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H.B. Fuller FulaFlex 550 PU Sealant—Low Modulus • BLK

Product Code:     FFPUB

Availability:     In Stock

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Fulaflex 550 PU LM is a one-component moisture-curing low modulus Class A polyurethane sealant with excellent joint movement capabilities. It cures into a flexible, durable and weather resistant sealant and exhibits excellent adhesion to a wide range of substrates. Fulaflex 550 PU LM is low in VOC (<60g/L) and satisfies the requirements for the Green Building Council of Australia (GBCA). Fulaflex 550 PU LM is AS4020.2005 Potable water approved.


  • Easy application, simple clean up – minimal mess
  • Excellent adhesion to many surfaces
  • Excellent UV resistance
  • Paintable
  • Low modulus
  • Low VOC – ca. 58g/L
  • Excellent flexibility (tested to ± 35% ISO 9047)
  • Fast curing after skinning – Ideal for applications requiring a fast turnaround
  • AS4020.2005 potable water approved


  • Building joints with high movement
  • Joints in pre-cast and tilt-up concrete elements
  • Connection joints between windows, doorframes and walls
  • Joints in brickwork, masonry and blockwork
  • Perimeter fillets in waterproofing membrane systems
  • External applications where a high performance joint and UV stability is required that can also be painted


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