylic and methacrylic acid molecules with a fatty alcohol derivative called behenyl alcohol that has been reacted with about 25 units of ethylene oxide. The result is a large, flexible polymer that can hold and thicken water. It was introduced in the late 1980s when formulators were searching for gentler alternatives to traditional thickening agents used in hair care gels and facial creams. Production begins with plant-derived or synthetic behenyl alcohol, which undergoes ethoxylation to attach the 25 ethylene oxide units. This ethoxylated behenyl component is then polymerized with acrylic or methacrylic monomers in a controlled reaction that yields a smooth, high-molecular-weight copolymer powder or milky liquid. Because of its reliable thickening power and easy dispersibility, you will find it in facial masks, lightweight moisturizers, leave-in hair treatments, styling gels, sunscreens, cleansing milks and many anti-aging lotions.
Acrylates/Beheneth-25 Methacrylate Copolymer’s Cosmetic Benefits/Uses
Its primary role is viscosity controlling, meaning it helps a formula reach the ideal thickness so it feels pleasant, spreads evenly and stays stable on the shelf. By increasing viscosity, it prevents watery separation, keeps pigments or sunscreen agents suspended and allows brands to craft luxe textures without heavy oils or waxes.
Who Can Use Acrylates/Beheneth-25 Methacrylate Copolymer
This polymer is considered friendly for most skin types including oily, combination, normal and dry skin because it is water soluble and free of heavy oils that could clog pores. People with very sensitive or highly reactive skin usually tolerate it well since the molecule stays mostly on the surface and is chemically inert, though those with a known acrylic allergy should be cautious.
The ingredient is synthesized from plant derived or fully synthetic sources and contains no animal by-products so it is suitable for vegans and vegetarians.
No data point to problems for women who are pregnant or breastfeeding when the copolymer is used topically in cosmetic concentrations. Still, this is not medical advice and anyone who is pregnant or nursing should review all skincare and hair care products with a qualified healthcare provider to be extra safe.
Acrylates/Beheneth-25 Methacrylate Copolymer does not absorb UV light and is not known to cause photosensitivity, so it will not make skin more prone to sunburn.
Potential Side Effects/Adverse Reactions
Responses to topical Acrylates/Beheneth-25 Methacrylate Copolymer vary from person to person. The issues listed below are only potential effects and are unlikely for the average user when the ingredient is properly formulated.
- Mild skin irritation or redness, especially on already compromised skin
- Allergic contact dermatitis in individuals sensitive to acrylic or methacrylic compounds
- Transient stinging if applied to broken or freshly shaved skin
- Eye irritation if the product accidentally gets into the eyes
- Residue buildup that may weigh down very fine hair if used in leave-in styling products
If any discomfort or unexpected reaction occurs discontinue use and consult a healthcare professional.
Comedogenic Rating
Rating: 0 / 5
Acrylates/Beheneth-25 Methacrylate Copolymer is water soluble and does not contain heavy oils or waxy fatty acids that tend to block pores. It sits on the surface, forms a flexible film then rinses away easily, so it is unlikely to trap sebum or dead cells inside follicles. For that reason it earns a solid zero on the comedogenic scale.
Because of this low score it is generally suitable for people who are prone to acne or frequent breakouts.
Very occlusive layering, like applying thick balms on top of products that include this polymer, could in theory reduce breathability. As long as it is used in light leave-on formulas or rinse-off products this should not be a concern.
Summary
Acrylates/Beheneth-25 Methacrylate Copolymer is mainly a viscosity controller. By linking water loving acrylic units with a gentle fatty chain it thickens watery formulas, stabilizes suspended pigments and gives creams, gels and lotions a smooth glide without greasy fillers. It has become a quiet workhorse in modern skincare and hair care, especially in clear gels and lightweight moisturizers, though it is not a headline ingredient you will see marketed on the front of the bottle.
Current data classifies it as low risk for irritation, noncomedogenic and safe for use during pregnancy or while breastfeeding. As with any new cosmetic it is smart to patch test a small area first to be sure your skin agrees with the full formula.