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Moumoujus

DIPHENYL ETHER.

Avoid CAS 101-84-8 / FRAGRANCE

Diphenyl Ether is an aromatic compound primarily utilized in skincare as a fragrance ingredient, contributing a floral, geranium-like scent to formulations. It also possesses solvent properties, aiding in the dissolution of other components.

Summary

Masking Solvent

Science

Mechanism of Action

This ingredient primarily functions as a masking agent, imparting a desirable aroma to products to obscure less pleasant odors and enhance the sensory experience. Its secondary role as a solvent facilitates the dispersion and stability of other ingredients within a formulation.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A dermal subchronic toxicity study in rats revealed skin irritation reactions at the application site across all tested concentrations, including 0.5%, 5%, and 50%. While a systemic no-observed-adverse-effect level (NOAEL) for dermal application was determined to be 1000 mg/kg body weight/day, localized skin irritation was a consistent observation even at the lowest concentration of 0.5%.

Transparency

Dusting Analysis

Not commonly dusted

Diphenyl Ether is not typically promoted for active skincare benefits; thus, it is not subject to 'dusting' claims. However, its documented capacity to induce skin irritation at concentrations as low as 0.5% in animal studies represents a significant red flag, rendering its inclusion questionable in precision skincare formulations.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Diphenyl Ether demonstrates stability at elevated temperatures and exhibits increased stability in alkaline environments.

Conflicts

  • Oxidizing materials
  • Strong acids (can lead to reactions such as hydroxylation, halogenation, nitration, Friedel-Crafts alkylation, and sulfonation)
  • Hydrophilic liquids (due to immiscibility)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel has not conducted a specific review of Diphenyl Ether. However, the Research Institute for Fragrance Materials (RIFM) found skin irritation at all concentrations tested in a dermal subchronic toxicity study in rats, including a 0.5% concentration. It is generally classified as irritating to the skin and eyes, with potential for dermatitis from repeated or prolonged contact. The EWG classifies it as expected to be toxic or harmful.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Given the documented skin irritation observed at concentrations as low as 0.5% in animal studies and its primary function as a fragrance without clear topical benefits, Diphenyl Ether is deemed unsuitable for inclusion in precision skincare formulations.

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