Parylene Coating Blog by Diamond-MT

Is Parylene Hydrophobic?

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

Hydrophobic Basics and Hydrophilicity

Read More

Tags: parylene, parylene properties

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. 

Read More

Tags: parylene process, parylene properties, parylene rework

Can I Solder through Parylene?

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

Parylene:  Properties and Processes

Read More

Tags: parylene coating process, parylene properties, 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

Read More

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

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:

Read More

Tags: parylene, parylene properties, parylene inpsection

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.

Read More

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  

Read More

Tags: parylene, parylene properties, conformal coating properties

Parylene Coating:  Does Thicker or Thinner Coating Provide Better Performance?

Posted by Sean Horn on Fri, May 25, 2018 @ 07:30 AM

          Parylene (XY) conformal coatings are known and recommended because of their many beneficial performance characteristics.  They provide uniform, pinhole-free protective films with excellent barrier/dielectric/insulative properties, able to conform to virtually any substrate configuration.  One property in particular – micron-thin coating layers – distinguishes XY from liquid coating materials such as acrylic (AR), epoxy (ER), silicone (SR) and urethane (UR), which need to be applied at least twice as thick in most cases and frequently more, limiting their range of uses.  Parylene typically is applied at 0.1 to 50 microns (0.004 -2 mils), while the thicknesses of liquid coatings generally range from 25 to 250 microns (1-10 mils).  Compared to liquid processes, gravity and surface tension generate negligible impact with parylene, eliminating film bridging, pinholes, puddling, run-off, sagging or thin-out during application.  XY’s coefficient of friction coefficient can be as low as 0.25 to 0.30.

Read More

Tags: parylene properties, conformal coating thickness, parylene thickness, conformal coating properties

Conformal Coatings Thickness:  Comparing Parylene with Liquid Coatings

Posted by Sean Horn on Fri, May 18, 2018 @ 07:30 AM

          Of the five most commonly used conformal coatings, four – acrylic (AR), epoxy (ER), silicone (SR) and urethane (UR) – are classified as wet materials, meaning they are applied to substrates by three basic types of liquid-based technology:

Read More

Tags: parylene properties, conformal coating thickness, parylene thickness, conformal coating properties

Parylene Effectiveness at Different Thicknesses

Posted by Sean Horn on Fri, May 04, 2018 @ 07:30 AM

          Each conformal coating material exhibits a range of unique performance properties that determine its product uses.  Relevant factors include the required coating-thickness necessary to assure reliable performance.  Like other coating types, parylene (XY) layer thickness is largely a function of several factors:  (1) substrate material, (2) the kind of assembly being covered, and (3) its operational purpose.  Chemically inert parylene is effective at far-thinner application thickness than liquid-applied materials for coating printed circuit boards (PCBs) and related electro assemblies: 

Read More

Tags: parylene properties, conformal coating thickness, parylene thickness, conformal coating properties