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 PCB in a vacuum chamber. The chief disadvantage of conformal coatings is that servicing of the board is rendered extremely difficult. COUNT 5
QSN1 If a PCB is intended for use in an setting with extreme conditions, what would probably be applied? ANS1 conformal coating QSN2 The conformal coating can prevent leaking, shorts, and what other type of moisture damage? ANS2 corrosion QSN3 A conformal coating can be applied by spraying the PCB or by doing what else to it? ANS3 dipping QSN4 What material was first used for conformal coating? ANS4 wax QSN5 What action is made much more difficult for boards that have a conformal coating? ANS5 servicing