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2,5,5-TRIMETHYL-2-PHENYL-1,3-DIOXANE.

Optional CAS 5406-58-6 / PERFUMING

A synthetic fragrance compound that delivers floral and herbaceous scent profiles while serving as an odor-masking agent in cosmetic formulations. This acetal-structured molecule is primarily valued for its olfactory properties rather than direct skincare benefits.

Perfuming Odor masking

Science

Functions exclusively through sensory enhancement by providing pleasant fragrance notes and masking undesirable base odors in formulations, with no established biological activity for skin health improvement.


Research

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 OECD TG 428 skin absorption study at 1% showed 3.13% permeation (unoccluded) and 11.1% (occluded) over 24 hours
  2. 02 RIFM safety evaluation at 0.06% concentration in body spray applications confirmed systemic safety parameters

Transparency

Not commonly dusted

As a fragrance component with established concentration limits, dusting is not a common practice for this ingredient


The Formula

Solubility
Oil
Optimal pH 7 – 13
0 7 14

Stability

Acetal structure makes it vulnerable to hydrolytic breakdown in acidic conditions, converting to acetophenone and neopentyl glycol components

Conflicts

  • Acidic formulations below pH 6.0
  • Strong oxidizing agents

Safety

CIR Status
Not reviewed by CIR
Max tested
5%
Sensitization risk High

RIFM Expert Panel concluded safe as used in fragrance applications. ECHA classification includes Skin Sensitizer Category 1 and Eye Irritant Category 2 designations.


Your Skin

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

Our Assessment

Optional

A functional fragrance ingredient with high sensitization potential that serves sensory rather than therapeutic purposes in skincare.


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