GENIOSIL ® XB - Wacker Chemie AG


Hybrid Polymers for Structural Adhesive Bonds

Based on the innovative alpha-technology, the new GENIOSIL® XB hybrid polymers for the first time exploit the advantages of silane crosslinking for user-friendly, environmentally compatible structural adhesive bonds.

Thanks to their low viscosity, the new hybrid polymers are easy to compound. In particular, they can be formulated without using plasticizers or solvents. The use of tin catalysts can now also be eliminated – yet another advantage of using alpha-silane technology.

Adhesive formulators can modify the mechanical end properties and tailor them to requirements by adding other components such as fillers or catalysts. Adhesives based on GENIOSIL® XB cure upon contact with humidity in the ambient air to form thermosets and attain hardness in the upper Shore D range. In terms of adhesive strength, these adhesives are making advances into what used to be the exclusive domain of epoxy- and isocyanate-crosslinked systems. Depending on the substrate, the tensile lap-shear strengths can reach 15 N/mm².

They cure without blistering, develop strength quickly and adhere to many commonly used materials such as wood, glass, metals and ceramics – with no need for primers.

For formulators as well as end-users, the new hybrid polymers offer a range of advantages:

Overview of the advantages of GENIOSIL® XB 502
Formulator advantages: Formulator advantages:
Based on α-silane technology, therefore:
– No need for tin catalysts
– Long shelf life
– No hazardous substance classification
– Wide scope for formulation
One-part system
Low viscosity, therefore:
– Easy handling
– Fast compounding process
Processing similar to polyurethane-based adhesives
Waterproof products for wood bonding can be formulated that satisfy durability classes D1 through D4 (DIN EN 204) Isocyanate and solvent-free adhesives
No need for special (e.g., aluminum) cartridges Develops strength fast
No blistering
Good thermal stability
Little tendency to yellow
Excellent adhesion to wood and non-porous, primerless substrates