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
Flash point :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)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H228 Flammable solid Flammable solids Category 1 Category 2 Danger Warning P210, P240,P241, P280, P370+P378 H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501 H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:	P202 Do not handle until all safety precautions have been read and understood. P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P240 Ground/bond container and receiving equipment. P273 Avoid release to the environment. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P308+P313 IF exposed or concerned: Get medical advice/attention.