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制造空心复合材料部件必须有心轴。对一些应用场合使用在制品内能溶解的心轴。常规可溶心轴采用块盐制造,但重且热膨胀系数高,要用高压水使其溶解。硅酸钠粘结砂子制成的心轴也是难处理的,因为重且砂的耐磨使加工困难。石膏心轴不溶于水,必须用腐蚀性洗涤溶剂使其溶解。用树脂粘结聚氯乙烯微珠制成的心轴,由于低的热稳定性是交联的,这意味着有时必须用机械方法除去心轴。
Hollow composite parts must have a mandrel. For some applications use a mandrel that dissolves within the article. Conventional soluble mandrel made of salt, but heavy and high thermal expansion coefficient, to use high-pressure water to dissolve. Spindles made of sodium silicate bonded sand are also difficult to handle because of the heavy sand abrasion that makes processing difficult. Gypsum mandrel is insoluble in water, it must be dissolved with a corrosive washing solvent. Mandrels made of resin-bonded polyvinyl chloride beads are crosslinked due to the low thermal stability, which means that the mandrel must sometimes be mechanically removed.