Naphthalene
An aromatic hydrocarbon comprising two fused benzene rings. It occurs in the essential oils of numerous plant species e.g. magnolia. — ChEBI
Safety documents & references
2 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 91-20-3 | ChEBI ↗ |
| Molecular formula | C10H8 | ChEBI ↗ |
| Molar mass | 128.174 g/mol | ChEBI ↗ |
| Monoisotopic mass | 128.0626 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:16482 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 128.17 g/mol | PubChem ↗ |
| Exact mass | 128.062600255 Da | PubChem ↗ |
| Computed XLogP | 3.3 | PubChem ↗ |
| Topological polar surface area (Ų) | 0 | PubChem ↗ |
| H-bond donors | 0 | PubChem ↗ |
| H-bond acceptors | 0 | PubChem ↗ |
| Rotatable bonds | 0 | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiernaphthalenenaphthaleneUFWIBTONFRDIAS-UHFFFAOYSA-Nc1ccc2ccccc2c1InChI=1S/C10H8/c1-2-6-10-8-4-3-7-9(10)5-1/h1-8HClassification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentNaphthalene · R05-C-002-JNIOSH, MOE
| Endpoint | Reported classification |
|---|---|
| Serious eye damage/eye irritation | Category 2B |
| Hazardous to the aquatic environment （Acute） | Category 1 |
| Hazardous to the aquatic environment （Long-term） | Category 2 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 128.174 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.