Parylene Coating Blog by Diamond-MT

Best Electronics Coatings

Posted by Sean Horn on Fri, Nov 17, 2017 @ 08:01 AM

Available in five basic material types, conformal coatings can be readily adapted as protective, insulating films for electronics. However, there can be some confusion about which type is best-suited for a specific use. Clearly defining the performance parameters for the component[s] to-be-coated helps coordinate the conformal film material with a unit’s functional requirements. Accurate assessment of environmental conditions like anticipated levels of corrosion, contact with foreign particulates, expected concentrations of moisture/salt spray, temperature fluctuations and vibrational range determine which coating type is best-suited to your electronics’ applications. Without appropriate protection, printed circuit boards (PCBs) and similar electronics will not survive harsh environments, and malfunction.

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Tags: acrylic conformal coating, parylene, silicone conformal coating, urethane conformal coating, rugged electronics, electronics, epoxy conformal coating, ruggedization, conformal coating selection, electronic conformal coatings

Conformal Coating Selection

Posted by Sean Horn on Thu, Jul 25, 2013 @ 02:23 PM

Conformal Coating Selection: Weighing the Pros and Cons for Your Application

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Tags: acrylic conformal coating, parylene conformal coating, conformal coating, silicone conformal coating, urethane conformal coating, epoxy conformal coating

Using Conformal Coating to Prevent Reverse Engineering

Posted by Sean Horn on Tue, Aug 07, 2012 @ 12:54 PM

Conformal Coatings are used regularly in an attempt to cover technology designs on printed circuit boards (PCBs). Normally, this is done by using a pigmented (coloured) conformal coating which obscures the components below the conformal coating material.

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Tags: conformal coating, conformal coatings, urethane conformal coating, conformal coating removal, Nexus3C, epoxy conformal coating, reverse engineering

When Not to Use Acrylic Conformal Coating

Posted by Sean Horn on Wed, May 16, 2012 @ 07:52 AM

While acrylic conformal coating does have its many benefits, there are some applications whenever it is not the ideal conformal coating  to be using.  Typically in applications that have exposure to solvents, high temperature requirements, or require coating hardness, acrylic conformal coating should not be used.

 Solvent exposure

 In applications that have an exposure to solvents, acrylic conformal coating is not the best choice.  Acrylic conformal coating can be removed with a weaker solvent such as isopropyl alcohol or xylene.  Whenever it faces even stronger solvents, it will not offer the protection that is needed, especially if your product is a mission critical device.  Other coatings, such as urethane or parylene conformal coating have a far better resistance to solvents than acrylics.

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Tags: acrylic conformal coating, parylene conformal coating, conformal coating, silicone conformal coating, conformal coatings, HumiSeal 1B31, urethane conformal coating, HumiSeal, epoxy conformal coating

Benefits of Conformal Coatings

Posted by Sean Horn on Mon, Apr 30, 2012 @ 08:22 AM

Whenever a potential project that could benefit from a conformal coating application is discussed, the benefits of conformal coating need to be addressed.  By looking at the benefits of each different coating, you can see which coating will be right for your project.


Conformal coating is a protective non conductive dielectric layer that is applied to protect the assembly from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments.  


There are 5 different mediums for conformal coating:
  • Parylene
  • Acrylic Resin
  • Urethane Resin
  • Epoxy Resin
  • Urethane Resin


  • Parylene (Type XY)
Parylene possesses superior chemical barrier properties, are biochemically inert, and because of the deposition process can be applied uniformly to virtually any surface and shape including: glass, metal, paper, resin, plastics, ceramics, ferrite and silicon.
  • Acrylic Resin (Type AR)
Acrylic conformal coatings are easily applied. They dry to the touch at room temperature in minutes, have desirable electrical and physical properties, and are fungus resistant.
  • Epoxy (Type ER)
Epoxy systems are usually available as “two-component” compounds. These rugged conformal coatings provide good humidity resistance and high abrasion and chemical resistance.
  • Polyurethane (Type UR)
As a group, all provide excellent humidity and chemical resistance plus outstanding dielectric properties for extended periods.
  • Silicone (Type SR)
Silicone conformal coatings are particularly useful for high temperature service, up to about 200 deg. C. They provide high humidity and corrosion resistance along with good thermal endurance.
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Tags: acrylic conformal coating, parylene conformal coating, conformal coating, silicone conformal coating, urethane conformal coating, epoxy conformal coating