Diamond-MT's Blog

Should I add UV Trace to Parylene Coating?

Posted by Sean Horn on Fri, Feb 12, 2016 @ 08:00 AM

Conformal Coatings and UV Trace

Conformal coatings provide exceptional protection for printed circuit boards (PCBs) and similar electrical assemblies, through a wide variety of operating circumstances, safeguarding their chemical, electrical, and/or mechanical properties. 

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Tags: parylene, UV trace, UV light and parylene

Parylene Conformal Coatings and UV Light

Posted by Sean Horn on Fri, Feb 05, 2016 @ 07:54 AM

            Parylene has numerous outdoor applications.  However, a major drawback of most parylene types is limited resistance to direct contact with UV radiation.  Daylight is the most common source of UV light.  Prolonged exposure to its high energy radiation can cause objects extensive surface damage and lead to eventual malfunction of electrical light-generating assemblies within.  

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Tags: parylene, parylene for LEDs, parylene disadvantages, parylene f, parylene af-4

What Is the Proper Adhesion Test for Conformal Coating?

Posted by Sean Horn on Fri, Jan 29, 2016 @ 08:09 AM

You've done your research, chosen a conformal coating provider, and coated your device. Now you want to know if the coating properly adhered.

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Tags: conformal coating, parylene adhesion, conformal coating adhesion, adhesion testing

What’s the Difference Between Potting and Conformal Coating?

Posted by Sean Horn on Fri, Jan 22, 2016 @ 09:00 AM

Conformal coatings are a protective, non-conductive dielectric layer that are added to a circuit board or electronic device.

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Tags: parylene, conformal coating, potting

Parylene and A-174 Silane

Posted by Sean Horn on Fri, Jan 15, 2016 @ 07:41 AM

Improving Parylene Adhesion

Parylene provides an entirely conformal, durable, pinhole-free substrate coating of extreme utility for an exceptional range of materials, products and purposes. Despite its many advantages, parylene's chemical structure can actually interfere with the reliable interface adhesion required for optimal performance. The chemical vapor deposition (CVD) process that generates so many of parylene's benefits also nullifies chemically-based substrate adhesion; only mechanical adhesion is possible.

Implementing optimal adhesion can require surface modification via application of adhesion promoting agents or methods. The materials and processes used for these purposes are largely dependent on the substrate surface and component's specific operational environments and functions. Although most adhesion promotion methods are used prior to CVD, several can be integrated into the coating-process itself, Among the methods of adhesion promotion used with parylene are:

  • Thorough surface-cleaning, which stimulates enhanced adhesion by eliminating accumulated substrate contaminants whose presence can diminish overall coating quality.
  • Heat-treating. for three hours at temperatures of 140°C, beneficially activates longer-term adhesion and insulation.
  • Active, wired devices profit from bilayer component-encapsulation processes.

While these techniques have their uses for parylene adhesion promotion, the chemical monolayer Silane A-174 (3-Methacryloxypropyltrimethoxysilane - C10H20O5Si) is used most frequently to modify substrate surfaces and improve parylene adhesion.

The Uses of Silane A-174

Silane A-174's value as an adhesion promoting agent stems largely from its versatility. It can be successfully applied to substrate materials like elastomer, glass, metal, paper, plastic or quartz, among a wide range of surface substances. The A-174 silane molecule develops a robust chemical bond with the substrate, facilitating the improved surface adhesion capacity of parylene’s mechanical property. Optimal parylene adhesion is commonly achieved by a treatment with A-174 silane prior to initiating the CVD process. However, regarding appropriate procedural scheduling:

  • it is recommended that A-174's application be completed after any necessary masking operations have been finished;
  • depending on substrate materials, manual spray, soaking, or vapor phase silane processing techniques may be used to apply A-174.

Download our guide  on Parylene 101

Process Balance

While the silane promotes adhesion, the parylene assures protection. Thus, appropriately proportional intermixtures of silane A-174 and parylene need to be used, in all cases. Corrosion-resistance can be diminished where the relationship between parylene and silane is inexact, causing part and function deterioration from both beneath- and external to the conformal covering. This is especially the case with medical implants, where reliable component function is mandatory, despite being subjected to persistent exposure to often harsh bodily fluids.

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Tags: parylene, parylene adhesion, silane 1a74

Benefits of Conformal Coating

Posted by Sean Horn on Fri, Jan 08, 2016 @ 08:07 AM

Electronics manufacturers need devices that withstand heat, cold, rain, snow, vibration, fungus, oxidation, and corrosion through decades of operation.

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

Implantable Devices and Parylene

Posted by Sean Horn on Fri, Dec 18, 2015 @ 08:40 AM

Implantable Medical Devices and the Uses of Parylene

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Tags: parylene, implantable devices, medical devices, medical device coating

What's the Best Coating for MEMS?

Posted by Sean Horn on Fri, Dec 11, 2015 @ 07:59 AM

Defining MEMS

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Tags: parylene, Parylene and MEMS, MEMS

Ruggedizing Electronics with Parylene

Posted by Sean Horn on Fri, Dec 04, 2015 @ 08:00 AM

Ruggedized Products

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Tags: parylene, rugged electronics, COTS, ruggedization

How Long Does the Parylene Coating Process Take?

Posted by Sean Horn on Fri, Nov 20, 2015 @ 07:39 AM

Parylene Chemistry and Production Requirements

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Tags: parylene, parylene coating process, parylene uniformity