Properties and Application Characteristics of Silicone Sealants For Facades

Facade Glazing Sealant

One-Part Silicon Sealant Systems

  • Ready-to-use grade. Already contains cross-linker and catalyst
  • Supplied in cartridges or foil packs, can be used immediately
  • Easy to use (field glazing in two-sided structural glazing, repair glazing, weatherseals)
  • Require atmospheric moisture for vulcanization at room temperature
  • Vulcanization starts at the surface and continues inwards relatively slowly
  • Curing rate depends on relative air humidity, temperature and joint depth
  • Minimum time span between bonding and assembly of the structural glazing elements: 2 to 4 weeks depending on air humidity and joint dimensions
  • Joint bite limited to maximum 15 mm, otherwise curing takes too long and there is a risk of cracking

Two-Part Silicon Sealant Systems

  • Basic compound and cross-linker are mixed during application
  • Supplied in drums and pails, components must be mixed by machine
  • Execution under controlled conditions in the factory resulting in higher quality of the bond
  • No atmospheric moisture required for vulcanization
  • Once the components are mixed, curing begins uniformly through-out the joint with a gradual increase in viscosity
  • Curing rate depends virtually only on the temperature
  • Minimum time span between bonding and assembly of the structural glazing elements: 3 to 5 days, depending on frame materials
  • Should be used for thicker silicone adhesive sealant layers. Greater joint bite than 15 mm possible, since considerably higher curing rate and lower volume shrinkage on curing
  • Efficient factory prefabrication of structural glazing elements possible. Elements are faster to transport and install