Potting of electronic and electrical components
Dispensing technology for polyurethane, epoxy and silicone
Electrical and electronic components are used in a large number of products and their reliability has become a matter of course for the end customer – even under extreme ambient conditions. Such conditions may range from impacts and vibrations to dust or moisture or even high temperatures. To ensure reliable operation and correct electrical insulation, the components are potted with liquid compounds. Potting forms a permanent joint with the component and thus protects it against unauthorised intervention. Depending on the potting compound and the specific application, the process is carried out under atmospheric pressure or vacuum. One of the processing challenges faced is to achieve bubble-free potting because entrapped air will lower the insulation and protection capability as well as the mechanical strength of the components.
Intelligent solutions by DOPAG
DOPAG mixing and metering systems enable repeatable high-precision metering. Such metering involves a constant mixing ratio even at varying flow rates in dynamical processes. As seen both from the ecological and economical perspectives, DOPAG metering and mixing systems promote a sustainable production process. The materials to be processed are mixed based on the specific demand which means material consumption and waste disposal costs can be reduced. The use of flushing agents is not required.
Most of the potting compounds used in electronics are polymers based on polyurethane (PU), epoxy resin and silicone. Thanks to their high thermal stability and the fact that they can be from soft to extremely hard, e.g. PU cast resins are used for numerous applications such as potting of printed circuit transformers in PCBs. Today, PU cast resins that belong to the class F of the insulation system and show a high thermal stability are increasingly being used for potting electronic components while elastic PU cast resins are being used for automobile electronic systems.
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