The inside (including the taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.
浮鞋的内部（包括锥型段部分）通常由水泥或热塑性材料组成，如果在套管鞋处井眼还需要继续加深的话这种材料必须被钻掉。
As a substitute of cadmium red and chrome red, is a match environment red pigment. Used in thermoplastic resin, thermosetting resin, alkyd resin, rubber, other polymer and cement, coating.
做为环境友好红色颜料，替代镉红及铬红。应用与热塑性树脂、热固性树脂、醇酸树脂、橡胶其他聚合物以及水泥、涂料等。
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