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PEG/PPG-8/26 DIMETHICONE.

Insufficient Data CAS - / ANTIFOAMING, PLASTICISER, SKIN CONDITIONING, SURFACTANT - CLEANSING

PEG/PPG-8/26 Dimethicone is a sophisticated silicone derivative that functions as a multi-purpose skin-conditioning agent, humectant, and emollient. It works to enhance skin hydration by forming a breathable protective film and attracting moisture, while simultaneously improving product texture and spreadability.

Summary

Emollient Humectant Skin-Conditioning Agent Emulsifying Agent Dispersing Agent Lubricant Film-Forming Agent

Science

Mechanism of Action

This ingredient operates by forming a protective, non-occlusive film on the skin's surface, characteristic of silicone derivatives, which effectively minimizes transepidermal water loss (TEWL) and thereby boosts skin hydration. As a humectant, it actively draws and retains moisture, contributing to sustained skin comfort. Beyond its hydrating properties, it acts as a lubricant, emulsifier, and dispersing agent, facilitating a remarkably smooth application and improved feel for cosmetic formulations.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Clinical investigations on the broader category of 'Dimethicone Copolyol' (an umbrella term that includes PEG/PPG-8/26 Dimethicone) indicated no primary skin irritation when tested undiluted. Further assessments at a 40% concentration in aqueous solution also confirmed its non-irritant profile. A study involving 201 volunteers concluded that Dimethicone Copolyol was non-irritating and non-sensitizing.

Transparency

Dusting Analysis

Not commonly dusted

Information regarding 'dusting' properties specific to PEG/PPG-8/26 Dimethicone is not available in the provided data.

The Formula

Formulation

Solubility
Water
Optimal pH 2.5 – 5.5
0 7 14

Stability

As an alkoxy polysiloxane with a PEG moiety, this ingredient is inherently hydrophilic and demonstrates good solubility in water and various alcohols. Its water solubility is observed to increase proportionally with the number of alkoxy groups in the polymer chain. The ingredient is generally stable, with related dimethicone copolyols showing consistent stability in formulations within a pH range of 2.5 to 5.5.

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk Low

In 2014, the Cosmetic Ingredient Review (CIR) Expert Panel issued an 'insufficient data' announcement for polyoxyalkylene siloxane copolymers, including PEG/PPG-8/26 Dimethicone. This decision was based on a lack of specific data regarding molecular weight ranges, impurities, dermal penetration, irritation, and sensitization for the smaller ingredients within this group. Prior to this, in 1982 (reaffirmed 2005), the broader category 'dimethicone copolyol' (encompassing this ingredient) was concluded to be 'safe as used'. There is no specific SCCS opinion found, and the FDA collects usage data via its Voluntary Cosmetic Registration Program (VCRP).

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Insufficient Data

While the broader class of dimethicone copolyols has a historical safety record of being 'safe as used', the CIR Expert Panel has identified insufficient specific data for PEG/PPG-8/26 Dimethicone itself, despite its beneficial skin-conditioning, humectant, and low irritancy/comedogenicity attributes identified in general assessments.

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