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ACRYLIC RESIN COATED ALUMINUM POWDER.

Valuable / COLORANT

ACRYLIC RESIN COATED ALUMINUM POWDER is an advanced cosmetic ingredient functioning as a colorant and effect pigment, designed to impart white, metallic, or pearlescent finishes. The integrated acrylic resin coating significantly enhances dispersion and moderates the reactivity of the aluminum, while also contributing to the formation of a sebum-insensitive, elastic, and resilient film on the skin.

Summary

colorant film former texture enhancer

Science

Mechanism of Action

Operating primarily as an optical modulator, Acrylic Resin Coated Aluminum Powder delivers desired aesthetic effects such as white, metallic, or pearlescent finishes within cosmetic formulations. The acrylic resin strategically coats the aluminum powder, critically improving its dispersion, mitigating its inherent reactivity, and imparting film-forming and texturizing capabilities. This polymeric layer, known for its elasticity and resilience, also creates a sebum-insensitive film upon application to the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Acrylic resins generally exhibit robust thermal stability and resistance to UV and environmental weathering. The coating facilitates the dispersion of the inherently insoluble aluminum powder within oil-based systems and moderates its reactivity. Formulators must consider potential adhesion issues or delamination caused by components such as alcohols, phenol/hydroxyl group-containing compounds, or other low molecular weight substances, which may also be absorbed by the film and impact product quality.

Conflicts

  • Water (can react with uncoated aluminum to generate hydrogen gas and heat)
  • Metal oxides
  • Metal salts
  • Mercury and mercury compounds
  • Nitrates
  • Sulfates
  • Halogens
  • Halogenated hydrocarbons
  • Powdered ammonium persulfate and water (potential for explosion)
  • Bismuth trioxide (explosively violent reaction when heated)
  • Finely divided bromates (and chlorates, iodates) of barium, calcium, magnesium, potassium, sodium, or zinc (potential for explosion by heat, percussion, friction)
  • Vapors of carbon disulfide, sulfur dioxide, sulfur dichloride, nitrous oxide, nitric oxide, or nitrogen peroxide (burns in these vapors)
  • Carbon tetrachloride (exploded when heated or by impact)

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The FDA classifies Aluminum Powder as a color additive safe for external cosmetic use, including the eye area, but explicitly excludes lip products. The CIR Expert Panel, recognizing the FDA's existing assessment, deferred its own evaluation. General aluminum compounds exhibit a favorable toxicological profile, very low dermal absorption (approximately 0.00052%), and are not typically associated with irritation or allergic reactions. The acrylic resin coating is anticipated to further enhance this safety profile by minimizing direct contact of the aluminum powder with the skin.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

This ingredient is a valuable cosmetic colorant and film former, providing metallic and pearlescent effects with a favorable safety profile due to its protective acrylic resin coating and low risk of irritation.

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