Naphthalene (Crude & Refined)

Naphthalene (Crude & Refined)

CAS Number:91‑20‑3

Chemical Formula:C₁₀H₈

Product Introduction

A white, aromatic polycyclic hydrocarbon derived from coal tar or petroleum—present both in crude (~95% purity) and refined (>99%) grades, featuring sharp mothball-like odor. Refined grade is widely used in resins, plasticizers, surfactants, dyes, coatings, and fumigation.

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Physical & Chemical Properties

Property Crude (≈95%) Refined (>99%)
Appearance White crystalline flakes White/pale flakes or powder
Melting Point ~79–83 °C 80–82 °C
Boiling Point ~218 °C Same
Density (bulk) ~0.99 g/cm³; 550–600 mg/m³ fumes 1.145 g/cm³ (solid)
Solubility in Water ~30 mg/L @25 °C Same
Vapor Pressure ~0.03 mmHg @25 °C Same
Odor Threshold ~0.08 ppm detectable Same
Log P 3.7 Same
NFPA (H/F/R) 2 / 2 / 0 Same

Applications

  • Crude:feedstock for phthalic anhydride, β-naphthol, surfactants, dyes, coatings, antimicrobials
  • Refined:moth repellents, plasticizers, synthetic resins, and specialty uses in fumigation and coatings

Safety & Handling

  • Flammable solid (UN 1334, Class 4.1 PG III); moderate toxicity, possible carcinogen (IARC 2B)
  • TLV–TWA: 10 ppm; STEL: 15 ppm; IDLH: 500 ppm
  • Store below 30 °C in a cool, ventilated area; control dust and fume exposure

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