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

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

Top 5 Myths of Parylene

Posted by Sean Horn on Fri, Jun 08, 2018 @ 07:30 AM

Although parylene (XY) is a well-recognized and often used conformal coating, misconceptions about what it is and can do are common.  These mistaken beliefs interfere with true understanding of parylene’s uses.  Five of the most consistent misconceptions – and appropriate corrective information – should clear things up.

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Tags: parylene, parylene properties, parylene disadvantages

Parylene Barrier Properties

Posted by Sean Horn on Fri, Jun 01, 2018 @ 07:30 AM

Permeation barriers for electronic devices are essential to assure their ongoing performance through a wide range of operational environments.  Polymer flexible conformal coatings provide good barrier protection, protecting device substrates from unwanted incursion by solid contaminants, chemicals, gaseous permeation and liquid water or vaporous forms of moisture.  Permeability reduction improves with enhanced coating adhesion, minimizing the surface’s  

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Tags: conformal coating properties, parylene properties, parylene

What can be Coated: Conformal Coatings and Parylene Compared

Posted by Sean Horn on Fri, Mar 23, 2018 @ 08:02 AM

Conformal coatings are used to protect printed circuit boards (PCBs) from dust, humidity/moisture, mildew/mold, temperature extremes, and other elements whose prolonged contact might interfere with assembly function. Coatings also enhance electrical clearance-tolerance, while safeguarding PCB components from contamination (particulate or otherwise), corrosive materials, and mechanical stress.

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Tags: conformal coatings, parylene, conformal coating applications

Review and Summary of Michael Osterman’s “Effectiveness of Conformal Coat to Prevent Corrosion of Terminals”

Posted by Sean Horn on Fri, Feb 23, 2018 @ 07:28 AM

Originally published in the IPC Proceedings, the article “Effectiveness of Conformal Coat to Prevent Corrosion of Terminals“ was published online by circuit insight (http://www.circuitinsight.com/programs/54223.html). Author Michael Osterman is affiliated with the Center for Advanced Life Cycle Engineering, University of Maryland (College Park, MD).

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Tags: parylene

Different Coatings for Electronics

Posted by Sean Horn on Fri, Jan 26, 2018 @ 07:18 AM

The value of polymeric conformal coatings for protecting printed circuit boards (PCBs) from functional retardants like dust, corrosion, moisture, and temperature fluctuations is well-known. What may be less known is, that as the electrical components used in PCBs become smaller, traditional conformal films are commensurately less effective for certain coating purposes. With the rise of microelectricalmechanical systems (MEMS) and nano technology, nanocoats are increasing in prominence, in many cases surpassing even micro-thin parylene not-liquid coatings in utility for MEMS/nano applications.

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Tags: nano coating, parylene

Ruggedization and Conformal Coating

Posted by Sean Horn on Fri, Jan 05, 2018 @ 07:35 AM

Conformal coatings are non-conductive dielectric film-coverings applied over printed circuit boards (PCBs) to protect them from damage caused by chemical incursion, corrosion, current-leakage, dirt/dust, extreme temperatures, fungus, moisture, rain, salt-spray, wind and persistent, intensive vibrations both within and external to the device. These failure mechanisms can soon lead to PCB malfunction and eventual breakdown. Rugged coatings’ exceptional performance durability and versatility protect delicate, finely-tuned components.

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Tags: rugged electronics, ruggedization, acrylic conformal coating, parylene conformal coating, parylene