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Connection technology casing pipes

There are several joint constructions available for the different technical requirements. All PEHD-connection joints are used in order to reach a non-positive safety, gas- and watertight jacket-pipe connection.


The pipe layer will be responsible for slipping on the joint before starting the welding works. All joints consist of a PEHD-socket pipe. It will be generally possible to deliver all joints in special length, i.e. for post-insulation of the welding seams of an uninsulated on-way ball valve, a single-use expansion coupler or a fitting piece. Insulation and sealing of all kind of joints, except of isocompact®, should be carried out generally by isoplus-works-educated assembling specialists.


The shrink-sleeves which are part of some kind of joints consist of a heat shrinkable, molecular cross-linked and modified polyolefin with a sealing adhesive system consisting of an elastic-viscous sealing area. The kind of sleeve is resistant against thermal ageing, weather conditions and chemical influence as well as UV-rays and alkaline-earth.

Joint test procedure

In co-operation with accepted test institutes, isoplus offers extensive analysis of PUR-local foam and sleeves respectively of complete joint systems. The test procedures include all quality guidelines of EN 253 and EN 489 standard. Depending from requirements the quality control includes i.e.:

  • Visual expertise of storage, quality and processing of the materials
  • Destructive test of a sleeve by drawing off at cold condition
  • Test of a sleeve in the laboratory for tensile strength for: Elongation at tear, flexibility, water absorption, shear- and husk-strength as well as fusion point
  • Preparing of a test sample in a test box, for local used foam with expertise concerning starting time, rise- as well as foaming behaviour
  • Taking out of a 30mm drill-cone from the PUR-foam of a joint followed by a visual check concerning colouring, homogeneity and cell-structure
  • Testing of a foam sample in the laboratory concerning cell-structure, closed cells, foam density, pressure resistance and water absorption during boiling test
  • Investigation of a complete joint in the laboratory concerning the already mentioned points, checking concerning axial strength as well as shock- and creep resistance including statement of thermal conductivity[lambda] of the compound system