The recently developed SEMICOSIL® Paste 30 TC and SEMICOSIL® Paste 40 TC are both one-component, non-curing, low-stress silicone pastes with a thermal conductivity at 3.0W/mK and 4.0W/mK respectively. Thanks to the exceptional flowability, the products cure to form a thin, homogenous layer that can easily compensate surface tolerance of the component. For optimum heat transfer, only a very thin layer is needed. SEMICOSIL® Paste TC can not only be used for fast dispensing and printing process, but also for filling tiny gaps between thermal interfaces. Furthermore, the product is stable under thermal aging conditions and is suitable for the heat management of PCB for electrical vehicles.
The new ELASTOSIL® RT 76XX TC series is a thermally conductive potting glue which consists of a two-component, addition-curing silicone rubber with a thermal conductivity ranging from 1-2 W/mK. The product cures at room temperature. Featuring low viscosity and good flowability, it is suitable for the potting of the articles with complex structures. ELASTOSIL® RT 76XX TC series can be used for the thermal management of 48-volt batteries, on-board chargers and power converters. Elasticity remains unchanged between -50 and +180 degrees Celsius, the potting glue meets the challenging long-term reliability needed for electrical vehicles.
SEMICOSIL® 96X TC thermal conductive gap fillers cure at room temperature via addition reaction to form soft silicone elastomers with tacky surfaces. The cured rubber achieves a thermal conductivity of 2 to 3.5W/m.K, and, at the same time, is electrically insulating. SEMICOSIL® 96X TC can be quickly dispensed to meet the requirements of industrial production processes. Before curing, SEMICOSIL® 96X TC features good rheological properties which ensure high-speed and non-sag dispensing. The optimized formulation for dispensing systems allow them to be easily fed by machine with lower wear, and therefore achieve a stable and efficient production.
At EV Tech Shanghai, WACKER will also showcase SEMICOSIL® and ELASTOSIL® silicone sealants for the manufacturing of Cured-In-Place Gaskets CIPG. These are able to replace solid gaskets with the dispensing process necessary for assembly. The flexible design of the dispensing process allows one glue to be used to seal articles in different sizes, which is easier in terms of material management. Several product grades are available to meet properties and functions required for key components of electric vehicle, such as high and low strength, low density, cooling fluid resistance and the sealing of fuel cells. For example, ELASTOSIL® SC 870, a thixotropic, addition-curing, two-component silicone elastomer, cures quickly at room temperature, forming a mainly closed cell foam. Featuring excellent damping properties, it is widely used in the light-weight sealing of batteries and controllers.