Amodimethicone/Silsesquioxane Copolymer

What is Amodimethicone/Silsesquioxane Copolymer?

Amodimethicone/Silsesquioxane Copolymer is a synthetic hybrid silicone ingredient, blending amino-modified dimethicone (amodimethicone) with silsesquioxane structures—rigid, cage-like polyhedral oligomers. Developed for performance in cosmetics, it belongs to the silicone polymer family tailored for haircare formulations like conditioners, serums, sprays, and styling aids. In products, it works by adsorbing onto the hair surface, creating a flexible, breathable film that coats individual strands. This deposition reduces friction between hairs, enhances slip for easier combing, imparts a smooth texture, boosts light reflection for shine, and offers humidity-resistant hold without stiffness. Its dual nature combines the conditioning softness of amodimethicone with the durability of silsesquioxane for long-lasting effects and wash-off ease.

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.

Hair fixative

Provides style hold by forming a film on hair, helping maintain shape, reduce frizz, and improve durability in sprays, gels, and mousses.

Hair fixing

Improves style retention by depositing film-forming polymers that hold hair in place while balancing stiffness, flexibility, and humidity resistance.

Benefits

Provides lasting smoothness and shine by forming a protective layer on hair.

Improves manageability and reduces frizz for easier styling.

Enhances style retention and water resistance in hair products.

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 with dry or damaged hair seeking better conditioning.	Users with rare silicone sensitivities or allergies.
People needing humidity-resistant style hold in daily routines.	People preferring silicone-free products for buildup concerns.
Those preferring lightweight shine without heavy residue.	Those experiencing contact dermatitis from haircare polymers.

Safety Notes

Rated low hazard by environmental health assessments.
Generally well-tolerated in rinse-off and leave-on hair products.

Frequently Asked Questions about Amodimethicone/Silsesquioxane Copolymer

What does it do in hair products?

Forms a film on hair to boost conditioning, shine, manageability, and style hold.

Is it safe for sensitive scalps?

Typically low irritation potential in cosmetic use concentrations.

Does it work on all hair types?

Effective across types, especially for smoothing frizz and adding durability.