Solar-thermal systems are used for sustainable energy recovery, and make high demands on the materials used, which must first and foremost be resistant to weathering, radiation and heat. Silicone products are especially suitable for specific applications in harsh conditions. Hence, ELASTOSIL^® Solar self-adhesive silicones from WACKER ensure permanent bonding between the glass cover and the collector housing. Highly heat-stable WACKER silicone fluids AK and AP, as heat-carrier fluids, effectively remove the energy collected, and remain liquid even at low temperatures.