Naphthalene CAS#91-20-3
Important Industrial Raw Material: Naphthalene is a key basic chemical derived from coal tar processing and widely used as a raw material in dyes, plastics, coatings, pharmaceuticals, and pesticides.
High Purity and Well-Defined Physical Properties: It has a clear chemical structure (C₁₀H₈) with stable physical constants, including a melting point of 80.28°C and a density of 1.145 g/cm³, supporting reliable industrial processing.
Good Solubility in Organic Solvents: Naphthalene is readily soluble in organic solvents such as ether, alcohol, and benzene, making it suitable for a wide range of chemical synthesis applications.
Volatile and Reactive Aromatic Compound: As a sublimable aromatic hydrocarbon with strong chemical reactivity, it serves as a versatile intermediate for the production of various fine chemicals and functional materials.
Product Description of Naphthalene CAS#91-20-3
Naphthalene is the simplest fused aromatic hydrocarbon composed of two benzene rings, commonly known as “mothball” or “sanitary ball.” It is one of the primary products obtained from coal tar processing. In industry, naphthalene is available as crude naphthalene (including industrial and pressed grades) and refined naphthalene. Its molecular formula is C₁₀H₈, with a molecular weight of 128.17. It has a melting point of 80.28°C, a solid density of 1.145 g/cm³, a liquid density (at 85°C) of 0.9752 g/cm³, a specific heat capacity (at 100°C) of 1809 J/(kg·K), and a refractive index (at 85°C) of 1.5898.
Naphthalene appears as a colorless monoclinic crystalline solid. It is volatile and sublimable, has a characteristic odor, is flammable, and can form explosive mixtures with air. Its solution in petroleum ether exhibits red-purple fluorescence under mercury lamp irradiation. It is practically insoluble in water but soluble in ether, alcohol, benzene, and other organic solvents. Naphthalene vapor and dust may cause toxicity upon inhalation or skin absorption, and the maximum allowable concentration in air is 20 mg/m³. It is an important basic raw material widely used in the dye, plastics, coatings, pharmaceutical, and pesticide industries, and was historically used as a moth repellent for clothing and fur.
Parameters
| Melting point | 80-82 °C (lit.) |
| Boiling point | 218 °C (lit.) |
| density | 0.99 |
| bulk density | 550-600mg/m3 |
| vapor density | 4.4 (vs air) |
| vapor pressure | 0.03 mm Hg ( 25 °C) |
| refractive index | 1.5821 |
| Fp | 174 °F |
| storage temp. | Store below +30°C. |
| solubility | methanol: soluble50mg/mL, clear, colorless |
| form | Faint beige to brown to salmon red powder |
| color | White to almost white |
| Specific Gravity | 1.145 |
| Odor | at 10.00 % in benzyl benzoate. pungent dry tarry |
| Odor Type | pungent |
| explosive limit | 0.9-5.9%(V) |
| Water Solubility | 30 mg/L (25 ºC) |
| Merck | 146370 |
| BRN | 1421310 |
| Henry's Law Constant | 5.64 at 25 °C (thermodynamic method-GC/UV spectrophotometry, Altschuh et al., 1999) |
| Exposure limits | TLV-TWA 10 ppm （～50 mg/m3) (ACGIH, MSHA, and OSHA); STEL 15 ppm (～75 mg/m3) (ACGIH); IDLH 500 ppm. |
| Dielectric constant | 2.5（85℃） |
| InChIKey | UFWIBTONFRDIAS-UHFFFAOYSA-N |
| LogP | 3.7 at 25℃ |
| CAS DataBase Reference | 91-20-3(CAS DataBase Reference) |
| IARC | 2B (Vol. 82) 2002 |
| NIST Chemistry Reference | Naphthalene(91-20-3) |
| EPA Substance Registry System | Naphthalene (91-20-3) |
Safety Information
| Hazard Codes | Xn,N,F,T |
| Risk Statements | 22-40-50/53-67-65-38-11-39/23/24/25-23/24/25-52/53-20 |
| Safety Statements | 36/37-46-60-61-62-45-16-7-33-25-9 |
| RIDADR | UN 1334 4.1/PG 3 |
| OEB | A |
| OEL | TWA: 10 ppm (50 mg/m3), STEL: 15 ppm (75 mg/m3) |
| WGK Germany | 3 |
| RTECS | QJ0525000 |
| Autoignition Temperature | 978 °F |
| TSCA | Yes |
| HazardClass | 4.1 |
| PackingGroup | III |
| HS Code | 29029010 |
| Hazardous Substances Data | 91-20-3(Hazardous Substances Data) |
| Toxicity | Acute oral LD50 for guinea pigs 1,200 mg/kg, mice 533 mg/kg, rats 1,250 mg/kg (quoted, RTECS, 1985). |
| IDLA | 250 ppm |
Product Application of Naphthalene CAS#91-20-3
Naphthalene is mainly used in the production of phthalic anhydride and also serves as a raw material in the manufacture of dyes, pharmaceuticals, and other chemical products.
