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How do I brush coat my conformal coating?

The application of conformal coating using a brush to apply the material to the circuit board is a common practice.

This can be done as a complete production process or as a finishing task before final inspection.

The technique involves the conformal coating being applied selectively by the operator according to the requirements of the circuit board.

Areas not to be coated are avoided by the technician.

Why use conformal coatings?

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There are several reasons for using a conformal coating or Parylene to protect a printed circuit board (PCB).

These reasons include:

What application methods are available for applying conformal coating?

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Conformal coatings can be applied to printed circuit board assemblies in many different ways in the production environment.

Listed below are the common methods of applying the conformal coating materials.

How do I spray coat my conformal coating?

For correctly spraying a conformal coating on to a printed circuit board there are two key factors to consider.

They are:

  1. What equipment do you need to apply the conformal coating?
  2. What technique do you use to spray the conformal coating?

Read further to find out more.


What equipment do you need to apply the conformal coating?

For conformal coating spraying a typical set up are:

How do I measure conformal coating thickness?

Measuring the conformal coating thickness on a printed circuit boards assembly (PCBA) is not a simple process.

The fact of the matter is the circuit board is generally not flat for the majority of the surface.

Therefore, the uneven nature of the board can make it extremely difficult to actually measure any realistic results.

That said, there are several practical techniques for measuring the film thickness on a board, that include both dry or wet film coating.

These techniques include:

What is the science behind Molecular Vapour Deposition (MVD)?

TFP is now offering a new coating process, Molecular Vapour Deposition (MVD), that may be able to meet all of the environmental demands for circuit board protection and other surfaces.

The process could also be highly cost-effective.

This process is brand new to the electronics coating market and many other industrial sectors and could be a viable solution for many products.

What standards should I use for my conformal coating?

There are many international, national and internal company standards for conformal coating processing and inspection.

The role of the standard is to give a guideline for process control and ultimately reliability of the circuit board.

The International inspection standards for conformal coatings used by the majority of companies are the IPC A 610 Acceptability of Electronic Assemblies or the IPC –HDBK-830 Conformal Coating Handbook.

The first gives some minor references that help for specifying acceptance criteria.

What sectors are fluoropolymer coatings used?

Fluorinated coatings are a relatively new technology. They are also continuously evolving.

They are used in nearly all areas of industry including:

  • Aviation
  • Aerospace
  • Defence
  • Automotive
  • Industrial
  • Oil & Gas
  • Electronics
  • Medical / Pharmaceutical
  • Optics
  • Telecommunications
  • White goods / Commercial

This list is limited and there are a lot more areas that they are used.

How do I dip coat my printed circuit board in conformal coating?

A conformal coating can be applied in many ways to a printed circuit board assembly (PCBA). The many methods include spraying, brushing and dipping.

Dip coating is one of the most efficient methods for application of conformal coatings and is excellent for all volume production whether large or small. 

However, the dip technique really excels in high volume production since multiple circuit boards can be coated simultaneously.

Why is cleaning "no clean" flux residues difficult and how to get it right?

No clean flux residues on printed circuit boards are not designed to be cleaned easily. Fact.

Therefore, cleaning the residues left behind by a no clean flux process is one of the most difficult tasks when considering cleaning.

How do you “clean” no clean flux residues if you have to?

Whether a flux residue can be cleaned effectively depends on the cleaning materials saponification factor and its compatibility with the residues.

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