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  • industrial

3,4-Dihydro-5-methylnaphthalen-1(2H)-one

CAS 6939-35-1

3,4-Dihydro-5-methylnaphthalen-1(2H)-one chemical structure

Concern score

Not assessed — no hazard data yet.

3,4-Dihydro-5-methylnaphthalen-1(2H)-one in plain language

What it is

On cosmetic ingredient lists it appears as “3,4-DIHYDRO-5-METHYLNAPHTHALENONE”.

Also known as 3,4-DIHYDRO-5-METHYLNAPHTHALENONE · 5-METHYL-1-TETRALONE · 5-Methyl-3,4-dihydronaphthalen-1(2H)-one · 5-methyl-3,4-dihydro-2H-naphthalen-1-one · 1(2H)-Naphthalenone, 3,4-dihydro-5-methyl- · 3,4-DIHYDRO-5-METHYL-1(2H)-NAPHTHALENONE

Show all 12 names

5-METHYL-1,2,3,4-TETRAHYDRONAPHTHALEN-1-ONE · 5-Methyl-3,4-dihydro-1(2H)-naphthalenone · 5-methyltetralin-1-one · MLS002667863 · UNII-A481GK7DJQ · Zybcyrggmardqi-uhfffaoysa-n

What it does

Used in cosmetics as a fragrance ingredient.

  • Perfuming
  • Fragrance
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. 3,4-Dihydro-5-methylnaphthalen-1(2H)-one appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for 3,4-Dihydro-5-methylnaphthalen-1(2H)-one. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for 3,4-Dihydro-5-methylnaphthalen-1(2H)-one yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated 2020-03-19

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Not a strong fit for fragrance avoidance because it carries Fragrance.

Avoid

The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.

Where it has been recorded

How often EPA CPDat has listed 3,4-Dihydro-5-methylnaphthalen-1(2H)-one in a product composition. These are source records, not Greenveil catalog products.

Named organisations

2

Typical roles

PerfumingFragrance
See products using 3,4-Dihydro-5-methylnaphthalen-1(2H)-one →