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以高锰酸钾为氧化剂，以浓硝酸和丙酸组成的混合液为插入剂，以天然鳞片石墨为基质制备了无硫可膨胀石墨。制备的适宜条件为石墨∶丙酸（９９５％）∶浓硝酸∶高锰酸钾＝１∶０５∶０６∶００６（质量比），反应温度２５℃，反应时间为４０ｍｉｎ。采用无素分析仪和质谱仪对无硫可膨胀石墨的组成进行了分析。
Using potassium permanganate as oxidant and mixed solution of concentrated nitric acid and propionic acid as intercalator, sulfur - free expandable graphite was prepared from natural flake graphite. The suitable conditions for the preparation of graphite: Propionic acid (99.5%): concentrated nitric acid: potassium permanganate = 1:05:06:06 (mass ratio), the reaction temperature was 25 ℃, the reaction time was 40min. The composition of sulfur - free expandable graphite was analyzed using a non - elemental analyzer and a mass spectrometer.