性质 grade analytical standard assay ≥99.5% (GC) shelf life (limited shelf life, expiry date on the label) refractive index n20/D 1.435(lit.) n20/D 1.435 bp 131 °C/4 mmHg(lit.) mp 5.5 °C(lit.) density 0.864 g/mL at 25 °C(lit.)