Fragrance
HEXAHYDRO-TETRAMETHYL-METHANONAPHTHALENE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A saturated polycyclic hydrocarbon used for woody-musky fragrance effects. Low reactivity but thin public cosmetic data.
Hexahydro-tetramethyl-methanonaphthalene (CAS 1135-66-6, also known as isolongifolene) is a tricyclic sesquiterpene hydrocarbon used in perfumery for woody, musky, amber notes. Fully saturated hydrocarbons of this class have low inherent reactivity (no aldehyde, phenolic, or nitrile functionality) and correspondingly mild irritation and sensitization profiles. Public SCCS/CIR specific monographs are limited; RIFM/IFRA cover industry use. Lipophilic hydrocarbons raise bioaccumulation considerations in environmental contexts but are not specific cosmetic safety concerns at normal use. Upper-yellow placement reflects solid structural chemistry tempered by data sparsity.
Function
Skin benefits
- Woody-musky fragrance note
- Fixative
- Low-reactivity saturated structure
Known concerns
- Limited public data
- Environmental bioaccumulation class considerations
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related fragrances
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.