Articles

NEW! SCH exhibit their custom conformal coating masking boots at SMT Nuremberg Show in Germany in May

masking boots

The use of other materials such as 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.

Recyclable masking boots offer a labour saving alternative in both the masking and de-masking stages of the coating process.

This saves you time and money.

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NEW! SCH launch a Parylene lab coating system at SMT Show

Parylene lab coating system 6 240SCH Technologies, the conformal coating solutions provider, are exhibiting a range of Parylene systems at the SMT Show in Nuremberg in May.

This range, complete with large-scale production systems, includes a new cost effective small-scale Parylene lab coating system designed for trials and low volume manufacture.

Designed with experience from processing with Parylene the new design has several key features that make it stand out as a top class product.

  • Sensibly sized chamber with a usable space of 8.75” dia. x 11.188” H (22.2 cm diameter, 28.4 cm H) internally
  • Electro-polished stainless steel chamber with a micro-soap used to prevent adhesion of Parylene to the chamber surfaces
  • Top specification parts such as quartz pyrolysis tube, chiller, vacuum pump and baffles to ensure high quality processing
  • Options such as swappable chambers and Vapour Phase Silane (VPS) adhesion promotion systems where required.

What is also critical is that the Parylene machine is offered at a highly competitive price for a top quality system.

This allows SCH to be world leading in offering this system in Europe and Asia.

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Improve your conformal coating masking process reliability with custom boots

Author: Dr. Lee Hitchens

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.

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How thick should I apply my conformal coating?

Author: Dr. Lee Hitchens

So, here is a question I am regularly asked. How thick should the conformal coating be on the circuit board?

Well, the simple answer is thick enough so the conformal coating works and protects the circuit board.

But not too thick as this can cause problems for the circuit board in the long term.

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A superior coating solution for LEDs using a novel new process

Author: Dr Lee Hitchens

Why protecting LEDs with a coating is a challenge

Conformal coatings are regularly used in the LED sector to protect the electronics from the environmentProtecting LEDs with a protective coating is big business.  The volume of manufactured LEDs globally is growing at an exponential rate and there is no end in sight.

However, the challenges to protect the LEDs themselves with the right coating are not insignificant especially in an outdoor environment.

Although there are many issues in protecting LEDS there are two key problems that really must be considered when selecting a coating.

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A novel new Parylene removal technique for completely stripping a circuit board

Parylene coating removal from a circuit board is not easy.  In fact it is a hard process to do well!

Now, there is a new process for completely removing the Parylene coating from the complete surface of a circuit when the coating is <15um.

Further, the process is relatively quick. Typically, the circuit can be completely removed of Parylene in under an hour.

Also, the process is safe. It does almost no harm to the circuit and is one of the safest methods for complete removal of Parylene.

Find out more about completely removing Parylene from the surface of a circuit board now.  

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Why cleaning “no clean” flux residues from a circuit board assembly can be difficult and how to get it right

Author: Dr Lee Hitchens

So why is no clean flux so difficult to clean?

Cleaning no clean flux residues is one of the most complex processes when considering cleaning.

No clean fluxes are by definition harder to clean than conventional rosin or modified resin based residues.  After all, the flux residues left on a printed circuit board assembly are supposed to be permanent. It was designed to be a no clean process.

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Why is adhesion important for conformal coatings?

Plasma treatment of surfaces to improve conformal coating adhesion

The durability and performance of conformal coatings can depend on two basic properties. These are the cohesion and the adhesion of the coating.

Cohesion is the inner strength of a material and is associated with the strength of the molecular forces within the bulk material. Adhesion is the strength of the bonds forming between the conformal coating and another surface.

Cohesive failure is usually in the coating film itself although it also could be within the substrate.

Adhesive failure can be a blister forming at the interface, lifting (delamination) of the conformal coating, or any other situation that results from low adhesion at the interface.

Both cohesion and adhesion are required for a long-lasting, protective conformal coating. Failures related to adhesion will determine the life of the coating on the product.

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How can plasma treatment help my conformal coating process?

atmospheric plamsa treatment of surfaces for improved conformal coating adhesion
Cleaning and coating circuit boards for long-term protection has taken place for many years.

The reasons for doing this have always remained the same:

  • Improve the surface cleanliness of the circuit to protect against corrosion and the effects of contamination on the surface from the process.
  • Add the conformal coating to protect the surface cleanliness and ensure it continues in the long term.
  • Change the characteristics of the surface of the circuit board.
  • Improve the surface energy of the surface to improve the adhesion of conformal coating.

Traditionally, cleaning and adhesion promotion has been achieved by either using a wet chemistry treatment like washing or applying extra undercoats (priming).

Now, there are new methods and techniques appearing on the market for improving cleaning, adhesion and actually coating circuit boards differently to the traditional methods.

One of these techniques is plasma treatment.

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