15mm Expanding Sealant Tape / 3-7mm x 8mtrs Each

Expanding Sealing Tape is a soft polyurethane foam tape impregnated with an acrylic-based, UV-stabilised, water-repellent resin containing a fire retardant. It is supplied in pre-compressed rolls with a self-adhesive face to assist initial location. The product is intended for use as an external weather seal for window perimeter seals and other construction movement joints. It is designed for use within the joint width limits stated in the tape selection table.

Intended Applications

The tape is intended for sealing a wide range of movement joints, including perimeter joints around windows. It provides a weather seal for wind-driven rain and accommodates joint movement while maintaining the seal. The tape also provides thermal and acoustic insulation as described in the technical information.

Sizes and Selection

The product is available in a range of tape widths (joint depths) and sizes to suit specific joint/gap widths. The tape should be selected so that the tape width (joint depth) is at least equal to the tape thickness (joint width) in service. Each order reference corresponds to a specific gap range and roll length.

Installation Guidance

The technical data sheet provides detailed installation instructions:

• Measure the joint width and ensure total movement is within the tape’s capacity before selecting the size.

• Remove the release liner and the opening wedge at the roll start.

• For construction joints containing cross-joints, tape may be installed horizontally or vertically; however, for door and window installations, horizontal lengths should be applied first, followed by vertical lengths, with the adhesive side positioned on the frame.

• Do not stretch the tape during installation.

• In cold or damp conditions where adhesion is reduced, a temporary wedge may be used to hold the tape in place while expanding.

• The tape should be recessed at least 2mm into the joint.

• Add 20mm/m to the measured joint length when calculating tape length.

• At the end of a roll, cut off any wedge finish and butt-joint the next roll in a compressed state as illustrated in the sheet diagrams.

• For CWCT TN41 hose testing, a minimum tape width of 25mm is recommended, and the tape should condition in the joint for 7–10 days before testing.

• For window and sloping sub-sill installations, the joint must not deviate more than 5° from parallel.

• When installing near PU foam, ensure the tape has fully expanded before applying foam to avoid contamination of the external face.

   

Technical Characteristics

The tape meets specific stated performance criteria, including:

• Fire classification to EN 13501-1: Bs1, d0.

• Additional classification under DIN 4102: B1, self-extinguishing (P’NDS 04-229).

• Exposure class BG1 for impregnated foam tapes (DIN 18542).

• Thermal conductivity λ10 <0.048W/mK (DIN 52612).

• Vapour resistivity µ <100 (DIN 52615).

• Resistance to root penetration (DIN 4062).

• Air permeability a <1.0m³/[h·m·(daPa)²/³], meeting the requirements of DIN 18542.

• Weathertightness against driving rain to minimum 600Pa, independently supervised by MPA Hannover under DIN 18542 / DIN EN 1027.

• Compatibility testing confirms no signs of corrosion on iron, zinc, steel, galvanised steel, aluminium and copper and no adverse effects with concrete, brick, some stones, PVC, Plexiglas or timber.

• Stated life expectancy is >25 years, with a 15-year performance guarantee subject to conditions.

• Service temperature range is −30°C to +90°C.

• Shelf life is 2 years in original unopened containers.

   

Handling and Storage

Rolls should be stored horizontally in their original packaging between +1°C and +25°C in dry conditions and away from direct sunlight. Opened boxes should be weighed down to prevent lateral expansion (telescoping). Packaging should be resealed between uses to prevent premature expansion during storage.

Limitations and Additional Notes

• The tape is not suitable for locations subject to standing water or where the tape cannot be positioned within 2–3mm of an adjacent vertical face.

• Tape expansion accelerates in high temperatures and slows in low temperatures; at temperatures above 20°C, tape should be stored in a cool, shaded place.

• Compatibility with sealants must be confirmed if the exposed edge is to be plastered or painted, as some white sealants may be incompatible.

• The tape must not contact chemicals containing solvents or aggressive agents.

Technical Data