Diamond-MT's Blog

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.

Read More

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.  

Read More

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.

Read More

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.   

Read More

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. 

Read More

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.

Read More

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

Surface Treatments Prior to Parylene Coating

Posted by Sean Horn on Fri, Mar 11, 2016 @ 08:07 AM

Pre-coating Essentials

Poor parylene adhesion negates many of the coating’s most-valued functional properties, including dielectric strength, and resistance to the effects of chemicals, corrosive agents, and moisture.  Surface treatments that amplify the interface adhesion between the deposited parylene and the coated substrate are therefore highly desirable.  These treatments entail depositing parylene on a clean hydrophobic surface before its chemical vapor deposition (CVD) process is enacted.

Read More

Tags: parylene, parylene masking, parylene adhesion, silane 1a74, surface prep

Parylene for LEDs

Posted by Sean Horn on Fri, Mar 04, 2016 @ 08:00 AM

LED Lifespan as Effected by UV Light

Although LEDS are designed to provide as many as 100,000 hours of illumination under laboratory conditions, they are not nearly as resilient when subjected to persistent real-world, real-time usage.  Sensitive to electrical interference, moisture, UV light, and other persistent sources of physical damage, LEDs require protection to operate at levels anywhere near maximum efficiency.  Of all the conformal coatings available to deliver reliable safeguards on an ongoing basis, none surpasses parylene.

Read More

Tags: parylene, LED conformal coating, parylene for LEDs, UV light and parylene

Causes of Parylene Delamination

Posted by Sean Horn on Fri, Feb 26, 2016 @ 08:39 AM

Delamination Problems of Parylene Conformal Coatings

Providing a uniform and pinhole-free substrate coating that is ultra-thin, lightweight and durable, parylene coatings completely conform to targeted components and assemblies.  Parylene CVD generates a structurally continuous film that, with appropriate pre-treatment, penetrates deep within substrate surfaces, rather than simply attaching themselves to substrates as liquid-application coatings do.  These provide effective, dielectrically efficient safeguards with coatings as thin as a fraction of a micrometer.   Parylene is chemically and biologically inert and stable, an excellent barrier material to abrasive chemicals, bodily fluids, solvents, liquid water and water vapor.

Read More

Tags: parylene, parylene adhesion, parylene delamination, parylene issues

Does My Product Need to Be Clean Before Conformal Coating?

Posted by Sean Horn on Fri, Feb 19, 2016 @ 08:33 AM

Once you've decided to use conformal coating for your device, a question that often comes up is:

Read More

Tags: parylene, conformal coating, cleaning