Potassium Cetyl Phosphate (Emulsifier K)

Potassium Cetyl Phosphate (often branded as Amphisol K) is a high-performance, anionic oil-in-water (O/W) emulsifier and surfactant used in cosmetics to bind water and oil, stabilize lotions/creams, and enhance texture. It is especially prized for boosting SPF, improving water resistance in sunscreens, and ensuring stability in challenging, high-pigment, or low-viscosity formulas.

Key Uses and Functions:

Emulsifier & Stabilizer: Acts as a primary emulsifier (typically 1-3%) to create stable, white, and elegant textures in creams, lotions, and, in some cases, liquid soaps.

Sunscreen Enhancer: Highly effective at increasing the water resistance and SPF efficiency of sunscreen products.

Skin Compatibility: Known for being very gentle on the skin, making it suitable for sensitive skin formulations.

Versatility: Used in various personal care products, including shampoos, makeup removers, facial cleansers, and lotions.

It is a PEG-free, anionic surfactant that can be used in formulations with a broad pH range.