| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyolefin resin pipe joint which can remarkably reduce an amount of permeation of harmful substances such as organic solvents, oil and so on into a buried pipe. SOLUTION: In the electrofusion joint of a polyolefin resin pipe, an electrofusion joint main body 1 is formed with a solvent permeation prevention layer 4 made of a material composed of one selected from, a material mainly composed of one selected from, or a material composed by mixing two selected from polyamide, polyester, polyvinylidene chloride, polyvinylidene fluoride and ethylene vinyl alcohol copolymer. It is more difficult for a solvent to permeate the material than polyolefin resin. COPYRIGHT: (C)2007,JPO&INPIT
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