This site has been optimised for the best experience on portrait mode, please rotate your device to continue.

All Products


BOSS® 334 window & door, minimal-expanding gun foam is a one-component, ready-to-use polyurethane foam, formulated to seal the gaps around windows and door frames, and other rough openings. It expands in contact with air to generate an effective seal and is proven not to distort or bow window and door frames.


  • Excellent stability and high filling capacity.
  • Freon-free.
  • Good adhesion on all surfaces (except PE, PP, and PTFE).
  • High insulation value – thermal and acoustic.


  • Connecting of insulation materials and roof constructions.
  • Creation of soundproof screens and layers.
  • Filling of cavities and sealing of all openings in roof constructions.
  • Improving thermal insulation in cooling systems.
  • Installing doors and windows.


This product is available in champagne.


Available in a 750 ml aerosol can.

Quick info

You may also like…