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Polyurethane Joint Sealant Fulaflex 550 PU LM :  

   

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).   

Benefits   

  • 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
  • Non-hazardous according to Safe Work Australia criteria Uses
  • 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   

Uses   

  • 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
  • Conformance Standard Fulaflex 550 PU LM meets the requirements of ASTM C 920, Type S, Grade NS, Class 25, use T1, NT, A and M. Fulaflex 550 PU LM has been certified according to: - ISO 11600/F/25LM and DIN 18540/F - BS 6920-1:2000 Potable Water - ASTM 793-91 and DIN 11431
  • Compatible Substrates: Concrete, Cement Sheet, Ceramic, Masonry, Polyurethane, Plasterboard, Polystyrene, Steel, Aluminum (uncoated), Timber, Plastic and coated metals (Pre-Test), Glass (Not suitable for external glazing)   

Performance Data 

  • Specific Gravity: ca. 1.33
  • Sag: 0mm (25mm x 12mm joint)
  • Tooling Time: ca.40 minutes @ 23 C & 50% RH
  • Skinning Time: ca. 40-60min, 23 C, 50% RH
  • Cure Rate: ca. 3-4mm/day (23 C)
  • Hardness (Shore A): Ca 30
  • Shrinkage: 4% Max
  • Max Elongation: >700%
  • Flexibility (ISO 9047:)+/- 35%
  • Elastic Recovery: ca. 99% @ 100% extension
  • Modulus 50%: ca. 0.60MPa
  • Modulus 100%: ca. 0.70MPa
  • Modulus Max: ca. 2.20MPa   

All surfaces must be clean, dry, sound and free of dust, oil, old sealant or other contamination. Lightly contaminated surfaces should be wiped with Isopropyl Alcohol (IPA) using the 2-rag wipe method. Apply IPA to a clean lintfree cloth and wipe onto the surface to be cleaned to solubilize and remove the majority of the contaminant. A clean dry cloth should then be applied to remove remaining contamination and dry the surface. Ensure wet cleaner is not allowed to dry on surface. For more heavily contaminated surfaces or where the IPA does not remove the contaminant, a generic wax and grease remover should be applied using the same 2- rag wipe method. Once this has been completed the surface should be given a final clean with IPA using the 2-rag wipe method to ensure the surface is adequately prepared. Adhesion to metals and some surface finishes can be further improved by light abrasion prior to cleaning with IPA using the 2 rag-wipe method. Manufacturers of plastics should be consulted about suitable cleaning solvents. Adhesion to plastics should be pre-tested. Mask either side of joint to produce a neat finish.  

Use a suitable sized foam backing rod or polyethylene bond breaker tape to prevent three sided joint contact impeding the free and even deformation of the sealant in a cyclic joint. Open-cell polyurethane foam is recommended. Use a size 25% wider than the joint width that will compress when inserted into the joint.  

Priming - For difficult substrates In conditions where a primer is necessary prior to application of Fulaflex 550 PU LM, HB Fuller recommends the application of TEC Multipurpose Primer on approved substrates. Apply primer as detailed on the TEC Multipurpose primer datasheet, allowing time to cure, before applying Fulaflex 550 PU LM as per guidelines. All surfaces should be cleaned prior to the application of TEC Multipurpose Primer.  

Product Application  

Insert the sausage into the applicator gun and make a small incision at the extrusion end of the sausage. Fit the barrel end and nozzle, with the nozzle cut to deliver the appropriate bead size.  

Gun Fulaflex 550 PU LM by pressing the trigger to continuously fill the joint - while ensuring that air does not get trapped in the sealant/joint. After filling an appropriate length of joint, smooth the sealant with a spatula or trowel, pressing the sealant into the joint to form the required finish while ensuring the sealant fills the joint and is complete contact with the substrates. The application tool should contact the entire surface that is required to be tooled, and may be dipped in solution of detergent/soap and water (approx. 1:5 ratio), ensuring that the solution does not get into the bonding areas  

Good joint design in the construction industry necessitates a joint width equal to 4 times the anticipated movement of building components. The theoretically derived 2:1 movement factor is based on thermal movement alone and doesn't allow for variances found at the job site and therefore should not be used. The 4:1design factor accommodates both thermal movement and wide variations in tolerances of construction materials, fabrication and erection often found in the field. This will also accommodate joints installed narrower than originally designed. In standard expansion joints, the joint should be minimum 6mm width. For joints between 6mm and 12mm width, the depth of the sealant should be the same as the width.  

 

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