KingshengPCBA Protection and packaging - China PCBA Supplier

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PCBs intended for extreme environments often have a conformal coating, which is applied by dipping or spraying after the components have been soldered. The coat prevents corrosion and leakage currents or shorting due to condensation. The earliest conformal coats were wax; modern conformal coats are usually dips of dilute solutions of silicone rubber, polyurethane, acrylic, or epoxy. Another technique for applying a conformal coating is for plastic to be sputtered onto the Printed Circuit Board (PCB) in a vacuum chamber. The chief disadvantage of conformal coatings is that servicing of the board is rendered extremely difficult.

Many assembled printed circuit boards (PCBs) are static sensitive, and therefore must be placed in antistatic bags during transport. When handling these pcba boards, the user must be grounded (earthed). Improper handling techniques might transmit an accumulated static charge through the board, damaging or destroying components. Even bare pcb boards are sometimes static sensitive. Traces have become so fine that it's quite possible to blow an etch off the pcb board (or change its characteristics) with a static charge. This is especially true on non-traditional printed circuit boards (PCBs) such as MCMs and microwave PCBs.