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CELLULOSE ACETATE PROPIONATE.

Valuable CAS 9004-39-1 / FILM FORMING

Cellulose Acetate Propionate is a functional film-former and binder extensively used in skincare and cosmetics. It enhances product texture, adhesion, and stability while ensuring a non-yellowing finish.

Summary

film forming binder

Science

Mechanism of Action

On the skin, Cellulose Acetate Propionate functions primarily as a film-former and binder. This molecular action contributes to improved formulation properties, including increased resistance to blocking, enhanced adhesion to the skin, and rapid solvent release. It also helps maintain product integrity by exhibiting non-yellowing characteristics.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 The CIR Expert Panel found Cellulose Acetate Propionate to be nonirritating to mildly irritating, nonsensitizing, and nonphotosensitizing to the skin when tested at concentrations up to 100%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Propionate grades with higher hydroxyl content dissolve well in alcohol and water mixtures. It is soluble in various organic solvents, including ketones (e.g., acetone) and esters, and demonstrates good water tolerance. The ingredient exhibits robust thermal stability up to 300°C.

Conflicts

  • Acetone (dissolves/softens)
  • Sodium hydroxide (10%) (disintegrates)
  • Malathion (50% spray diluted) (softens, swells, surface pits, cloudy when wet)
  • Vicks Sinex™ (50°C) (badly deteriorates/softens)
  • Toluene (softens, swells)
  • Xylene (softens, swells)
  • Acetic acid (5%) (slightly softens)
  • Some ionic liquids at high concentrations (incompatibility leading to domain formation)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
100%
Sensitization risk Low

The CIR Expert Panel concluded that Cellulose Acetate Propionate is safe for cosmetic use, based on studies showing it to be nonirritating to mildly irritating, nonsensitizing, and nonphotosensitizing to the skin at concentrations up to 100%. It is also approved for use in the European Union and listed by the FDA as an indirect food additive.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

A safe and versatile film-former and binder, Cellulose Acetate Propionate enhances cosmetic textures and performance across all skin types with a very low risk of irritation or sensitization.

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