For various reasons, even people familiar with the variety of existing conformal coatings, their strengths, weaknesses and respective use often assume that the chemical vapor deposition (CVD) process used for parylene films incorporates a solvent, as an integral component of the procedure. This is false, for the reasons detailed below.
The parylene variants are resistant to solvents and protect substrates solvents. This high level of security is maintained through temperatures of 150° C, seldom encountered in the actual use of PCBs or related electronics. These properties are largely a development of the unique molecular structure of parylene polymers, rendering them:
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There are a lot of different pieces of conformal coating equipment. Each one of them has their own unique purpose and drying cabinets are no different. The three main uses of drying cabinets are to extract air from around the assemblies, hold the assembly still during curing, and to protect the card from damage.
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