Bis-PEG-18 Methyl Ether Dimethyl Silane

PEG / Ethoxylated
Benefits
Hair ConditioningSoftening

What is Bis-PEG-18 Methyl Ether Dimethyl Silane?

Bis-PEG-18 Methyl Ether Dimethyl Silane is a lab-made hybrid of silicone and polyethylene glycol, where PEG chains are grafted onto a methyl ether dimethyl silane core. This structure combines silicone's smooth feel with water-loving properties, making it ideal for rinse-off hair and skin products like shampoos, conditioners, body washes, and micellar waters. It works by reducing surface tension to mix oils into water, creating stable emulsions and clear formulas. It also generates rich, creamy foam, dissolves hard-to-mix ingredients like scents, draws moisture to skin and hair surfaces, and leaves a silky, non-greasy film that enhances slip and manageability during application and rinse-off. Its lightweight nature suits frequent-use cleansing systems without buildup.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 3 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.
Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Foam booster
Enhances foam volume and creaminess and can stabilize lather, improving sensory feel and perceived cleansing in shampoos and wash-off products.
Hydrotrope
Improves solubility of poorly soluble ingredients (like fragrances) in water-based systems, helping maintain clarity and prevent separation or cloudiness.
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.
Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Enhances hair conditioning for improved softness and shine.

Softens skin as an emollient while aiding moisture retention.

Boosts foam quality and stabilizes cleansers for better texture.

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 frizzy hair seeking lightweight conditioning.
Those sensitive to PEG compounds.
Individuals wanting hydrating, non-greasy cleansers.
People preferring silicone-free or fully natural products.
Users preferring clear, high-foam shampoos and body washes.
Individuals with rare silicone allergies.

Safety Notes

  • Rated moderate concern by EWG due to potential impurities from ethoxylation.
  • Non-comedogenic and suitable for most skin types in rinse-off uses.

Frequently Asked Questions about Bis-PEG-18 Methyl Ether Dimethyl Silane

What does it do in shampoos?

Boosts foam, conditions hair for softness, and solubilizes fragrances for clear formulas.

Is it safe for daily use?

Generally safe in rinse-off products at typical levels, with low comedogenic risk.

Does it hydrate skin?

Functions as a humectant to attract water, paired with emollient effects for smoothness.