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Improve your conformal coating masking process reliability with custom boots

One of the most underestimated reasons for using conformal coating masking boots is that they improve the reliability of the process.

This is because they don’t leak as easily as conformal coating masking tape can!

The reality is that a well-designed boot will not allow conformal coating to penetrate into a component if it’s placed correctly; and the fact is that this is a very easy thing to do.

An operator using masking tape has to continuously show care and attention when applying the tape to the components. The level of skill required is high.

The level of skill required to apply a masking boot is much lower.

So, fewer errors are made and there are less costly repairs due to leaks.

Therefore, not only do you save up to 60% of your conformal coating masking costs due to reduced process times with boots but you can also improve the reliability of the masking process.


Need to know more about conformal coating masking boots in your application process?

Contact us now and we can discuss how we can help you.

Call us on +44 (0) 1226 249019, email your requirements on sales@schservices.com, contact our distributors direct or complete the details in the contact form.

 

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Why use a conformal coating to protect your electronic circuit board assembly?

conformal-coating-markets-and-uses

A conformal coating protects the circuit board during its lifetime of use

A conformal coating is a protective non conductive dielectric layer that is applied onto the printed circuit board assembly surface to protect the electronic assembly during its working life.

The coating protects from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments.

The coating is usually used on electronic products that are exposed to adverse environments where heat, chemicals and / or moisture are prevalent.

Conformal coating also can prevent damage from rough handling, installation, reduction of mechanical and thermal stress.

It can prolong the life of the product during its operation and at the same time, it can help to increase the dielectric strength between conductors enabling the design of the PCB to be more compact and small.

Finally, it also acts to protect circuitry and components from abrasion and solvents.


Want to know more?

For help on conformal coatings then talk to SCH directly.

We can help with all coating requirements and offer free advice to help you.

Contact us now

Check out our website at http://www.conformalcoating.co.uk or call us on +44 (0) 1226 249019, email your requirements on sales@schservices.com, contact our distributors direct or complete the details in the contact form.

Bright Shield conformal coatings to be distributed through SCH Technologies in India

Bright Shield LogoSCH announces the distribution of Bright Shield Conformal Coatings from Trinity Shields for the Asian market at the Electronica Exhibition in Bangalore, India in September 2014.

This is part of SCH’s ongoing expansion in Asia which includes the new office opening in India this Autumn along with direct staff employed there to help provide the high level of service customers expect.

Dr Lee Hitchens explains

“Trinity has been producing high quality conformal coatings in North America for many years with users ranging from the military to consumer electronics companies.  SCH and Trinity both identified a gap in the conformal coating market specifically within India and other BRIC countries and decided to move forward together. Trinity’s products meet the needs of the India market perfectly and we feel we can recommend them as a premier product”

Jonathan Jett, CEO of Trinity further explains:

“The Asian Electronics market demands high quality conformal coatings at a competitive price.  By offering the Bright Shield Conformal coatings on the Asian market for the first time, we are bridging the gap between quality and price by offering Indian manufactures the best in conformal coating while reducing their cost.  With Bright shield coatings, high quality at a competitive price is possible.  Trinity also recognizes the difficulty in stocking in India and we have committed to have inventory available for users when they need it and not have to wait for incoming shipments.”

Trinity will be showcasing these products with their distributor SCH Technologies at Booth 3125 at Electronica in Bangalore. Customers can visit the stand and request a free sample of liquid or aerosol conformal coating which will confirm that Bright Shield Conformal coatings offer a high quality product and a competitive price.

How much will my potting project cost me?

The cost is tricky to calculate without trialling. It will be based upon two factors:

  1. Cost of the actual encapsulation material. This is based upon how much you will use and the volume of material you buy per batch as this sort of material is highly price sensitive to volume.
  2. Cost of labour. If its a simple job its easy and low cost. If its complex then it can be more expensive.

Ultimately, you need to trial.

If you have a sample you can test on and can then determine a fixed price based upon volumes you estimate.
If you would like to check out your potting costs then let us trial our materials with you.
Contact us here at +44 1226 249019 or email sales@schservices.com

I have been asked to apply a really thick layer of conformal coating to my printed circuit board. What are the problems with this approach?

Applying conformal coating really thick is not a good idea especially if you exceed the recommended thickness from the manufacture.

There are several reasons for this but the two key ones are:

  1. Applying a thick coating can cause long-term reliability issues. This is because the conformal coating can crack and craze in the long-term. It can also possibly cause damage to the PCB due to Coefficient of Thermal Expansion (CTE) mismatch between components and the coating.
  2. Defects like bubbles can occur when applying really thick conformal coating layers.

If in doubt, more is not better. Conformal coatings are not designed as encapsulates and potting compounds. The IPC and mil spec recommend certain thicknesses such as 30-150um for acrylics. It’s a good idea to keep within these tolerances and use conformal coating thickness measurement systems to check.

For further information on Coating Thickness application issues or other areas please contact us here at +44 1226 249019 or email sales@schservices.com


 

Need a Conformal Coating Expert on the team but don’t need them full time?

Want to have instant access to questions like this by talking with our team?

Then sign up for our great value Conformal Coating Support Contracts.

Contact us NOW at  +44 1226 249019 or email sales@schservices.com

 

Why do circuit boards fail due to poor conformal coating application?

Conformal coating defect on PCB leading to poor coverage

Conformal coating defect on PCB leading to poor coverage

When considering the long term reliability of Printed circuit boards (PCBs), it is important to understand that they can fail due to being exposed to harsh or extreme environments such as airborne contamination, salt spray, moisture, fungus, dust and corrosion.

By definition conformal coating is a protective non conductive dielectric layer that is applied onto the printed circuit board assembly to protect the electronic assembly from this damage. The coating when applied well gives added protection. So, if the conformal coating is poorly applied to the PCB then the circuit board is more likely to fail in the long-term.

Looking specifically at the application of the coating there are several defects that can occur during processing that can fundamentally impair the performance of the conformal coating. This can lead to reduced long-term reliability of the PCB. These defects can include Capillary Flow, De-wetting, De-lamination, Cracking, Orange Peel, Pin holes, Bubbles & Foam.

Logically, it is wise to avoid these effects in the process which can potentially improve the lifetime of the circuit board and limit problems in the field.

For further information click conformal coating defects and long-term reliability or contact us NOW at  +44 1226 249019 or email sales@schservices.com

My Customer has asked for two layers of conformal coating applied. Is this a problem?

The surface energy of the substrate is lower than the conformal coating

Getting the application of the conformal coating wrong is more critical than the number of coating layers applied

Generally, the critical factor in applying conformal coating is not the number of coats applied. Factors that can influence the performance of the coating are:

  1. The total coating thickness. Too thick and the coating may crack in the long term. Too thin and it will have a less effective performance
  2. The defects created when applying the coating layer. Again, thickness is the overriding influence and applying too thick a coating can cause issues such as bubble entrapment in the film

That said it is best to avoid creating laminating layers of coating with too much time between coating layers.

Contact us here at +44 1226 249019 or email sales@schservices.com

 


 

Need a Conformal Coating Expert on the team but don’t need them full time?

Want to have instant access to questions like this by talking with our team?

Then sign up for our great value Conformal Coating Support Contracts.

Contact us NOW at  +44 1226 249019 or email sales@schservices.com