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CARBOXYMETHYL HYDROXYETHYLCELLULOSE.

Valuable CAS 9088-04-4 / BINDING, EMULSION STABILISING, FILM FORMING, VISCOSITY CONTROLLING

A versatile cellulose-derived polymer that serves as a sophisticated rheology modifier and skin-conditioning agent. It bridges the gap between texture enhancement and hydration by creating a weightless, breathable shield on the skin surface.

viscosity controlling film forming binding emulsion stabilising

Science

This ingredient utilizes a dual-functional molecular structure, combining anionic and non-ionic groups to stabilize complex emulsions. On the skin, it forms a cohesive, semi-permeable film that significantly inhibits trans-epidermal water loss (TEWL) while optimizing the glide and delivery of active ingredients.


Research

High confidence
Effective range 0.3–39%
Optimal

0.35%

Key findings

  1. 01 Safety assessments by the CIR Expert Panel confirmed that concentrations up to 39% in rinse-off products are non-sensitizing.
  2. 02 Ocular and dermal testing at 100% concentration demonstrated that the material is non-irritating to slightly irritating, proving a high degree of biocompatibility.
  3. 03 Technical patents indicate that concentrations as low as 0.3% effectively optimize viscosity and skin comfort in friction-heavy applications like shaving.

Transparency

Not commonly dusted
Min. effective
0.3%
Red flag below
0.1%

Because it is functional at very low levels (under 0.5%) for texture and stability, it is rarely 'dusted' for marketing purposes; its presence usually indicates a deliberate formulation choice for product performance.


The Formula

Solubility
Water
Optimal pH 5.5 – 7
0 7 14

Stability

While chemically stable across a broad pH range of 3.0 to 11.0, its viscosity and integrity are best maintained within the skin-neutral range of 5.5 to 7.0.

Synergies

  • Humectants
  • Lipid-based emollients
  • Sunscreen filters

Conflicts

  • Strongly alkaline components
  • Strong oxidizing agents
  • High concentrations of trivalent salts

Safety

CIR Status
Safe as used
Max tested
39%
Pregnancy
Safe
Sensitization risk Low

Recognized as GRAS (Generally Recognized As Safe) by the FDA for food use, emphasizing its systemic safety profile. It is non-mutagenic and non-photosensitizing.


Your Skin

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

Our Assessment

Valuable

An exceptionally safe and reliable structural polymer that enhances both the sensory elegance and the moisture-retention capabilities of advanced skincare formulations.


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