Many capacitors and resistors require an insulating coating after manufacture to protect against physical, chemical, and electrical stresses. These components are often mounted on circuit boards and may be a hermetically sealed in metal, glass, or ceramic cases. A majority of the units are insulated with an organic polymer which is easier to apply and can be more cost effective. The insulation may be supplied as a one or two component liquid polymer, or in many cases, molded by either a transfer or injection process. Another fast and economical process is to apply a powder coating to the finished units.
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