Physical and chemical properties Appearance and properties: colorless or light yellow transparent liquid At 20 C(lit.) Boiling point: 199 C(lit.) Flash point: 80 C Refractive index: N20 /D 1.479 Molecular structure data 1. Molar refractive index: 52.87 2. Molar volume (m3/mol) : 187.6 3, equal tension specific volume (90.2K) : 424.5 4. Surface tension (DYNE /cm) : 26.1