MSDS Naphthalene (C10H8) – Safety Data Sheet & GHS Hazards

Summary MSDS for Naphthalene (C10H8), CAS 91-20-3: substance identity, GHS hazard classification, hazard and precautionary statements, and links to the manufacturer's official SDS.

Identity summary

Name	Naphthalene
Other names (IUPAC)	–
Molecular formula	C10H8
CAS number	91-20-3
Molar mass	128.17 g/mol
PubChem CID	931

Molar mass of C10H8 and how to calculate it

The molar mass of C10H8 is 128.17 g/mol, the sum of the relative atomic masses of all atoms in the formula: 10 × 12.011 + 8 × 1.008 = 128.17 g/mol.

Element	Atoms	Atomic mass	Contribution	Mass %
C	10	12.011	120.11	93.71%
H	8	1.008	8.06	6.29%

So 1 mol of C10H8 weighs 128.17 g, and 1 L of a 0.1 M solution needs 12.817 g of pure C10H8. For liquid or concentrated reagents, work from assay and density with the dilution formula. Calculate other compounds with the molar mass calculator.

Hazard identification (GHS)

Signal word: DANGER

Pictograms:

Meaning of all GHS hazard symbols

Hazard statements (H)

• H302: Harmful if swallowed.
• H320: Causes eye irritation.
• H370: Causes damage to organs.
• H372: Causes damage to organs through prolonged or repeated exposure.
• H317: May cause an allergic skin reaction.
• H351: Suspected of causing cancer.
• H410: Very toxic to aquatic life with long lasting effects.
• H228: Flammable solid.

Precautionary statements (P)

Prevention

• P273: Avoid release to the environment.
• P272: Contaminated work clothing should not be allowed out of the workplace.
• P260: Do not breathe dust.
• P270: Do not eat, drink or smoke when using this product.
• P202: Do not handle until all safety precautions have been read and understood.
• P240: Ground and bond container and receiving equipment.
• P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
• P201: Obtain special instructions before use.
• P241: Use explosion-proof electrical/ ventilating/ lighting/ equipment.
• P264: Wash skin thoroughly after handling.
• P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.

Response

• P302 + P352: IF ON SKIN: Wash with plenty of water.
• P370 + P378: In case of fire: Use dry sand, dry chemical or alcohol-resistant foam to extinguish.
• P391: Collect spillage.
• P337 + P313: If eye irritation persists: Get medical advice/ attention.
• P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
• P308 + P311: IF exposed or concerned: Call a POISON CENTER/doctor.
• P362 + P364: Take off contaminated clothing and wash it before reuse.
• P333 + P313: If skin irritation or rash occurs: Get medical advice/ attention.
• P301 + P312 + P330: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. Rinse mouth.

Storage

• P405: Store locked up.

Disposal

• P501: Dispose of contents/ container to an approved waste disposal plant.

The GHS classification above matches TCI (Tokyo Chemical Industry) official data for product N0885 Naphthalene. Substance identity from PubChem CID 931.

Download the official SDS & CoA

The applicable Safety Data Sheet is the manufacturer's SDS for the product and lot you purchase. For products available from AMI Scientific:

TCI N0885 – Naphthalene	Official SDS & CoA (TCI)
TCI N0885 – Naphthalene	View product

SDS and lot-specific CoA are sent with the quotation/order or on request.

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What is an MSDS/SDS?

An MSDS (Material Safety Data Sheet), now called an SDS (Safety Data Sheet), is a 16-section document describing the hazards, handling, storage, first aid, and disposal of a chemical. Read the full MSDS guide and other MSDS pages.

This summary was compiled by AMI Scientific from TCI official GHS data for information purposes. Classification may differ by concentration, form, and supplier. Always refer to the manufacturer's official SDS for the product and lot you use. Updated: 06-11-2026.