Hydrogenated Butylene/Ethylene/Styrene Copolymer

What is Hydrogenated Butylene/Ethylene/Styrene Copolymer?

Hydrogenated Butylene/Ethylene/Styrene Copolymer is a synthetic hydrocarbon polymer created by hydrogenating a copolymer of butylene, ethylene, and styrene monomers. This process improves stability and reduces unsaturation. Primarily found in anhydrous or oil-based formulations like lip products, mascaras, and clear gels, it functions by increasing viscosity in non-water systems, forming flexible films on skin or hair, and providing a smooth, non-sticky texture. As an emollient, it lubricates the skin surface; as a skin conditioner, it supports suppleness. Its gel-like properties allow for transparent, thixotropic structures that suspend pigments and improve application ease without greasiness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Improves formula thickness for better stability and even dispensing in oil-based products.

Softens skin by filling surface irregularities and aiding moisture retention.

Enhances skin smoothness and flexibility with its conditioning effects.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking stable, gel-textured makeup or hair products.
Those with rare sensitivities to styrene-based polymers.
People with dry or rough skin desiring emollient benefits.
Individuals preferring only natural or plant-derived ingredients.
Users preferring lightweight, non-greasy formulations.
People experiencing irritation from synthetic film-formers, though uncommon.

Safety Notes

  • Considered low hazard with no significant irritation or sensitization risks in cosmetic use.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Hydrogenated Butylene/Ethylene/Styrene Copolymer

Is Hydrogenated Butylene/Ethylene/Styrene Copolymer safe for skin?

Yes, it is regarded as safe with low hazard ratings and minimal irritation potential in cosmetics.

Does it clog pores?

No, it has a comedogenic rating of zero, suitable for acne-prone skin.

What products contain it?

Commonly used in anhydrous formulas like lipsticks, mascaras, and clear gels for texture.