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Moumoujus

BUTYL BENZOATE.

Optional CAS 136-60-7 / FRAGRANCE, PRESERVATIVE

A synthetic ester that functions as a multitasking ingredient, primarily serving as a fragrance fixative and antimicrobial preservative in skincare formulations. This oil-soluble compound demonstrates notable skin penetration capabilities compared to longer-chain benzoates, making it effective at regulated concentrations. Its dual role as both a functional ingredient and fragrance component provides formulation versatility while maintaining product stability.

Summary

fragrance preservative solvent

Science

Mechanism of Action

Functions through antimicrobial disruption of bacterial cell membranes while simultaneously acidifying cellular cytoplasm to induce cell lysis. Additionally acts as an effective solvent system that enhances the stability and solubility of fragrance compounds and oil-phase actives within formulations.

Research

Clinical Evidence

High confidence
Effective range 0.5–0.5%
Optimal

0.5%

Key findings

  1. 01 EU regulatory assessment confirmed safety at 0.5% concentration in leave-on products with minimal sensitization risk
  2. 02 Penetration studies demonstrate higher dermal absorption rates compared to C12-15 alkyl benzoates
  3. 03 Safety evaluation at 100% concentration showed significant irritation potential, validating concentration limits

Transparency

Dusting Analysis

Not commonly dusted

Regulatory concentration limits are clearly established at 0.5% for leave-on products, making dusting unlikely due to strict compliance requirements.

The Formula

Formulation

Solubility
Oil
Optimal pH 3 – 7
0 7 14

Stability

Demonstrates excellent stability within acidic to neutral pH ranges, with optimal performance at pH 4.0-4.5. Undergoes ester bond hydrolysis when exposed to alkaline conditions above pH 7.0, converting to benzoic acid and butanol.

Synergies

  • Oil-phase active ingredients
  • Fragrance compounds requiring stabilization

Conflicts

  • Strong alkaline environments
  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
0.5%
Sensitization risk Low

Maximum 0.5% concentration applies to leave-on products as calculated benzoic acid equivalent per EU regulations. FDA recognition as indirect food additive supports safety profile.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

A functionally effective ingredient for fragrance stabilization and preservation, though not essential for basic skincare efficacy.

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