C30-45 Alkyl Cetearyl Dimethicone Crosspolymer

What is C30-45 Alkyl Cetearyl Dimethicone Crosspolymer?

C30-45 Alkyl Cetearyl Dimethicone Crosspolymer is a synthetic, high-molecular-weight silicone polymer created by crosslinking dimethicone with long-chain C30-45 alkyl groups and cetearyl moieties. Primarily used in cosmetic formulations like creams, lotions, sunscreens, and hair products, it acts as a multifunctional ingredient. It thickens emulsions, stabilizes mixtures, and modifies texture for better spreadability. Upon application, it forms a thin, flexible film on skin or hair, which enhances water repellency, reduces friction, and provides a non-greasy, velvety finish. This crosspolymer improves product aesthetics and performance without heavy occlusion, allowing skin to breathe while minimizing moisture evaporation. Its alkyl modification boosts compatibility with oils and pigments, making it ideal for makeup and protective barriers.

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:

Film former

Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.

Hair conditioning

Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.

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

Creates a breathable film that boosts water resistance and product longevity on skin or hair.

Enhances softness and slip, reducing friction for easier styling and application.

Smooths surface irregularities, improving overall texture and manageability.

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 improved makeup wear and transfer resistance.	Those with rare silicone sensitivities.
People with dry or rough skin or hair wanting added smoothness.	People preferring silicone-free formulations.
Users of water-resistant sunscreens or styling products for better hold.	Individuals experiencing issues with film-forming agents.

Safety Notes

Considered safe for cosmetic use with low hazard potential.
Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about C30-45 Alkyl Cetearyl Dimethicone Crosspolymer

What does this ingredient do in products?

It forms protective films, conditions skin and hair, and acts as an emollient for smoother textures.

Is it safe for daily use?

Yes, it has a low safety rating and is non-comedogenic for most users.

Does it cause irritation?

Typically low irritation potential based on cosmetic safety reviews.