Parylene Coating Blog by Diamond-MT

Solvent Use in Parylene Deposition

Posted by Sean Horn on Fri, May 26, 2017 @ 07:32 AM

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.

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Tags: parylene, parylene process, conformal coating solvents, solvents

Solvent Resistance of Parylene

Posted by Sean Horn on Fri, May 12, 2017 @ 07:25 AM

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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Tags: parylene, parylene properties, conformal coating solvents, solvents

What Solvent Breaks Down Parylene?

Posted by Sean Horn on Fri, Mar 03, 2017 @ 07:21 AM

While parylene provides a reliable, versatile conformal coating, it can require removal.  When circumstances necessitate removal of liquid coatings – acrylic, epoxy, silicone or urethane – a wide range of chemical solvents can be used to detach the film from the underlying substrate.  No single chemical material/process is equally successful for all uses, but solvent processes are employed most frequently because they do the least damage to printed circuit boards (PCBs) and their components.  Such is not the case with parylene. 

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Tags: parylene, conformal coating solvents, solvents, parylene safety

Why use a conformal coating drying cabinet?

Posted by Sean Horn on Mon, Aug 27, 2012 @ 08:45 AM

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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Tags: conformal coating, conformal coatings, conformal coating equipment, conformal coating solvents, drying cabinet, solvents

Conformal Coating Facility Setup: General Requirements

Posted by Sean Horn on Mon, Aug 06, 2012 @ 12:23 PM

We get a lot of requests from customers looking to keep their conformal coating an in-house process.  A lot goes into the conformal coating process, so it may be easy to overlook allThe coating room area should be clean and dust free since printed circuit boards are especially susceptible to particles sticking to the drying coating.  The temperature range should be reasonably controlled within the sensible limits since the visocity of the coating is dependent upon the temperature.  However, a more critical point than temperature is the humidty which needs to be controlled to be above 35% for ESD reasons and <55% due to moisture issues which can affect the coating integrity and the application method.
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Tags: conformal coating, conformal coatings, conformal coating solvents, consultation

Different ways to deal with solvents in conformal coatings

Posted by Sean Horn on Tue, May 29, 2012 @ 09:55 AM

Option 1: Regularly measure the solvent exposure to operators.

Solvents can be used safely.  However, the exposure of the operator to the solvent fumes must be REGULARLY measured and RECORDED. This ensures a safe operating environment and if an OSHA problem does arise in the future, evidence exists to rule out the conformal coating process as the culprit.

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Tags: conformal coating, conformal coatings, conformal coating process, conformal coating solvents, conformal coating service, safety, conformal coating safety, solvents