B2 Expanding Gun Grade PU Foam

Name: B2 Expanding Gun Grade PU Foam

B2 rated, quick curing polyurethane foam filler. The cured foam is a good temperature and sound insulator, and has strong adhesive properties. Supplied in aerosol and gun grade versions.

Features: B2 Fire Rating according to DIN 4102-1. – Low curing pressure. – High thermal and acoustic insulation value. – Good volume expansion for effective filling.

Application: The fresh foam adheres to most common building materials including wood, concrete, stone, plaster, metal, PVC and polystyrene. Areas of Application: installation of window and door frames and entrance door linings (where a clean and controlled backfill is required) – filling of holes – insulation of penetrations – sealing of thermal and acoustic insulation boards – sealing and connection of joints – reducing the impact of thermal bridges.

Instructions: Preparation: Surfaces to be bonded must be firm, clean, dry and free from dust, grease or contaminants that may hinder adhesion. They must be moistened well with water. It is advisable to apply a primer well penetrating into the ground if necessary. All construction components must be properly prepared prior to foam application. It is advisable to have Foam Cleaner at hand.
Chilled cans must be carefully warmed in luke-warm water (below +45oC) before usage but avoid heating above +50°C, as there is a risk of bursting. Cans which are too hot, for example after having been left in a vehicle during summer, must be cooled using cold water. Prior to work, the can must be shaken thoroughly at least 15-20 times. Application: As from 24 August 2023 adequate training is required before industrial or professional use. The instructions for the can must strictly be observed. Use gloves and eye protection and avoid skin contact.
With Straw Adapter: Hold the foam can in upright position. Screw the applicator (straw) firmly to the foam can valve. Shake the can vigorously at least 30 times. For application, turn the can upside down and press the applicator trigger. Use the applicator trigger to adjust the foam output. With Gun Adapter: Hold the foam can in upright position, turn the gun to the can by holding the gun handle with one hand, and turn the can with the other hand. Make sure that the gun is not pointed at other persons when turning it. The can must not be screwed to the gun with the valve upside down or by turning the gun on the can. Care must be taken not to overtighten the adaptor and not to activate the valve during this process. Turn the can upside down and start applying. The foam output can be adjusted by the gun trigger. Turn the can upside down and press the applicator trigger, using the trigger to adjust the foam output. The fresh foam will expand by 2-2½ times. Therefore care must be taken not to overfill joints. Fresh foam spills must be removed immediately within the tack-free time with Bond It Foam Cleaner. Cured foam must be removed mechanically. Cleaning: Excess foam can be removed whilst still wet using Bond It Gun Foam Cleaner or Multi-Wipes. Cured foam can only be removed mechanically.

Limitations: Moisture is needed for an even and rapid curing of the foam. Inadequate moistening or overfilling of joints and cavities may lead to an unwanted post-expansion of the foam. Foam extrusion can be controlled accurately by varying the pressure on the adaptor or gun trigger. For foam extrusion the valve is pointed down but it will work through most angles. The valve lever is to be activated carefully. Once a can has been started, it should be used within four weeks. Cured foam is sensitive to UV light and direct sunlight and therefore should be covered with suitable opaque sealant, filler, paint or other material. Not suitable for PE, PP, PC, PMMA, PTFE, soft plastics, neoprene and bituminous substrates. Does not bond to Teflon®, siliconised or wax-like surfaces. Do not use in applications where continuous water immersion is possible. Note: This product has been tested for fire resistance for joints and penetration seals. It has not been tested for use around fire doors so cannot be used as a fire resistant seal around designated fire doors.