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2,4-DIMETHYL-2-(5,6,7,8-TETRAHYDRO-3,5,5,6,8,8-HEXAMETHYL-2-NAPHTHALENYL)-1,3-DIOXOLANE.

Optional CAS 131812-48-1 / PERFUMING

A synthetic aromatic compound that functions exclusively as a fragrance component in skincare formulations, delivering woody-ambery scent notes with exceptional longevity. Known commercially as Okoumal, this ingredient exhibits remarkable substantivity, maintaining its olfactory presence on skin for extended periods without contributing active skincare benefits.

perfuming masking

Science

Operates purely through olfactory interaction, adhering to skin surfaces via high molecular substantivity to provide long-lasting fragrance base notes, with no documented dermatological activity despite structural similarities to certain retinoid compounds.


Research

Low confidence
Effective range 0.5–4%
Optimal

N/A


Transparency

Not commonly dusted

Primarily used for fragrance masking rather than active benefits, making dusting practices less relevant for this ingredient.


The Formula

Solubility
Oil
Optimal pH 3 – 11
0 7 14

Stability

Demonstrates exceptional stability across broad pH ranges, performing optimally in formulations between pH 3-11, with reduced stability in extreme acidic conditions below pH 2 and oxidative environments.

Conflicts

  • Strong oxidizing agents
  • Liquid bleach
  • Concentrated inorganic acids

Safety

CIR Status
Not reviewed
Max tested
4%
Sensitization risk Low

Industry-approved for cosmetic use with low acute toxicity profile (LD50 > 2000 mg/kg) and no IFRA restrictions at standard concentrations, though formal CIR assessment remains pending.


Your Skin

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

Our Assessment

Optional

A stable, low-irritancy fragrance ingredient that serves purely aesthetic purposes without contributing measurable skincare benefits.


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