A foamable phenolic resin was prepared,through addition,condensation,in the presence of alkali.The resin was foamed with surfactant, foamer,solidifying agent , then the foam phenolplast was given .

苯与甲醛在碱条件下经加成、缩醛树脂，该树脂和表面活剂、泡剂、固化剂一起泡即醛泡沫塑料。