What is the right removal process for conformal coating removal?

There are several reasons why a conformal coating may need to be removed from a printed circuit board or component.

However, the two main reasons I normally see are:

  • The board or component may need to be reworked for electrical repair or improvement of functionality
  • Poor conformal coating application has led to the requirement to repair the material and reapply the coating

Whatever the reason for removing the conformal coating the process is a challenge.

Whether it has been a localised repair to a component or a complete strip of the conformal coating it has always been difficult for the unlucky technician stuck with the job.

Manual conformal coating removal 500.jpg


What are options for conformal coating repair and removal?

There are several main methods now available for both localised repair and complete stripping of the conformal coating.

These include:

  • Soldering through the coating
  • Chemical stripping of the material
  • Mechanical abrasion with a tool like a blade
  • Micro abrasion using particulates to “shot blast” the coating
  • Plasma processing using a plasma gas for removal

So which is the right removal process for conformal coating?

None of the options are perfect.

All of them have there advantages and disadvantages. The key is to review the circuit board and its needs on an individual basis.

Some of the factors that influence the conformal coating removal process include:

  • Conformal coating material type
  • The size of the area to repair
  • The components sensitivity to the repair process (will they get damaged?)
  • The cost of the repair versus the value of the circuit board
  • The health and safety implications to the operator carrying out the repair

All of these factors and more can influence the choice or even whether the operation takes place.

After all, the cost of most electronics nowadays can be so low that the repair process is not cost effective!

To find out more go to the Nexus eBook section on conformal coating removal or contact us directly and we can help.


Need help with your conformal coating process?

Contact Nexus now and let us show you how we can help you.


Dr Lee Hitchens, Author of Nexus website and ebook

Dr Lee Hitchens is the Author of the Nexus eBook and a main contributor to Nexus.

 

 

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Our five most popular areas in the Nexus conformal coating eBook

People come to the Nexus eBook for several reasons.

Looking at our visitor statistics most people go to the following five sections:

  1. Designing for conformal coating
  2. Troubleshooting your conformal coating process
  3. The basics of conformal coating
  4. Conformal coating removal
  5. How to select a conformal coating material

Click on each to find out more about the five most popular conformal coating areas.

Nexus Series of Webinars: Conformal Coating Rework, Repair and In Process Application

Nexus are to hold a series of webinars on conformal coating topics in the Autumn of 2012.The series of four online conformal coating webinars will cover the following topics and each last 90 min. The last of the online training webinars will be:

Rework, Repair & In Process Application
Monday 4th February Rework of coating boards is a skilled job to obtain the optimum product reliability. Different materials or thicker coating may require different techniques to maintain the same reliability provided by the original coating system. It’s not always possible to use the same coating system in a rework situation so what are the alternatives?

Topics will include:

Material identification
Conformal Coating removal techniques
Cleaning & preparation
What coatings are compatible?
Re-coating assemblies after rework
Inspection of coatings after rework

Please click online conformal coating webinars for further information.

Nexus Conformal Coating Video Library: An operator de-masking or removing a masking boot from a header component

Nexus, the Conformal Coating Resource, have a section which has videos showing processes for conformal coating and also company video’s of which Nexus feels offer technical information to users of conformal coating.

This video shows an operator de-masking or removing a masking boot from a header component after the Conformal Coating application process

Click through to see the full range of Conformal Coating Videos at the Nexus Website.

Nexus Used Equipment: Reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards

SCH Technologies have a used WS101 Wet Stripping System for removal of conformal coating from printed circuit boards (PCBs).

Multiple tanks with or without pumping system. Hardly used so in fantastic condition.

Contact Nexus3C for further details.

Ref: 003Used

To find or advertise used click Second User Conformal Coating equipment,

Nexus Used Equipment: Reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards

SCH Technologies have a reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards for sale. The system has been used very little and can include pumps or stand alone.

Ref: 003Used.

To find or advertise used click Second User Conformal Coating equipment,