**3.4 Edge sealant**

Its primary function is blocking the lateral ingress of oxygen and moisture. Typical materials are polybutyl ("hot butyl"), silicones, and polyisobutylene (PIB). An interesting integration between edge sealant with desiccant materials was achieved by Quanex (SolarGain®).

Clearly, different configurations of the encapsulation components enable several encapsulation architectures. **Table 2** shows the most common architectures. Be advised that there is not a universal labeling of these structures:
