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TP651 is an impregnated, pre-compressed multi-functional sealing tape. It is comprised of open-cell polyurethane soft foam, impregnated with flame-retardant synthetic resin. The different vapour diffusion properties are achieved through a unique, one-sided patented side impregnation. The impregnation also protects the tape against mould and fungi.
TP651 utilises the property of water-vapour permeable sealing, making it less permeable inside than outside (inside tighter than outside principle).


TP651 is used for sealing the perimeter joints of windows and doors against driving rain and provides airtightness. It also offers thermal insulating properties within the perimeter gap between the window and reveal and maintains the energy rating of the window/door. An ‘A’ rated (WER) window can therefore be classed as having an ‘A’ rated installation*.* Installation rating not included in BFRC ‘WER’ scheme

Safety data sheet must be read and understood before use.

  • Suitable for new-build and replacement installations
  • Meets BS8213-4:2016 Code of Practice & GGF Guide to Good Practice – Installation of replacement windows and doors Maintains the energy rating of the window
  • Resistance to driving rain (up to 600Pa), provides thermal and acoustic insulation and air tightness all in one product
  • Meets CWCT test for site water tightness (TN41)
  • Quick and easy window sealing in one application
  • All-weather installation
  • Breathable
TP651 Safety Data Sheet (en-GB).pdf Safety Data Sheets
TP651 Technical Data Sheet (en-GB).pdf TDS