Why is it harder to mask and de-mask Parylene on a circuit board assembly compared to traditional liquid conformal coatings?

There are four key reasons why Parylene masking and de-masking is more difficult compared to liquid conformal coatings.

These are:

  1. Parylene is a vapour. When you are masking against a gas rather than a liquid then there is more of a challenge. So you need to provide a much better barrier with the masking process compared to the liquid coatings.
  2. Parylene is immersion. Most liquid conformal coatings are sprayed and so the capillary is less compared to immersion in a limitless supply of material.
  3. Stripping Parylene is hard. It is much harder to remove unwanted Parylene material on components that should not have been coated. Parylene is chemically inert (therefore harder to strip off or remove) and more difficult to see (no UV trace in most Parylene coatings). Mistakes can be more costly.
  4. The Parylene can bond more to the masking materials. When the Parylene is deposited on the masking materials and circuit board it can bind the two together and it can take significant effort and care to remove the masking materials without damaging the board or the Parylene coating integrity.

Need to find out more?

Click Parylene coating to protect electronic circuit boards to find out further information or contact us directly and we can help you.

If you are new to Nexus and our work on conformal coatings then a good place to go is our Start Here page or our free conformal coating eBook.

What are conformal coating masking boots?

Nexus Image 1Masking boots are formed shapes used to cover components before conformal coating.

They are made to replace tape and dots in the conformal coating masking process for both Parylene and liquid conformal coating processes.

Using masking boots in protecting printed circuit boards (PCBs) from conformal coating application errors can be a lower cost, more reliable solution to using tapes.

The use of masking tapes, dots and liquid latex can be an effective process in protecting components from ingress of conformal coating.

However, the masking can be labour intensive, difficult and time consuming.

Masking boots can offer a labour saving alternative in both the masking and de-masking stages of the coating process. This saves time and money.

Further if the boots are recyclable then the savings can be even higher.

Three reasons to use masking boots

  1. Masking time is normally reduced. Masking boots can be 4-5 times quicker than masking tape.
  2. De-masking time is reduced. Again it is normally much quicker to remove masking boots.
  3. Masking boots are much less likely to leak. So there is potentially less damage and rework of the circuit.

This means you could save a lot of money very quickly when switching to masking boots.

Nexus Image 2
Masking boots can offer a labour saving alternative in both the masking and de-masking stages of the coating process. This saves time and money.

 Need to find out more?

Click conformal coating masking for further information or contact us directly and we can help you.

If you are new to Nexus and our work on conformal coatings then a good place to go is our Start Here page or our free conformal coating eBook.

Elder masking tapes give a clear advantage in conformal coating

Elder conformal coating masking tapes and dotsThe need to see the area being masked to ensure complete coverage and adhesion is paramount in ensuring that your conformal coating is masked correctly and does not creep under the masking tape. ET501G is not only the only commercially available ‘Silicone Free’ tape but is translucent allowing a clear view of what is masked and its full adhesion.

Elder supply ET501G as slit rolls or Dots and are able to convert to your required size’s in order to suit your every masking requirement.

Find out more about Elder and conformal coating masking materials here.

Nexus July Newsletter almost ready to be sent out

Next week Nexus are launching two really interesting articles as part of the Nexus newsletter.

The first is a guest article from Warren Boomer of Thin Film Partners on why Parylene coating can cost more than traditional liquid conformal coatings can and how the price is calculated.

The second is  a review of where to start when selecting a conformal coating application process by Dr Lee Hitchens of Nexus.

Both can be read in the July newsletter being launched next week.

Make sure you are signed up now to receive this monthly technical email.


Did you read the June Edition of the Nexus Newsletter?

We had two great articles on the Critical areas of designing for conformal coating and Why selecting a conformal coating can cost you a fortune!

We also launched our new Practical conformal coating masking section.

Want to read the June Newsletter?

Just click  Newsletter now and find out more.

 

 

Practical conformal coating masking videos from Nexus

Nexus have collated a range of masking videos covering different materials including masking tapes, dots, liquid latex and masking boots.

Techniques for masking circuit boards with components, connectors, test points, mounting holes and via’s have been developed by many different companies with years of experience.

This knowledge has been put together to help others new to the art of conformal coating masking.

Categories for masking include tape, dots, latex and masking boots.

To view the videos click Practical conformal coating masking videos now.

TE Connectivity launch new range of ESD Conformal Coating Masking Boots

Completely masked PCB ready for conformal coatingTE Connectivity, a leading conformal coating masking boot manufacturer, can now boast that they provide the most complete range of standard and custom masking boots with the introduction of their new ESD range.

The ESD Safe Custom boots are constructed of static-safe masking materials and provide more options for engineers when selecting the right product for production.

This has given TE the ultimate range in masking boots and allows them to offer the best solutions to customers when considering conformal coating masking.

Click Here to read more….

For other Spotlighted conformal coating articles Click Here….

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.