Propylene glycol butyl ether, min 99 %, for synthesis, Molar mass (M) 132,20 g/mol, Density (D) 0,88 g/cm³, Flash point (flp) 59,5 to 60 °C, Boiling point (bp) 171 °C, CAS No. [5131-66-8], UN-Nr. 1987, EG-Nr. 225-878-4, Empirical formula C7H16O2