Stearoxymethicone/Dimethicone Copolymer

What is Stearoxymethicone/Dimethicone Copolymer?

Stearoxymethicone/Dimethicone Copolymer is a hybrid synthetic polymer blending dimethicone, a flexible silicone chain, with stearoxy groups from stearic acid for added emollience. This structure creates a lightweight, breathable film on skin surfaces. Primarily featured in moisturizers, serums, primers, and sunscreens, it excels in personal care formulations needing smooth application and stability. It works by coating skin to promote even spreading, reduce tackiness, and support emulsion integrity during use. The fatty stearoxy component mimics natural oils for better compatibility, while the silicone backbone delivers a silky, non-sticky finish that aids in product layering without residue buildup.

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:

Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
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.

Benefits

Provides a smooth, soft feel by conditioning the skin surface.

Enhances formula thickness for better stability and easy spreading.

Forms a light barrier that supports skin hydration retention.

Who It's For

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

Who May Benefit Who Should Avoid
People with dry or rough skin seeking softness.
Individuals with rare silicone sensitivities.
Those preferring non-greasy textures in daily products.
People preferring silicone-free or natural-only routines.
Users wanting stable, easy-to-apply formulations.
Those experiencing contact dermatitis to similar polymers.

Safety Notes

  • Consistently low hazard rating from safety assessments.
  • Non-comedogenic, suitable for pore-conscious routines.

Frequently Asked Questions about Stearoxymethicone/Dimethicone Copolymer

What role does it play in skincare?

Acts as a skin conditioner and viscosity adjuster for smoother, stable products.

Is it suitable for acne-prone skin?

Yes, with a zero comedogenic rating, it avoids pore blockage.

Does it cause irritation?

Generally low irritation potential from safety reviews.