Parylene Coating Blog by Diamond-MT

Does Parylene Make my Product Waterproof?

Posted by Sean Horn on Fri, Aug 24, 2018 @ 07:30 AM

Protecting printed circuit boards (PCBs) and similar electronics from the incursion of water is an essential responsibility of parylene (XY) conformal coating.  Suitable XY permeation barriers assure no form of liquid passes through to underlying components and that the water vapor transmission rate (WVTR) is minimal.  WVTR measures the level of water vapor migration through the applied barrier film, in terms of area and time.  Optimal WTVR ratings are represented by lower numerical values.  In comparison to liquid coatings, parylene typically provides lowest-level values, indicating better moisture barrier provision.  

Acrylic, epoxy, silicone and urethane coatings can be more quickly affected by water, its vapor, and other sources of moisture, such as: 

  • acid rain,
  • mists of other airborne pollutants,
  • salt-air and
  • chaotic weather.
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Tags: parylene, parylene properties, parylene uniformity

Is Parylene a Nanocoat?

Posted by Sean Horn on Fri, Aug 17, 2018 @ 07:30 AM

          As the electrical components used to power printed circuit boards (PCBs) grow smaller, conventional conformal films become less effective for coating them.  Ongoing development of microelectricalmechanical systems (MEMS) and nano technology (NT), has little room for the thicker conformal films provided by liquid materials, such as acrylic, epoxy, silicone and urethane.   Nanocoats (NCs) are increasing in prominence, frequently surpassing micro-thin parylene (XY) for many MEMS/NT purposes.  

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Tags: parylene, parylene properties, nano coating

Is Parylene Hydrophobic?

Posted by Sean Horn on Fri, Aug 10, 2018 @ 07:30 AM

Hydrophobic Basics and Hydrophilicity

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Tags: parylene properties, parylene

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 process, parylene deposition, parylene coating process

Can I Glue to Parylene?

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

With reliable moisture barrier properties, parylene (XY) conformal coatings generally have a hydrophobic surface when deposited onto substrates, causing liquids to form separate droplets on film surfaces.  While this outcome is useful for many XY applications, greater hydrophilic response, wherein XY molecules form ionic or hydrogen bonds with water molecules, can also be desired.  This can be achieved by applying glue or epoxy on top the deposited parylene; surfaces acquire enhanced hydrophilic properties, becoming more wettable. 

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Tags: parylene properties, parylene process, parylene rework

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 properties, parylene coating process, parylene rework

Will Parylene Pass a Taber Test?

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

Taber tests are designed to measure a material’s capacity to withstand abrasion and its effects during operation.  Conformal coatings – both liquid and parylene (XY) – are

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Tags: parylene properties, parylene adhesion testing, parylene delamination, parylene disadvantages

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

Nonconformity of Parylene on Wafers

Posted by Sean Horn on Fri, Jun 22, 2018 @ 07:30 AM

          The polymer parylene (XY) provides exemplary, ultra-thin conformal coating for printed circuit boards (PCBs), solar cells, light emitting diodes (LEDs), medical implants, aeronautical/military equipment and numerous other products, with uniform, insulative protection in the nanometer (nm.) range

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Tags: MEMS, Parylene and MEMS, parylene uniformity