Naphthalene
• CAS Number: 91-20-3
• Chemical Formula: C10H8
• Synonyms:
▪ NAPHTHALENE WHITE, PURE
▪ Naphthalene, refined
• Appearance: Colorless and shiny monoclinic crystal
• HS Code: 29029010
• MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Products Description of Naphthalene CAS# 91-20-3
Naphthalene is the simplest condensed aromatic hydrocarbon composed of two benzene rings, commonly known as "mothball" (or "sanitary ball"). It is one of the main products of coal tar processing. Industrially, naphthalene exists in the forms of crude naphthalene (including industrial naphthalene and pressed naphthalene) and refined naphthalene.The molecular formula of naphthalene is C₁₀H₈, with a molecular weight of 128.17. Its key physical properties are as follows: melting point is 80.28℃; solid density is 1.145 g/cm³; liquid density (at 85℃) is 0.9752 g/cm³; specific heat capacity (at 100℃) is 1809 J/(kg·K); refractive index (at 85℃, source: Chemicalbook) is 1.5898.Naphthalene is a colorless monoclinic crystal, featuring volatility and sublimability, with a characteristic odor. It is flammable and can form an explosive mixture with air; its petroleum ether solution exhibits red-purple fluorescence under a mercury lamp. It is almost insoluble in water but soluble in solvents such as ether, ethanol, and benzene.Inhalation of naphthalene vapor or dust, or absorption through the skin, can cause poisoning. The maximum allowable concentration of naphthalene in air is 20 mg/m³.Naphthalene is one of the basic raw materials for industries including dyes, plastics, coatings, pharmaceuticals, and pesticides. It was once directly used as a moth-proof ball 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 | 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) |
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
It is primarily utilized in the production of phthalic anhydride, and also serves as a raw material for manufacturing dyes, pharmaceuticals, and other related products.
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