Naphthalene CAS# 91-20-3
High Industrial Versatility: Naphthalene is widely used in industries like dyes, plastics, paints, and pharmaceuticals due to its solvent properties and versatility.
Sublimation Ability: Naphthalene readily sublimes, which makes it useful in applications like moth repellents and air fresheners.
Solubility in Organic Solvents: It dissolves well in organic solvents like methanol, ether, and benzene, enabling its use in diverse chemical processes.
Stable at High Temperatures: With a high boiling point and autoignition temperature, naphthalene remains stable in various industrial environments, minimizing risk during storage and use.
Naphthalene, a simple aromatic hydrocarbon made of two benzene rings, is commonly known as "sanitary ball." It is primarily produced from coal tar and comes in forms such as crude naphthalene (industrial or squeezed) and refined naphthalene. With a molecular formula of C10H8 and a molecular weight of 128.17, naphthalene has a melting point of 80.28°C and a density of 1.145g/cm³ (solid) and 0.9752g/cm³ (liquid at 85°C). Its specific heat capacity is 1809J/(kg·K), and its refractive index at 85°C is 1.5898.
This volatile, flammable, and sublimable substance has a distinct odor and can form explosive mixtures with air. It is almost insoluble in water but dissolves in solvents like ether, alcohol, and benzene. Naphthalene vapors and dust can be toxic if inhaled or absorbed through the skin, with a maximum allowable air concentration of 20 mg/m³. It is widely used in industries such as dyes, plastics, paints, and pharmaceuticals and was previously used as a moth repellent.
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 |
