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Insulation Marine & Water Building & Construction

Lightweight, cross-linked, closed cell, expanded Polyethylene joint former with hinged temporary blocking piece.
  • Used as an expansion / contraction joint former.
Product Description
Directions for use:
  1. Ensure all concrete surfaces are free from base grit and dust.
  2. Apply glue in vertical strips 100 mm wide and 25 mm from the top to avoid the tear-off strip from sticking to the concrete face.
  3. Allow the glue to dry (according to manufacturer’s instructions) and then stick Jointex onto the glued concrete face.
  4. Cast the next section of concrete as required. Take care not to let the wet concrete get behind Jointex as this will result in a wavy joint.
  5. When the joint sealant is about to be applied, simply peel the tear-off strip out of the formed joint, leaving an even groove of uniform depth for filling with sealant.
Typical Compression Stress – strain (Compression – deflection): ISO 3386/1:


Composition: Closed cell, cross-linked expanded Polyethylene.
Density: 33 kg/m (nominal).
Size: Available in various sizes and thicknesses according to requirements.



Features of this product
  • Jointex has good compression qualities with good recovery capacity.
  • Supplied with a hinged temporary blocking piece, leaving a clean, neat and perfectly sized groove providing a consistent depth channel for joint sealant.
  • Supplied cut to size, eliminating wastage and cutting on site.
  • The material is flexible and can be used around corners.
  • Excellent resistance to chemicals.
  • Is waterproof, does not disintegrate, rot or swell.
  • No bond breaker required.
Technical Specs
  • Compression Deflection: 10 %: 36 kPa; 25 %: 61 kPa; 50 %: 143 kPa.
  • Compression-Set: 25 % 22 hr COMP. / 24 hr REC.: <6 %; 50 % 22 hr COMP. / 24 hr REC.: <20 %.
  • Resistance: Good resistance to dilute acids and alkalis.
  • Flammability: <310 mm / min. on a 3 mm sample.
  • Thermal Conductivity: 24 C: 0.037 W/m.K.
  • Temperature Range: Up to 90 C.
  • Tensile Strength: >163 kPa.
  • Elongation and Break: >144 %.

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