| 摘要 |
A method of connecting a first polyolefin pipe element 1 to a second pipe element 3 by electrofusion, the first polyolefin pipe element 1 prior to jointing having a substantially intact oxidised surface layer 9, comprises providing a surface of one of the pipe elements 3 with a surface layer of a polymer composition containing at least 0.1% of an adhesive polymer derived from epoxy or unsaturated acyl compounds. The invention also provides an electrofusion coupling device having at least its surface, and possibly its entire body, formed of a polymer composition containing at least 0.1% by weight of an adhesive polymer. <IMAGE> |
