Product Description of Naphthalene CAS No. 91-20-3
Naphthalene is the simplest polycyclic aromatic hydrocarbon, featuring a molecular formula of C10H8. Its molecular structure consists of two fused benzene rings that share a pair of adjacent carbon atoms. It is commonly utilized as an important industrial raw material in the production of dyes, resins, solvents, and various chemical intermediates. It also has applications as an insect repellent.
Naphthalene Chemical Properties
| Melting point | 80-82 °C (lit.) |
| Boiling point | 218 °C (lit.) |
| density | 0.99 |
| 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 | 14,6370 |
| 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) |
| NIST Chemistry Reference | Naphthalene(91-20-3) |
| IARC | 2B (Vol. 82) 2002 |
| 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 |
| 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 |
Applications of Naphthalene CAS No. 91-20-3
Naphthalene is one of the most significant industrial polycyclic aromatic hydrocarbons. It is primarily used in the manufacture of phthalic anhydride, various naphthols, naphthylamines, and other chemical products. It also serves as an essential intermediate in the production of synthetic resins, plasticizers, dyes, surfactants, synthetic fibers, coatings, and pesticides. In addition, it is used as a raw material in the pharmaceutical, fragrance, rubber additive, and agrochemical industries.
The application ratio of naphthalene differs among countries and regions. Around 70% is consumed in phthalic anhydride production, approximately 15% goes into dye intermediates and rubber additives, about 6% is utilized in pesticide manufacturing, and roughly 4% is used for tanning agents. In the United States, a relatively higher percentage is allocated to pesticide production, particularly carbaryl. By using naphthalene as a starting material, a wide range of chemical intermediates can be synthesized through processes such as sulfonation, nitration, reduction, amination, and hydrolysis.
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