Amphisol K

Description

Amphisol K, also known as Potassium Cetyl Phosphate, is an anionic oil-in-water emulsifier used in cosmetic formulations, particularly in sunscreens. It’s known for creating stable, water-resistant formulations and can also boost SPF protection and increase water resistance in emulsions. It forms liquid crystalline lamellar and vesicle structures, as well as unique microdomains, which contribute to its stability.
Here’s a more detailed breakdown:
Key Properties and Benefits:
Emulsifier: Amphisol K is a highly effective emulsifier, meaning it helps combine oil and water-based ingredients to create stable cosmetic products.
Stable and Water-Resistant: It’s particularly well-suited for sunscreens due to its ability to create formulations that are both stable and resistant to water.
Boosts SPF: Amphisol K can enhance the SPF (Sun Protection Factor) of sunscreens.
Increases Water Resistance: It helps to make emulsions more resistant to being washed away by water.
Forms Microdomains: The formation of microdomains within the formulation is thought to contribute to its long-term stability and prevents separation of ingredients.
Compatible with Skin Lipids: The cetyl moiety (a part of the molecule) is known to be compatible with skin lipids, contributing to a rich texture and feel.
Thermally Stable: Amphisol K is stable at room temperature and can withstand high temperatures during processing.
In Formulation:
INCI Name: Potassium Cetyl Phosphate.
Appearance: Typically a white to beige powder.
Disperses in: Hot water.
Recommended Use Levels: 1-2% as a primary emulsifier, or 0.5% as a secondary emulsifier or to stabilize unstable formulations.
pH: 6.5 – 8.5.
Processing: Neutralizing agents and temperature-sensitive ingredients should be added below 40°C. A second homogenization step at this temperature is recommended.
Ripening: Formulations need 24-48 hours to fully develop their structure and final viscosity.
Other Applications:
While particularly popular in sunscreens, Amphisol K is also used in other cosmetic products like:
Skincare formulations.
Make-up.
Acne treatments, anti-ageing creams, eye creams, facial cleansers, foundations, and mascara.