Why elastic bonding is durable?

The elastic bond will reversibly compensate movement and stress between the substrates. Origin are different thermal expansion, surrounding vibrations and other loads. In order to compensate movement and stress the adhesive needs a certain thickness. Elastic bonds are thick film of several mm. Too thin films will lead to failure within the adhesive or adhesion loss. In contrast to mechanical fixation the objects do not need to be perforated and the stress is evenly transferred over a wide area. The bond is generally invisible allowing discreet connections.

ADHESION - THE KEY OF BONDING

Durable adhesion of the adhesive to the substrate surfaces is essential for a reliable strong bond. Each adhesive has its own adhesion range. Therefore please follow our adhesion table for each of the bonding partners. Before bonding check the substrates surface strength and clean them. The adhesive will stick to the dirt, but does the dirt stick to the surface? Generally the use of primers and activators will significantly increase the adhesion and durability. Especially on plastic surfaces activators and on porous substrates primers will increase the wetting. However primers are adhesion promoters. They are neither a substitute for the correct cleaning of a surface, nor do they improve the strength of the surface significantly.

No initial fixation during curing

The temporary mechanical fixation of the objects during curing was a crucial disadvantage of construction bonding. Temporary fixations are a support that hold the objects in place during curing of the adhesive. Often tapes, laths or nails are used. They mean additional work and need to be removed.

  • Grab adhesives need no temporary fixation as they are strong enough in their uncured state to hold the objects in place until the material has fully cured.
  • For bonding heavy objects without a temporary fixation high grab adhesive is required. These high viscous adhesives are generally applied through a V-cut nozzle as beads in intervals of a few centimeters.
  • For lighter objects less initial grab is required and the adhesives are easier to apply than the viscous high grab adhesives.
  • After joining the objects with grab adhesives they can still be slightly shifted and adjusted during a certain time. Despite initial fixation the objects are not bonded until the adhesive is completely cured.
SikaBond®-115 Strong Fix

1-component, solvent-free, water-based construction adhesive with final high strength used for interior decoration.

SikaBond®-114 Grip Tight

1-component, solvent-based construction adhesive with a wide adhesion range used for universal bonding.
 

Sikaflex®-118 Extreme Grab

1-component, solvent- and Phthalate free adhesive with very high initial grab.