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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

  • 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


Supplied on pre-compressed rolls, with self-adhesive on one side for initial location.

Technical data


PropertyTest MethodResult
Building ClassificationDIN 4102B2 (normally flammable)
GroupingDIN 18542BG1 + BGR
Thermal ConductivityDIN 52 612ʎ10 = 0.048 W/m.K
WaterVapour Diffusion, sd ValueDIN 18542α < 0.5 m
Vapour Pressure Gradient Less permeable inside due to side surface impregnation
Joint PermeabilityEN1026< 0.1 m³/[h.m.(daPa)2/3]
Resistance to Driving RainEN 1027600 Pa min.
Sound InsulationEN ISO 717-145 dB in 10 mm joint
Compatibility with Traditional Building MaterialsDIN 18542In accordance with BG1, perform a compatibility test on products that contain solvents or plastcicisers
Emission TestAgBB/ DIBt methodSuitable for interior use
Service Temperature -30°C to +90°C
Storage Store in dry shaded conditions between +1°C and +20°C
Shelf Life 9 months when stored in cool, dry conditions in original unopened containers.
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