Blog

Improve Precision and Reduce Time When Removing Conformal Coatings

Posted by Vlad David on May 21, 2018 11:00:00 AM

UV curable conformal coating materials such as HumiSeal UV40 are frequently used in military, aerospace and automotive applications due to superior resistance to chemicals and mechanical stress. These properties make them difficult to remove when rework under the coating is required.

There are products available for chemical removal of conformal coatings, but many are restricted by government regulation and health and safety concerns.

An effective method for localised removal of conformal coatings, allowing the rework of the components, is the powder or micro-abrasion equipment.

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Topics: Micro Abrasion, conformal coating application, conformal coating removal

5 Simple Steps to Eliminate Bubbles in Potting Encapsulants

Posted by Humiseal Editor on Apr 16, 2018 11:00:00 AM

Encapsulant solutions are commonly used to enhance protection of circuit boards from environmental and liquid contaminants, chemical attack, and electrical shortages. While potting materials provide many positive attributes when used to protect PCBs, sometimes other issues arise during and post application of these compounds. This blog focuses on “bubbles” forming within the encapsulant itself.

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Topics: Humiseal, Encapsulants

A Quick Guide to Understand IPC-CC-830B Qualification Standard

Posted by Vlad David on Mar 28, 2018 11:30:00 AM

IPC CC-830 revision B is a conformal coating qualification standard mostly used by board fabricators, OEM design engineers, and coatings suppliers.  

There are two fundamental uses of this IPC standard:

  • Coatings’ performance capabilities
  • Quality consistency

In this blog, we will go over some of the specifications along with tests requirements, passing criteria, and quality characteristics.

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Topics: Conformal Coatings, Conformal Coating Process, Standard Qualifications, IPC-CC-830B

How to Save Time & Money Measuring the Right Amount of Viscosity

Posted by Rafael Hernandez on Mar 14, 2018 10:30:00 AM

The conformal coating process, like any other processes, has different variables, inputs, and outputs. In order to be able to control the results of your application (outputs), we need to fully understand how each variable affects the process. 

The importance of the variables

To get the right amount of liquid, thickness, right coverage, no contamination on keep out areas, etc., you need to identify and understand the variables of the process.

The most important variables:

  • Viscosity
  • Flow
  • Machine parameters (speed and Height)
  • Curing method

In this blog, we will concentrate on reviewing the first variable: Viscosity

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Topics: Conformal Coatings, conformal coating application, viscosity

How Best to Protect PCB Mounted Components from Vibration

Posted by Albert Hernandez on Feb 26, 2018 1:00:00 PM

Electronics continue to be placed into harsher environments, and PCB component vibration dampening remains a challenge for many industries. When the solder connection strength is not going to be sufficient to withstand years of vibration, there is a solution: staking materials.

Numerous fields of industry manufacture products that are prone to high-vibration environments. Some of them are:

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Topics: Adhesive Solutions, Vibration Suppression

Tired of Masking?  Try Selective Dip Coating

Posted by David Greenman on Feb 6, 2018 11:10:00 AM

When conventional coating methods such as hand spray, total dipping or robotic selective coating don’t provide the protection required, there is always selective dip coating.

What is selective dip conformal coating?

Selective dip coating is a process whereby the substrate rather than globally immerised in the coating, is discreetly coated in desired locales.  The technique in one form or another, has been around for over 25 years and is used with both classic solvent-based coatings and 100% UV cure conformal coatings.

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Topics: Conformal Coatings, Humiseal, Selective Dip Coating, Electronic Protection

Simple Steps to Ensure Proper Wetting & Good Adhesion

Posted by Monika Dybalska on Nov 20, 2017 11:00:00 AM

Have you ever seen your conformal coating separate or de-wet?  Have you observed the conformal coating to flake off after cure? The key to your success is understanding the relationship between surface energy (of the substrate) and surface tension (of the conformal coating).  There are some simple steps you can take to help ensure you possess a healthy balance of both.

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Topics: Humiseal, Conformal Coating Process, proper wetting, troubleshooting, surface energy, conformal coating application

What is a Wet Gauge and How to Measure Conformal Coating Thickness?

Posted by Vlad David on Oct 10, 2017 11:00:00 AM

The application of the conformal coating in a uniform and consistent coverage is a key challenge that defines the reliability of the finished product.

A thin coating will provide inadequate protection against corrosion or insulation between conductors. Conversely, if the conformal coating is too thick, it will increase the risk of forming other types of coating defects such as bubbles, insufficient curing, and potential cracking during thermal shock cycles.

Besides the verification of the process parameters such as coating viscosity and the application method is correctly setup, the amount of conformal coating material applied on the printed circuit boards can be measured before curing. For this, wet film conformal coating thickness gauges are used. This method ensures quality control while the coating material is still wet.

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Topics: Conformal Coatings, Coating Application Preparation, Conformal Coating Process

The Importance of Air Quality in Conformal Coating Process

Posted by Rafael Hernandez on Sep 26, 2017 10:51:32 AM

One of the basic components used in most automatic or semi-automatic conformal coating processes is compressed air.  Pressurized air moves the liquid coating from the tank, through the hoses and the valves onto the PCB.  Since the pressurized air makes direct contact with the conformal coating, there are critical properties that must be taken into consideration, especially with moisture sensitive materials. What critical factors are important when working with UV40, UV500, 1A20 or any RTV Silicone from HumiSeal? 

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Topics: silicone conformal coating, Conformal Coatings

3 Simple Ways to Remove HumiSeal UV Conformal Coatings

Posted by Matt Eveline on Aug 15, 2017 11:00:00 AM

This blog post outlines the techniques required for the removal of HumiSeal UV cure conformal coating. The products covered in this article are:

  • UV40, UV40-250
  • UV50LV
  • UV500, UV500LV

There are 3 methods for the removal of HumiSeal UV conformal coatings:

  1. Mechanical removal: Powder Micro Abrasion
  2. Thermal removal: Burn Through
  3. Chemical removal

All three methods will effectively remove the coating, depending on the process requirements, to allow individual component replacement and subsequent re-coating.

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Topics: Conformal Coatings, Humiseal, Micro Abrasion