Polyglyceryl-20 octaisononanoate is a chemical compound, the octaester of isononanoic acid and Polyglycerin-20 produced by the reaction between 20 units of glycerin and octaisononanoic acid.
It appears as a solid or semi-solid, liquid or semi-liquid waxy substance. It has a relatively high melting point, which enables it to retain its solid form at room temperature or slightly higher temperatures.

What it is used for and where
Cosmetics
Surfactant - Cleansing agent. Cosmetic products used to cleanse the skin utilise the surface-active action that produces a lowering of the surface tension of the stratum corneum, facilitating the removal of dirt and impurities.
Surfactant - Emulsifying agent. Emulsions are thermodynamically unstable. Emulsifiers have the property to reduce the oil/water or water/oil interfacial tension, improve emulsion stability and also directly influence the stability, sensory properties and surface tension of sunscreens by modulating their filmometric performance.
Surfactant - Solubilising agent. Solubilisation facilitates the diffusion and transport of many cosmetic ingredients, even in the form of microemulsions, on the stratum corneum, improving the effectiveness of formulations.
Its main function is to help create and stabilise oil-in-water emulsions, where it enables the mixing and even distribution of oil- and water-based ingredients and enables the formation and maintenance of stable emulsions, ensuring that the oil and water components of a product do not separate. This helps improve the consistency and texture of formulations, providing a smooth and homogenous product.
Safety
The EFSA Panel on the Safety of Cosmetic Ingredients considered that this ingredient is safe in cosmetics in current use practices and in the concentrations described in this safety assessment, when formulated in a non-irritant way. (1).