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三层PE涂层已在国内的一些管道工程中被采用，对这种防腐涂层应采用的补口材料，有关规范未予明确规定，通过对二层和三层热收缩套补口材料的性能分析对比，提出应选用与管体涂层一致的补口材料。
The three-layer PE coating has been used in some pipeline projects in China. For this kind of anticorrosive coating, the material of the mouth-filling material is not specified clearly in the relevant specifications. Performance analysis and comparison, proposed should be consistent with the pipe coating material filling.