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ALUMINUM HYDROXY BIS-METHYLENE BIS-DI-T-BUTYLPHENYL PHOSPHATE.

Questionable CAS 151841-65-5 / SKIN CONDITIONING

This heat-stable, oil-soluble compound recently transitioned from an industrial polymer additive to a cosmetic skin-conditioning and stabilizing agent.

Skin conditioning Viscosity increasing (nonaqueous) Stabilizer

Science

In skincare, it likely functions as a physical stabilizer or film-former. Industrially, it acts as a nucleating agent, influencing polymer crystallization.


Research

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Primarily used in cosmetics for high thermal stability and as a specialized skin-conditioning agent, despite its main role in plastics for stiffening effects.
  2. 02 A cytotoxicity study on Chinese hamster ovary cells revealed increased nuclear intensity and reduced mitochondrial mass after 48h exposure to leached concentrations (0.005 - 0.25 μg/ml).

Transparency

Not commonly dusted

The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Highly heat-stable (melting point >210°C) but hygroscopic, requiring dry storage under nitrogen. It is practically insoluble in water.

Conflicts

  • Water-based systems (due to very low solubility)
  • Strong oxidizing agents

Safety

CIR Status
Not reviewed
Sensitization risk Low

The FDA lists it as an indirect food additive. ECHA classifies it as toxic to aquatic life (Aquatic Chronic 2).


Your Skin

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

Our Assessment

Questionable

Despite its role as a skin conditioning agent with low reported irritancy, significant in vitro cytotoxicity at low concentrations and unreviewed cosmetic safety data warrant caution.


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