Polymethacrylamidopropyltrimonium Methosulfate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: July 1, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Polymethacrylamidopropyltrimonium Methosulfate?

Polymethacrylamidopropyltrimonium Methosulfate, often shortened to PMAPTS, is a synthetic polymer created by reacting sulfuric acid dimethyl ester with a specially modified methacrylamide monomer that carries a quaternary ammonium group. The result is a long-chain molecule that holds a positive charge, making it highly attracted to negatively charged surfaces like hair strands and some skin proteins.

The ingredient was first explored in the late 1990s as chemists searched for alternatives to traditional silicones and cationic surfactants that could deliver smoothness without heavy buildup. Its popularity grew after formulators noticed its ability to form light, flexible films that resist humidity and static. Today it is produced in closed-loop reactors where the monomer is polymerized in water, then neutralized and purified to remove unreacted materials before being spray-dried or kept as an aqueous solution.

You will most often spot Polymethacrylamidopropyltrimonium Methosulfate in rinse-off and leave-in conditioners, anti-frizz serums, hair masks, styling creams and certain lightweight moisturizers aimed at taming flyaways. It can also appear in body lotions and creams that promise a silky after-feel, though its main stage remains hair care.

Polymethacrylamidopropyltrimonium Methosulfate’s Cosmetic Benefits/Uses

Below is a breakdown of what this multitasking polymer brings to a formula

  • Antistatic: Its positive charge neutralizes the negative charge that builds up on hair during brushing or dry weather, cutting down on static cling and flyaways
  • Film Forming: It lays down a thin breathable layer over hair or skin that locks in moisture, adds a light touch of shine and improves product spreadability
  • Hair Conditioning: Because it binds to damaged areas of the hair cuticle, it leaves strands feeling smoother, easier to detangle and less prone to breakage

Who Can Use Polymethacrylamidopropyltrimonium Methosulfate

PMAPTS is considered skin friendly for the vast majority of people, including those with dry, oily or combination skin. Its lightweight film forming nature rarely clogs pores so it is also generally accepted by acne-prone complexions. Very sensitive or highly reactive skin types may wish to proceed with extra care, simply because any cationic polymer can on occasion trigger mild redness or itchiness in that group.

The ingredient is synthesized entirely from petrochemical feedstocks and contains no animal-derived components, making it suitable for vegans and vegetarians. No animal testing is required for the polymer in most regions, though finished product policies vary by brand.

Current safety data shows no evidence that topical PMAPTS is absorbed through intact skin in meaningful amounts, so it is not expected to pose a risk to people who are pregnant or breastfeeding. This is not medical advice and anyone who is expecting or nursing should review all personal care products with a healthcare professional to be safe.

PMAPTS does not increase sensitivity to sunlight, so there is no special need for extra sun protection beyond the usual daily SPF habit.

The polymer is water soluble and rinses away cleanly, making it compatible with most hair and body care routines, including color-treated hair where silicones might weigh strands down.

Potential Side Effects/Adverse Reactions

Responses to topical Polymethacrylamidopropyltrimonium Methosulfate vary from person to person. The issues listed below are possible yet uncommon when the ingredient is used at typical levels in well formulated products.

  • Mild scalp or skin irritation in individuals with very sensitive skin
  • Transient eye stinging if the product accidentally gets into the eyes before it is rinsed out
  • Allergic contact dermatitis which may appear as redness rash or itching in people with a specific allergy to the polymer or formulation preservatives
  • Product buildup leading to limp or dull hair when heavily layered without regular cleansing

If any discomfort swelling or persistent irritation occurs stop using the product and seek advice from a qualified healthcare provider.

Comedogenic Rating

Rating: 0–1 (virtually non-comedogenic)

PMAPTS is a large, water-soluble polymer that sits on the surface then rinses away without seeping into pores. It is not oily or waxy and it does not form an occlusive film, so it has very little potential to trap sebum or dead skin cells. For that reason it earns a score at the very bottom of the comedogenic scale.

Suitable for acne-prone or breakout-prone skin in most rinse-off and leave-in formulas.

Because the polymer carries a positive charge it actually repels excess sebum, further lowering the chance of pore congestion.

Summary

Polymethacrylamidopropyltrimonium Methosulfate works as an antistatic hair conditioner and lightweight film former. Its positive charge helps it cling to damaged cuticles smoothing frizz and easing detangling while its thin breathable film locks in moisture and adds slip.

Although it is not as famous as silicones or quats found in classic conditioners it has carved out a steady fan base among formulators looking for a feather-light finish that rinses clean. You will mainly encounter it in modern conditioners serums and some body lotions aimed at a non-greasy feel.

Current research and long-term use reports show PMAPTS to be low risk for irritation or sensitization when used at normal cosmetic levels. As with any new skincare or hair care product it is wise to perform a quick patch test to rule out individual sensitivities before full use.

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