Parylene Coating Blog by Diamond-MT

Effects of Adhesion Promotion on Sensors

Posted by Sean Horn on Fri, Oct 26, 2018 @ 07:30 AM

Sensors measure specific aspects of data-driven technology.  Included are such performance properties as acceleration, fluidity, humidity/temperature, position, pressure or vibration.  Sensors collect data  and respond with feedback for a multitude of electronic devices utilizing printed circuit boards (PCBs) and related sensitive electronics.  They have been successfully adapted for use across a wide range of applications, including aerospace/military, appliance, automotive, communications, consumer, industrial, medical and transportation uses.  

PCBs and the larger devices they power often need to function in harsh operating environments.  Conformal coatings -- liquid acrylic, epoxy, silicone and urethane resins, and chemical vapor-deposited (CVD) parylene – provide PCBs and similar electronics excellent barrier, dielectric and insulative protection through most performance conditions, sustaining their expected utility.  Substrate adhesion is necessary to conformal film reliability; coatings do not work if they delaminate or otherwise disengage from the components they are applied to protect. 

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Tags: parylene inpsection, parylene adhesion, sensors

Does Parylene Prevent Abrasion Damage?

Posted by Sean Horn on Fri, Jul 06, 2018 @ 07:30 AM

 Unlike liquid coatings – acrylic, epoxy, silicone and urethane – parylene (XY) does not use wet method application.  It can neither be brushed or sprayed onto substrate surfaces, nor will immersion – soaking the substrate in a bath of coating material – work.  In addition, XY’s:

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Tags: parylene inpsection, parylene properties, parylene

In-Line Parylene Processing??

Posted by Sean Horn on Fri, Jun 29, 2018 @ 07:30 AM

The phrase “in-line parylene processing" is deceptive  because it does not accurately describe the method in which parylene (XY) is applied as a conformal coating.  It is true that some aspects of the traditional production line are relevant, but primarily in a fractional way. without the traditional station-to-station regimentation of standard in-line manufacturing processes.

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Tags: parylene process, parylene inpsection, parylene applications

Does Parylene Get Everywhere?

Posted by Sean Horn on Fri, Apr 27, 2018 @ 07:30 AM

After pertinent research you’ve determined parylene (XY) is the best conformal film for your coating assignment.  Especially relevant were XY’s uniform protective and insulative properties, which are useful for numerous applications, ranging from printed-circuit boards (PCBs) to medical implants to military-grade purposes.  Among parylene’s other advantages are: 

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Tags: parylene properties, conformal coating inspection, parylene inpsection

Does Parylene De-Wet?

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

Liquid conformal polymers – resins of acrylic (AR), epoxy (ER), silicone (SR) and urethane (UR) – use wet application processes to attach to substrates.  Most prominent of these are brushing the wet coating onto an assembly, dipping (immersing) the assembly in a bath of liquid coating, or spraying the conformal film onto the designated surface.  The coating materials are wet when they are applied.  If

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Tags: parylene inpsection, parylene properties, conformal coating properties

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 inpsection, parylene process, parylene coating process

Are Parylene Noodles a Defect?

Posted by Sean Horn on Fri, Apr 06, 2018 @ 07:30 AM

Unlike liquid conformal coatings joined to substrate surfaces by wet application methods, polymeric parylene (XY) uses a unique chemical vapor deposition (CVD) process to assure adherence.  There is no intermediate liquid phase.  Rather, cross-link polymerization of powdered raw XY-dimer converts the solid to a vapor at the molecular level, polymerizing XY directly as a transparent film on assembly surfaces.

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Tags: parylene inpsection, conformal coating defects, parylene properties