Parylene Coating Blog by Diamond-MT

Parylene Conformal Coatings for Oil & Gas Sensors

Posted by Sean Horn on Fri, Nov 22, 2019 @ 08:00 AM

Parylene is a transparent polymer offering uniform and pinhole-free conformal coatings. Different varieties of parylene (Parylene N, C, D, AF4, and F) formed by a modification in their molecular structure. Each modification results in a set of material properties that are applicable in different service conditions. The basic type of parylene derivatives is the Parylene N (poly-para-xylylene) monomer.

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Tags: parylene, parylene coating process, sensors, oil and gas

Corrosion Protection with Parylene

Posted by Sean Horn on Fri, Aug 23, 2019 @ 08:00 AM

A natural process, corrosion enacts chemical/electrochemical reactions that degrade and gradually destroy materials or components within a functional environment.  The outcome can be dangerous and costly to repair.  

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Tags: parylene, parylene coating process, parylene properties

Crevice Penetration of Parylene

Posted by Sean Horn on Fri, Oct 19, 2018 @ 07:30 AM

Parylene (XY) polymers provide robust, dielectric, micron-thin conformal coatings for a considerable range of electronic devices, most prominently printed circuit boards (PCBs).  XY’s unique chemical vapor deposition (CVD) application method synthesizes in-process, depositing gaseous parylene deep into a substrate’s surface.  CVD occurs on a molecule-by-molecule basis, conforming to all underlying contours, regardless of shape or position, to the nanometer, if necessary.  Pre-synthesized liquid coatings lack many of parylene’s performance properties, having far less ability to successfully and conformally penetrate crevices in the substrate

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Tags: parylene coating process, parylene properties, conformal coating properties

Parylene Coating Measurement Methods

Posted by Sean Horn on Fri, Oct 05, 2018 @ 07:30 AM

 Used as moisture and dielectric barriers, polymer parylene (p-xylylene/XY) coatings are conformal and pinhole free.  Applied by a unique chemical vapor deposition (CVD) method, parylene penetrates beneath substrate facades, simultaneously attaching above surfaces at the molecular level.  CVD generated films cover crevices, exposed internal regions, points and sharp edges uniformly, without gaps or breaches.  Compared to liquid coating materials – acrylic, epoxy, silicone and urethane -- XY film layers are micron-thin, enhancing their utility for microelectricalmechanical systems (MEMS) and nano technology (NT). 

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Tags: parylene coating process, parylene thickness, conformal coating inspection

Elongation Properties of Parylene

Posted by Sean Horn on Fri, Sep 07, 2018 @ 03:04 PM

For conformal coatings, elongation is a measure of material ductility -- a specific coating's ability to undergo significant plastic deformation before rupture.  A coating’s yield elongation is the maximum stress the material will sustain before fracture.  Thus, computed parylene (XY) elongation measurements represent the total quantity of strain the conformal film can withstand before failure.  While elongation is equal to a material’s operating failure strain, it has no exclusive units of measurements.  Typically,

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Tags: parylene coating process, parylene process, parylene properties

What Temperature is Parylene Applied At?

Posted by Sean Horn on Fri, Aug 03, 2018 @ 07:30 AM

Parylene (XY) conformal coatings are applied to substrate materials through a specialized chemical vapor deposition (CVD) process that completely eliminates the liquid phase of wet coatings.  No initiators or catalysts are involved in CVD polymerization, which synthesizes truly conformal protective film in-process.  This is in stark contrast to wet coating materials such as acrylic, epoxy, silicone and urethane, which are synthesized prior to application via, brush, dip or spray methods.  Wet during application, liquid-coated substrates requiring further drying and curing.

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Tags: parylene coating process, parylene process, parylene deposition

Can I Solder through Parylene?

Posted by Sean Horn on Fri, Jul 20, 2018 @ 07:30 AM

Parylene:  Properties and Processes

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Tags: parylene coating process, parylene properties, parylene rework

Inspecting Parylene Coating

Posted by Sean Horn on Fri, Apr 13, 2018 @ 07:30 AM

Parylene conformal coating (XY) provides insulative protection for complex electronic circuit assemblies expected to function through rigorous operating conditions -- potential chemical, electrical, moisture and vapor incursion during performance.   Applied through chemical vapor deposition (CVD), parylene penetrates deep within substrate surfaces, generating a level of assembly security surpassing that offered by liquid coatings such as acrylic, epoxy, silicone and urethane.  Yet, although XY is applied in a vacuum, it’s capacity to provide these extraordinary qualities does not exist in one.  Parylene’s durable protective value depends on film adhesion, a quality subject to persistent, thorough inspection throughout the production process.

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Tags: parylene coating process, parylene process, parylene inpsection

How Long Does the Parylene Coating Process Take?

Posted by Sean Horn on Fri, Nov 20, 2015 @ 07:39 AM

Parylene Chemistry and Production Requirements

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Tags: parylene, parylene coating process, parylene uniformity

Managing Parylene Adhesion

Posted by Sean Horn on Tue, Sep 10, 2013 @ 10:39 AM

It is imperative to obtain proper adhesion of the coating to the substrate in order to truly reap the benefits of parylene conformal coating. Poor parylene adhesion, after all, can negate some of parylene's most-prized properties, including corrosion resistance, chemical resistance, moisture resistance, and dielectric strength. So, it's in an engineer's best interest to understand the importance of parylene adhesion and how to obtain it.

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Tags: parylene, parylene coating process, parylene adhesion