Industrial adhesive and sealant applications often fail due to a lack of sufficient temperature resistance of common materials. Most industrial adhesives or casting compounds such as polyurethanes or epoxy resins are based on organic raw materials that harden to form a polymer. The decomposition of such polymers begins at temperatures above 300 °C (but often well below), which leads to irreversible damage to the polymer chains and ultimately to failure of the entire structure.
Nonetheless, bonding or potting applications are also possible well above this temperature range. Special inorganic high-temperature ceramic-based adhesives have been formulated for such applications.
The high-temperature-resistant adhesives, casting compounds and coatings that we offer consist primarily of ceramic, refractory materials such as:
- Silicon dioxide (SiO2)
- Aluminum oxide (Al2O3)
- Zirconium oxide (ZrO2)
- Magnesium oxide (MgO)
which are premixed or will be mixed with water prior to use.
High-temperature-resistant coatings, adhesive joints, seals or casting molds for molten metal can be easily realized with the help of these pastes. They are also characterized by their high resistance to corrosion, oxidation and most chemicals.
The properties of ceramic-based adhesives are decisively determined by the type of ingredients used, including their purity and grain size distribution.
With a suitable choice of fillers, the physical properties such as mechanical strength, thermal expansion, dielectric strength, thermal and electrical conductivity can be selectively varied.
Polytec PT offers you the extensive range of materials from our long-term partner Cotronics®, which include both metallic and ceramic adhesives. The products offered can be supplied as one-component materials in powder or paste form, as well as two-component powder / binder systems. Depending on the respective reaction mechanism, curing either takes place by physical setting, i.e. through the evaporation of water or by chemically curing.