What Is Polyquaternium-62?
Polyquaternium-62 is a synthetic polymer created by linking together several smaller molecules, including butyl methacrylate, polyethylene glycol methyl ether methacrylate, ethylene glycol dimethacrylate and 2-methacryloylethyl trimonium chloride, with the help of an initiator called 2,2′-azobis(2-methyl propionamidine) dihydrochloride. The result is a quaternary ammonium compound that carries a positive charge along its backbone. That built-in charge is what makes it so useful in personal care since hair and skin surfaces tend to be slightly negative and readily attract the polymer.
Quaternary ammonium polymers entered the cosmetics scene in the 1970s as formulators searched for ingredients that could tame frizz and improve style hold without leaving heavy buildup. Polyquaternium-62 is one of the newer members of this family, designed to give a lighter feel and better compatibility with modern water-based formulas.
Manufacturing starts with purifying the monomers, then mixing them in a controlled reactor. The initiator triggers a chain reaction that stitches the monomers together into long, branching chains. Temperature, pH and reaction time are carefully monitored to reach the right molecular weight for cosmetic use. After polymerization the mixture is neutralized, filtered and standardized into an easy-to-handle aqueous solution or powder.
You will most often see Polyquaternium-62 in rinse-off products like shampoos, conditioners and color-protecting treatments, as well as leave-on stylers such as gels, mousses and setting sprays. It also finds its way into hair masks and some cream-based serums where light film-forming properties are desirable.
Polyquaternium-62’s Cosmetic Benefits/Uses
This ingredient offers two main functions that improve the performance of haircare formulas.
- Film forming – Once applied, it creates a thin, invisible layer over each strand that smooths the cuticle, reduces moisture loss and adds a soft touch without weighing hair down
- Hair fixing – Its positively charged polymer chains link together on the hair surface, providing flexible hold that helps styles stay in place longer while resisting humidity and frizz
Who Can Use Polyquaternium-62
Because Polyquaternium-62 is water soluble and lightweight, it is considered suitable for all hair and scalp types including oily, normal and dry. Its thin film helps lock in moisture without trapping excess oil so even fine or easily weighed-down hair can benefit. People with very sensitive scalps may still wish to check labels for added fragrances or dyes that could be the true source of irritation rather than the polymer itself.
The ingredient is entirely synthetic and does not rely on animal-derived raw materials, which makes it appropriate for both vegans and vegetarians. Manufacturing does not require animal testing in most regions, though final product policies vary by brand.
Current safety data show no specific risks for pregnant or breastfeeding women when Polyquaternium-62 is used in rinse-off or leave-on hair products. This information is educational only; anyone who is pregnant or nursing should review their personal care routine with a healthcare professional to be safe.
Polyquaternium-62 is not known to cause photosensitivity, so it will not increase the likelihood of sunburn or pigment changes. It is also color-safe, making it a good choice for chemically treated hair.
Potential Side Effects/Adverse Reactions
Reactions to topical Polyquaternium-62 can differ from one person to the next. The issues listed below are possible yet uncommon, and most users will not experience them when the ingredient is properly formulated and used as directed.
- Mild scalp or skin irritation in people who are highly sensitive to cationic polymers
- Contact dermatitis marked by redness or itching if an individual becomes allergic to the polymer or to impurities left from production
- Eye irritation if sprays or mousses are applied too close to the eyes
- Product buildup and dullness when very high levels are used repeatedly without thorough cleansing
- Precipitation with certain anionic ingredients which can leave a flaky residue in rare formula incompatibilities
If any irritation, rash or other unwanted effect develops stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 0 (non-comedogenic)
Polyquaternium-62 is water soluble, carries no oily or waxy components and has a large molecular size that keeps it on the surface rather than letting it seep into pores. All of this means it does not block follicles or encourage blackheads so it earns the lowest possible score. Because of that it is generally suitable for skin that is prone to acne or frequent breakouts. Its use is also limited mainly to hair products which are usually rinsed off or applied to strands rather than facial skin, further lowering any clogging risk. No other comedogenic concerns have been flagged in the scientific or consumer literature.
Summary
Polyquaternium-62 is a cationic polymer that smooths and shields hair by forming a thin breathable film while also linking strands together for flexible style hold. Its positive charge lets it cling to the negatively charged hair surface so the benefits last until the next wash. Though not yet a blockbuster ingredient it is appearing more often in modern shampoos conditioners and styling sprays where light touch and minimal buildup are priorities. Safety reviews show a very low irritation profile with no comedogenic issues and no known links to systemic toxicity. As with any new formula it is sensible to patch test when trying a product containing Polyquaternium-62 to confirm personal compatibility.