A number of wuxia characters use the folding fan as a melee weapon. For example, Gong Nam Freak # 2 Chu Chung used one, and his fan was known to be ironclad.
Were these battle fans *always* ironclad, however? It was so specified for Chu Chung's fan, but what about the fans used by Au Yeung Hak, Fok Do, and a host of other characters? I can't imagine that an average, paper and wood fan would survive much combat against swords, sabres, spears, etc.