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Joint Backer Plus

TP300 is an open cell polyurethane foam tape, impregnated with a bitumen free acrylic resin, with the main functions of a weather and acoustic seal and backing for sealant joints where the tape will act as a secondary seal.


TP300 is designed as a special joint backing foam, providing a secondary weather seal in a weatherproof joint.  It is suitable for use in various joint types (e.g. masonry and light and heavy-weight prefabricated components).  TP300 is also available in other dimensions to enhance the acoustic performance of curtain wall fabrications.  For these applications please check the specific requirements with your systems supplier.

  • Weathertight to 300 Pa
  • Self-adhesive to one face
  • Vapour permeable
  • Provides thermal and acoustic insulation
  • Solvent free


Joint Size Tape Thickness (a) mm   Joint Depth* Tape Width (b) mm  Tape Order Reference  Roll Length m

3 - 7                                             10                                                10/3 - 7                     13                         5 - 10                                           15                                                 15/5 -10                    5.5

Technical data


DensityNF EN ISO 84555±5 kg/m³
Elongation at BreakDIN 53571115%
Resistance to TractionDIN 53571 110 KPa
Weather TightnessEN 1027300 Pa
Air PermeabilityNF P 85-570Class 2
Thermal ConductivityDIN EN 12667  ʎ = 0.048 W/m.K
Water Vapour Permeability (sd value) < 0.5 m
Acoustic Performance 56 dB
Service Temperature -30°C to +90°C
Minimum Application Temperature 0°C
Storage Store in shaded dry conditions with rolls laid flat
Shelf Life 12 months when stored as recommended in original unopened packaging.
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