Expandable flexible graphite(EFG) sheets can be obtained in case of concentrated sulfuric acid or concentrated nitric acid used as intercalating agent alone.

• 单独用浓硝酸或浓硫酸在常温下浸泡柔性石墨,可得到可膨胀柔性石墨,它在合适的膨胀温度下处理,可制成外形完整的膨胀柔性石墨块。