Bubbles can be a real challenge in any adhesive or coating, but they are particularly undesirable when covering electronics and printed circuit boards (PCBs) with fluid conformal coating material. The technical support engineers at HumiSeal have over five decades of experience in support of PCB manufacturers. They report that bubbles within the finished film are the most commonly reported technical issue they receive.
Recently, there has been a surge in international environmental awareness, with various manufacturers actively seeking new eco-friendly solvents and green materials for their processes. Among these, the traditional protective coatings for printed circuit boards often contain solvents like toluene and xylene, which are aromatic hydrocarbons. While these solvents boast good solvency and fast drying speeds, they also come with some negative health and environmental impacts.
With the increasing demand for efficiency and cost-effectiveness in the PCB fabrication process, conformal coating is a protective layer or polymer film designed to shield electronic circuits from adverse environmental conditions. Tex Year is the first distributor of HumiSeal conformal coating in Taiwan and Vietnam. Starting from the PCB design phase, OEM manufacturers seek ways to reduce production costs and enhance capacity. However, cost reduction often involves using cheaper materials or minimizing the use of conformal coating whenever possible.
In the days before surface mount printed circuit assemblies, components (such as resistors, diodes, and capacitors) were axial, and printed circuit board components were installed with the “through-hole” method using large conductor spacing. With the advent of integrated circuits, these too were through-hole with good spacing between legs.
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