Design Rules for circuits to be conformal coated by Selective Robot

Selectively coating a circuit board with a robot can be a simple process.

However, for too many designers, conformal coating is simply a part number, to be applied to circuit boards.

This failure to appreciate the subtleties of the selective robot application process can result in an un-coatable (at least as specified) assembly process.

Follow our conformal coating design rules and save time, money and pain!

Every company has its own horror stories and folk lore about the challenges faced when conformal coating an assembly to successfully meet the designer’s specification.

It is almost certain that the majority of these ‘nightmare’ scenarios could have been headed off during the design and or prototyping stages of development.

Coating close to connectors.jpeg
Trying to coat connectors right up to the base of the component is going to challenge even the best engineers. Apply some conformal coating Design Rules and avoid these problems!

The design rules for conformal coating are straightforward.

Follow them and you can save money and time in your application process.

However, if the rules are not followed, the resultant circuit board design can challenge even the most sophisticated conformal coating system and its operator to achieve the finish desired.

Find out more about Conformal Coating Design Rules for Selective Robot Systems.

Nexus May Newsletter available to download soon

This months newsletter from Nexus covers some interesting topics.

We have a new article on Molecular Vapour Deposition (MVD) – What is it? MVD could be the next Parylene material right now and research is going on to test it.

Find out more from our newsletter.

We also have launched a new chapter in our Ebook, Designing for Conformal coating covering both reliability and process design.

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What are the critical points to correctly design your conformal coated circuit board to meet the highest standards?

When designing for reliability with conformal coating then there are several important areas to consider for the product:

  • Reliability Requirements
  • Life Cycle
  • Environment
  • Materials and Parts selection
  • Electrical Effects

The purpose of the conformal coating is to protect the printed circuit board. This is to increase the circuit and product reliability.

corroded circuit board
The purpose of the coating is to protect the circuit. Understanding the key points will ensure that the coating does its job

To ensure the right level of reliability is achieved with the conformal coating then a complete understanding of the design requirements for the circuit board is critical.

This should be the starting point for most engineers when considering designing for reliability.

Click designing for reliability with conformal coating to find out more.

 

Take your conformal coating out of the dark and avoid shadowing effects

Shadowing is where correct conformal coating coverage is not achieved on a section of a board due to a component or part of the board blocking another area of the circuit board.

This can occur when coating is applied by spray method to a circuit board. This can easily occur with 3D components and tall components.

conformal coating shadowing effects
Shadow effects can occur around tall components

Click to find out more about the causes of shadowing in conformal coating and how to stop shadowing problems.

Design Rules for Conformal Coating that could save you money, time and heartache

Unfortunately, for too many designers, conformal coating is simply a part number to apply to printed circuit boards.

Unfortunately, for too many designers, conformal coating is simply a part number to apply to printed circuit boards.

For manufacturers embracing lean philosophies and applying conformal coatings, a failure to appreciate the subtleties of the application process can result in an un-coatable (at least as specified) assembly process.

 

selective coated PCB 500
Unfortunately, too many designers see conformal coating as a part number and do not understand the application process

Nexus have split the conformal coating Design Rules into 4 sections.

These are:

  • General Design
  • Selective Robot
  • Dipping
  • Batch Spraying

The design rules for conformal coating are generally straightforward.

Follow them and you can save money and time in your application process.

However, if the rules are not followed, the resultant circuit board design can challenge even the most sophisticated conformal coating system and its operator to achieve the finish desired.

 

To find our more click Conformal Coating Design Rules for a Successful Process