An electrofusion joint (1), for use in connecting plastics pipes (4), which comprises a coil electric heating wire (3) embedded in a cylindrical resin body (2), wherein (a) said resin is an adhesive resin; and/or (b) said coil (3) has a substantially unoxidized surface; and/or (c) said coil (3) is coated with a substance having affinity to both the resin and the coil.
