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C18-22 ALKYL PEG-25 METHACRYLATE.

Valuable / NOT REPORTED

A high-performance associative monomer used to architect stable, sophisticated textures in precision skincare. It excels at anchoring oil and water phases together, ensuring that even the most volatile active ingredients remain uniform and effective throughout a product's shelf life.

emulsion stabilising surfactant viscosity controlling

Science

It functions as a structural stabilizer by utilizing long-chain 'anchors' that lock into oil droplets while its water-loving PEG-25 segments create a protective, 3D network. This microscopic scaffolding prevents ingredients from separating and maintains a consistent viscosity, even when exposed to salts or varying oil levels.


Research

High confidence
Effective range 0.01–5%
Optimal

3%

Key findings

  1. 01 Demonstrated ability to prevent the oxidation and discoloration of unstable actives like Vitamin C in emulsion systems.
  2. 02 Shown to maintain structural integrity and viscosity in formulations containing up to 80% oil content.

Transparency

Not commonly dusted
Min. effective
0.01%
Red flag below
0.5%

Because this ingredient is effective at extremely low concentrations (as low as 0.01%) for stabilization, its presence at the bottom of an INCI list is often functional rather than 'dusting.' However, for active texture-building, levels above 1% are expected.


The Formula

Solubility
Both
Optimal pH 4 – 9
0 7 14

Stability

Highly resilient to electrolytes and salts, making it a superior alternative to standard carbomers in complex ionic formulas.

Synergies

  • L-Ascorbic Acid
  • Diethylaminoethyl Methacrylate Copolymer
  • Lipid-rich oil phases

Conflicts

  • High concentrations of anionic surfactants
  • Strong oxidizing agents

Safety

CIR Status
Not reviewed
Max tested
5%
Pregnancy
Safe
Sensitization risk Low

While this specific monomer is awaiting a standalone CIR review, its chemical parent classes are established as safe for cosmetic use with a focus on keeping residual monomers below strict toxicological limits.


Your Skin

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

Our Assessment

Valuable

An essential stabilizer for high-potency serums and sophisticated emulsions that require electrolyte resistance and active ingredient protection.


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