Polyurethane Sealants

Bostik Seal N Flex 1

Bostik Seal N Flex 1 is a low modulus, one component, Class A polyurethane sealant. When cured it will form a tough, flexible seal capable of cyclic expansion and compression movement of 50% (+ 25%) of the original joint width. Seal N Flex 1 is virtually unaffected by normal weathering conditions such as rain, sunlight, snow, sleet, ultra-violet radiation, ozone, atmospheric contamination and pollution. Its excellent weather ability enables it to retain its original properties after years of exposure.


  • Low modulus 50% (+ 25%)
  • Excellent durability
  • One component, no mixing required
  • Australian made
  • Colour range
  • Acoustic rating
  • Paintable (refer limitations)
  • Non staining
Use for sealing joints in:
  • Insitu concrete & render
  • Precast and tilt up panels
  • Brickwork & block work
  • Plasterboard face and paper lined recessed edges
  • Fiber cement sheet
  • Aluminium windows
  • Granite, sandstone and marble
  • GRC, fibreglass & most specialty panel systems