Isostearyl Polyglyceryl (Emulsifier)

Isostearyl Polyglyceryl – Non-Ionic Emulsifier and Surfactant for Cosmetics, Personal Care, and Lubricants

Basic Information

• INCI Name: Polyglyceryl Isostearate (varies by degree of polymerization)

• CAS Number: 66082-42-6 (general for polyglyceryl isostearates; specific grade may vary)

• Synonyms: Isostearyl polyglycerin ether, Polyglyceryl isostearate

• Appearance: Pale yellow to amber viscous liquid or waxy solid

• HLB Value: Low to medium (depending on degree of esterification; suitable for W/O and O/W emulsions)

• Solubility: Soluble in oils and organic solvents; dispersible in water

• Storage: Store in tightly sealed containers in a cool, dry place, protected from light and moisture

Overview
Isostearyl polyglyceryl is a non-ionic surfactant produced by the esterification of polyglycerin (a mixture of glycerol oligomers) with isostearic acid. Depending on the reaction conditions, the number of substituted hydroxyl groups can vary, allowing for control over molecular weight and the degree of lipophilicity of the final product. This amphiphilic compound provides excellent emulsifying, dispersing, and stabilizing properties, making it a versatile ingredient in cosmetic, personal care, pharmaceutical, and lubricant formulations.

Key Properties

• Non-ionic – compatible with a wide range of ingredients and pH levels.

• Amphiphilic – reduces interfacial tension, stabilizing both W/O and O/W emulsions.

• Good skin compatibility and mildness – suitable for sensitive skin.

• Emollient properties – provides soft conditioning and moisturization.

• Modifiable structure – degree of esterification can be tailored for specific applications.

• Excellent spreading – enhances product application and skin feel.

• Biocompatible and low toxicity – safe for topical applications.

• Biodegradable and derived from renewable plant-based sources.

Applications

• Cosmetics and personal care: Used as a primary or co-emulsifier, emollient, thickener, and stabilizer in W/O and O/W creams, lotions, serums, sunscreens, makeup removers, lip cosmetics, and hair care products. Provides stable, elegant textures with good spreadability and moisturizing properties.

• Pharmaceuticals: Employed as an emulsifier, solubilizer, and penetration enhancer in topical ointments, creams, and suppositories.

• Lubricants: Used to optimize rheological properties in specialty lubricant formulations.

• Industrial: Applied as a dispersant, lubricant, and stabilizer in specialty chemical formulations.

Key Benefits

• Effective emulsification for both O/W and W/O systems.

• Mild and non-irritating – suitable for sensitive skin and baby products.

• Emollient properties – softens and conditions skin and hair.

• Excellent spreading and moisturization.

• Biocompatible, biodegradable, and of natural origin.

• Compatible with a wide range of cosmetic, pharmaceutical, and industrial ingredients.

• Acts as a co-emulsifier, thickener, and stabilizer in complex formulations.

• Modifiable structure allows for tailored performance.

Recommended Use
Typical usage levels range from 1–5% of the formulation, depending on the desired emulsion stability, viscosity, and texture. For optimal performance, dissolve in the oil phase at elevated temperatures (60–70°C) before emulsification. Can be combined with co-emulsifiers and thickeners for tailored rheology.

Safety and Handling

• Generally recognized as safe for use in cosmetics and personal care at recommended concentrations.

• Low irritation potential; well-tolerated by skin and mucous membranes.

• Avoid contact with strong oxidizers and acids.

• Store in a cool, dry place, away from direct sunlight.

• Use appropriate personal protective equipment (gloves, safety goggles) when handling.

Quality Assurance
Each batch is tested for acid value, saponification value, and emulsification performance to ensure consistent quality.