Diamond-MT's Blog

NADCAP Specifications for Conformal Coatings

Posted by Sean Horn on Fri, Jul 22, 2016 @ 07:30 AM

  The National Aerospace and Defense Contractors Accreditation Program

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Tags: conformal coatings, nadcap conformal coating, conformal coating specifications

Common Parylene Problems

Posted by Sean Horn on Fri, Jul 15, 2016 @ 07:30 AM

In addition to cracking, a range of associated issues may interfere with successful coating of parylene films.  Because it is applied via CVD, parylene generates a structurally continuous film covering a PCB or similar assembly.  In CVD, the interaction of vapor-phase chemical reactants formulate a non-volatile solid film on a substrate, useful for a variety of applications like corrosion resistance, erosion defense, and high temperature protection. 

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Tags: parylene, parylene process, parylene rework, parylene disadvantages, parylene issues

What Is the Price of Parylene Conformal Coating?

Posted by Sean Horn on Fri, Jul 08, 2016 @ 07:30 AM

Parylene is often considered the ultimate conformal coating for the protection of devices, components, and surfaces in the electronics, instrumentation, aerospace, medical, and engineering industries.

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Tags: parylene, parylene cost, parylene process, parylene dimer, parylene price

NASA Certified and Similarly Rated Conformal Coating Companies

Posted by Sean Horn on Fri, Jul 01, 2016 @ 07:30 AM

NASA certification is essential to aerospace conformal coating applications, and thus is sought after by many firms in the industry.  In addition to 8739.1, other NASA standards, such as ASTM E595 – a test developed by NASA to determine levels of coatings’ volatile content, appropriately screening low outgassing materials for use in space – are inspection and performance parameters applicable to aerospace uses. 

The AS9100/9120 and ISO9001 qualification are international aerospace standards for quality assurance, development, production, installation, and servicing also relevant to quality workmanship for aerospace products and the firms that manufacture them; equally relevant are IPC-CC-830 and IPC--A-610 classifications, from the Association Connecting Electronics Industries, often considered equivalent to NASA 8739.1 for aerospace conformal coatings.  Nadcap’s AC7120 Rev A - Nadcap Audit Criteria for Circuit Card Assemblies is also applicable. 

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Tags: NASA conformal coating, NASA-STD 8739.1A, conformal coating companies

Parylene and Silicone Conformal Coatings:  A Comparison

Posted by Sean Horn on Fri, Jun 24, 2016 @ 07:30 AM

One liquid coating type that rivals the use of parylene is silicone conformal coating (Type SR), which cures rapidly, is reliably dielectric and displays exceptional stability across a wide temperature range.  These properties make it parylene’s chief performance competitor, for many purposes.  Further comparison delineates their benefits and disadvantages relative to each other.

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Tags: parylene, silicone conformal coating, type xy, type sr conformal coating

NASA Inspection Criteria for Conformal Coating

Posted by Sean Horn on Fri, Jun 17, 2016 @ 07:30 AM

The Workmanship Standards developed by the National Aeronautics and Space Agency (NASA) are essential to assuring reliable performance of the aeronautic, defense and space equipment it uses and monitors.  

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Tags: parylene, conformal coating, NASA conformal coating, NASA-STD 8739.1A

How to Keep Parylene Coating Costs Low

Posted by Sean Horn on Fri, Jun 10, 2016 @ 07:30 AM


Designers must keep costs in mind when designing a project.

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Tags: parylene, parylene cost, parylene dimer, parylene disadvantages

Parylene C vs Parylene F

Posted by Sean Horn on Fri, Jun 03, 2016 @ 07:30 AM

Parylene C is the most widely used parylene type for conformal coatings.  It is classified as a poly-monochoro para-xylene, produced from dimer material, with one chlorine group per repeat unit on its main-chain phenyl ring.  As a conformal coating, Type C can be deposited at room temperature via CVD.  The resulting film exhibits low chemical, moisture, and vapor permeability, making it particularly useful where protection is needed from corrosive gases.  C’s alliance of electrical and physical properties distinguish it uses from those Parylene F, a consequence of their different chemical composition; F has a fluorine atom on its benzene ring, in contrast to C’s chlorine atom. 

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Tags: parylene, parylene C, parylene f

Comparing AR to UR Conformal Coating

Posted by Sean Horn on Fri, May 27, 2016 @ 07:30 AM

Acrylic (AR) and polyurethane (UR) conformal coatings are among the best known and most commonly used conformal coating materials.  As liquid coatings, both can be applied to substrates through a variety of methods:

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Tags: acrylic conformal coating, conformal coating, urethane conformal coating, coating comparison

The Impact of Temperature on Parylene Adhesion

Posted by Sean Horn on Fri, May 20, 2016 @ 07:30 AM

Basic Thermal Properties of Parylene Conformal Coatings 

CVD-generated parylene combines high thermal stability with a low dielectric constant, minimal moisture absorption, and other advantageous properties which sustain its adhesion to substrate surfaces.  Among the most beneficial of the parylenes’ thermal properties is their ability to function at an exceptional range of temperatures.  Depending on the parylene type, they are operative at temperatures as low as -271º C, and as high as 450º C, representing an ability to perform within a span of 721º C.  

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Tags: parylene, parylene adhesion, silane 1a74