Science
Mechanism of Action
As a salt of Carbomer, Potassium Carbomer functions effectively to modify the rheology of cosmetic formulations, acting as a thickening, gelling, and suspending agent, and providing emulsion stability. When applied topically, its high water-holding capacity enables it to absorb and retain water, forming a protective, thin film on the skin's surface. This film creates a barrier that helps minimize trans-epidermal water loss by reducing evaporation, thereby sustaining skin hydration and preventing dryness. Furthermore, it interacts with mucin within the stratum corneum through hydrogen bonding, forming a wetting layer that also facilitates the enhanced delivery and absorption of other active ingredients within the formulation.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Potassium Carbomer dispersions are acidic in their unneutralized state (typically pH 2.7-3.3 for a 0.5% solution) and necessitate neutralization with a suitable base (e.g., potassium hydroxide, triethanolamine) to swell and achieve optimal gelling and viscosity. The ideal pH range for maximum gelling strength and viscosity generally falls between 5.0 and 10.0, with peak viscosity often observed around pH 6-7. Aqueous gels exhibit good stability during prolonged storage at room temperature and can be sterilized through autoclaving (requiring oxygen exclusion) or gamma irradiation, the latter potentially leading to increased viscosity. At elevated temperatures, stability is improved by incorporating an antioxidant or providing light protection, as exposure to light can induce oxidation and reduce viscosity. UV stability can also be enhanced by using water-soluble UV absorbers (such as benzophenone-2 or -4) in conjunction with edetic acid, or by employing triethanolamine as a neutralizer.
Conflicts
- Phenol
- Cationic polymers
- Strong acids
- High levels of electrolytes
- Resorcinol (causes discoloration)
- Trace levels of iron and other transition metals (can cause catalytic degradation)
- Proteins (with unneutralized Carbopol polymers)
- Povidone (with unneutralized Carbopol polymers)
- Polyethylene glycol (with unneutralized Carbopol polymers)
- Polyethoxylated surfactants (with unneutralized Carbopol polymers)
- Salts (can decrease viscosity)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that crosslinked alkyl acrylates, encompassing Carbomers like Potassium Carbomer, are safe for use in present practices and concentrations, provided they are not polymerized in benzene. For benzene-polymerized variants, further data would be required for a safety determination. Potassium Carbomer is an FDA-approved chemical name, subject to a toxicity restriction that limits benzene content to not more than 0.0002% (2 µg/g). It is intended exclusively for topical application and must be formulated to ensure it is non-irritating to the skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Potassium Carbomer is a versatile and valuable ingredient for achieving desired product textures, enhancing skin hydration, and supporting active delivery across all skin types, provided it is formulated meticulously within its established safety parameters and pH requirements.
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