Diamond-MT's Blog

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

9 Questions to Ask About Contamination, Cleaning, Failures, and Defects in Conformal Coating

Posted by Sean Horn on Fri, May 13, 2016 @ 07:30 AM

How do you ensure that a potential conformal coating provider has the professional credentials and expertise necessary to avoid costly mistakes?

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Tags: conformal coating, conformal coating service, conformal coating issues, conformal coating bubbles, conformal coating defects

How to Test Parylene Adhesion

Posted by Sean Horn on Fri, May 06, 2016 @ 07:30 AM

The Need for Adhesion Testing

Applied mechanical processes stimulate the binding force between surface molecules required for parylene adhesion to substrates, which is essential to both good parylene performance and assembly/component functionality.  The emergence of conditions characterized by non-adherence and delamination squander parylene’s typically exceptional substrate protection against chemical attack, corrosion and moisture, as well as its superior dielectric insulation (er = 3.1).  

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Tags: parylene, parylene adhesion, parylene adhesion testing

What if my Conformal Coating is Applied too Thick?

Posted by Sean Horn on Fri, Apr 29, 2016 @ 07:30 AM

Coating thickness is critical to the proper functioning of your printed wiring assembly, circuit board, or electronic device.

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Tags: conformal coating, conformal coating thickness, conformal coating removal

How to Improve Parylene Adhesion to Noble Metals

Posted by Sean Horn on Fri, Apr 22, 2016 @ 07:00 AM

Characteristics of Noble Metals

Selecting the appropriate pre-treatment procedures is a key factor to this success of parylene adhesion to any substance.  Procedures vary quite considerably, according to the materials designated for conformal coating and substrate.  Chemically inert surfaces like gold, silver and other noble metals, and nonpolar thermoplastics such as parylene, are extremely difficult to bond; they require additional surface treatments besides cleaning.  

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Tags: parylene, parylene adhesion, silane 1a74

How to Avoid Bubbles in Conformal Coating

Posted by Sean Horn on Fri, Apr 08, 2016 @ 07:54 AM

Bubbles and foam are two of the leading causes of failure during conformal coating inspections. Because of this, it’s worth looking at these defects more closely.

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Tags: conformal coating, conformal coating bubbles, conformal coating defects

Does Parylene Adhere Chemically?

Posted by Sean Horn on Fri, Apr 01, 2016 @ 08:10 AM

            Parylene only adheres to substrates mechanically, and this can require assistance from additive substances; parylene’s chemically-based adherence is nonexistent.  Adhesion is a consequence of molecular attraction stimulating the surface unification of two dissimilar substances; their joining creates a significant physical bond between them.  Of the two primary types of adhesion, chemical adhesion results when a compound joins with another, because they share sufficient mutual chemical interaction to form a bond with each other.  Because parylene is chemically inert, chemical adhesion is impossible; it adheres using the other method -- mechanical adhesion.  Applied mechanical processes can stimulate this binding force between surface molecules.   

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Tags: parylene, parylene process, parylene adhesion

UV-Cure Touchup and Parylene Coating

Posted by Sean Horn on Fri, Mar 25, 2016 @ 07:39 AM

A photochemical process used to preserve conformal coatings, adhesives, and inks, UV curing generates a variety of value-added properties in comparison to conventional curing techniques.  Applying high-intensity UV light to dry (cure) coatings or other substances, UV curing can provide instant results, increasing production speed while reducing the need for and number of typical set-up and clean-up processes.  Lowered operating costs and increased production capacity are further advantages of UV curing for many coating materials and processes. 

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Tags: parylene, parylene for LEDs, UV light and parylene

6 Conformal Coating Defects (And How to Best Avoid Them)

Posted by Sean Horn on Fri, Mar 18, 2016 @ 10:21 AM

Conformal Coatings are polymeric materials used to protect circuitry, parts, and related components. They are most commonly used to protect printed circuit boards (PCBs) and electronic devices.

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Tags: conformal coating, conformal coating rework, conformal coating costs, conformal coating bubbles, conformal coating defects