conformal coatings

Ten reasons to use Molecular Vapor Deposition (MVD) in protecting electronic circuit boards

Molecular Vapor Deposition (MVD) is a new coating from Thin Film Partners that uses a hybrid coating process of alternating layers of ALD (Atomic Layer Deposition)  and CVD (Chemical Vapor Deposition) films combined with a hydrophobic final top coat.

The MVD method uses multiple alternate layers of these ultra-thin coatings with differing properties to build a completely protective coating.

Do you need UL qualification for your conformal coating?

In conformal coating, there are many International, National and internal company standards for manufacture of coating materials, processing and inspection.

The UL standards (and qualification) are used to qualify a conformal coating material to a certain specification. Therefore, it is a material manufacture standard only.

The question of whether a conformal coating actually needs the UL qualification to the standard is down to whether the test regime is relevant to the user of the conformal coating.

Why may I have to clean my circuit board before conformal coating?

Whether to clean circuit boards before conformal coating is a well discussed problem.

However, I thought it may be interesting to summarize the reasons for considering the cleaning process before coating as it can be critical to the success of the product in the field.

First, consider that cleaning of a printed circuit board (PCB) before applying conformal coating is normally done for two key reasons:

These are:

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.

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