Hydroquinone, min. 99,5 %, p.a., Molar mass (M) 110,11 g/mol, Density (D) 1,33 g/cm³, Flash point (flp) 165 °C, Boiling point (bp) 287 °C, CAS No. [123-31-9], UN-Nr. 3077, EG-Nr. 204-617-8, Empirical formula C6H6O2