PCB Conformal Coating

Leading the way for over 40 years

PCB Conformal Coating

At Mer-Mar Electronics, we are committed to cater to all your PCB requirements including PCB conformal coating services. With over 40 years of expertise in fabricating and assembling high quality PCBs, Mer-Mar Electronics is the go to name for a wide variety of clients. Not without reason! Not only do we have access to the latest machines and technology, our team of experts, has a wealth of experience and is equipped with industry best practices that go a long way in ensuring improved efficiency of products.

We are extremely committed to not just fabricating quality PCBs but also keeping them well-protected with our high-quality PCB conformal coating services. Simply put, PCB conformal coating is the process of applying a protective polymer film that safeguards the components of the PCB. It is extremely important as it protects the PCB against any environmental hazards. Some of the aspects against which conformal coating is extremely effective include:

  • Electrical leakage
  • Exposure to moisture and other corrosive threats
  • High Temperature
  • Mechanical Shock and Vibration
  • Dust

PCB Conformal coating is a specialized job since it is important to ensure that the coating is compatible with the components, as also appropriate for the environment. It also needs to be reliable and durable so that it extends product life, besides being cost-effective.

Besides making the right choice of material it is also important that the application of the coating is done correctly so that it offers optimal protection.

Our PCB conformal coating services are designed to meet the requirements of different environments to which the PCB will be exposed. Our clientele spans a number of industry verticals and client satisfaction is the biggest measure of our success.

Why you should bank on Mer-Mar Electronics for
your PCB conformal coating needs?

Rich Expertise – You can count on our rich experience and expertise to offer you the right selection of conformal coating that is optimal for the environment and is compatible with the components. Besides, the use of the right application process ensures that the efficacy of the coating is enhanced.

Wide Range of Conformal Coating – Depending on your bespoke requirements, we offer a wide range of coating to choose from. Importantly, our experts can guide you through the process so that you make the right choice that extends the product life and is cost-effective.

Suited for all volume requirements – Whether your requirement is for medium, low or high-volume coating, we have you covered. From prototype coating to coating for large production runs, we handle it all with stringent timelines.

Quick turnaround time – With early go-to-market being an important competitive advantage, we offer quick turnaround time for your conformal coating needs.

PCB Conformal Coating Services

PCB Conformal Coating

Testing and Inspection Services

Getting into the process of conformal coating before testing, is replete with risks. If it is not done correctly, you face the risk of removing the coating and then reapplying it. All of this means investment in terms of both time and money. In addition, if you have a go-to-market deadline staring at you, it can have further implications.

Prior to the application of the coating, therefore, we ensure that there is a thorough inspection of the assembly. Custom plasma processes are applied at this stage to ensure the surface cleanliness specifications are adhered to.

Plasma is essentially an energy-rich gas state that can modify the surface. Plasma treatment ensures the following:

  • It cleans the surface of the circuit board, the components and laminate so that it is contamination free
  • It activates the surface of the circuit board parts to ensure better adhesion and bonding
  • A surface modifying thin film coating is applied to the circuit board so that a barrier to moisture is created.
Conformal Coating PCB

Material Selection in Conformal Coating

With use of our engineering expertise, we make a choice of the right material from the various types of coating material available such as Acrylic Resin, Parylene, Polyurethane, Epoxy, Silicone and more. This is a crucial process as a wrong choice made here can result in the conformal coating and therefore, the PCB is being unable to withstand the harsh environment that they are subject to.

PCB Conformal Coating Service

Post Application Inspection

A thorough inspection post application, ensures the quality of conformal coating.

The IPC acceptance criteria for conformal coating within the coverage section includes that the coating be:

  • Completely cured and homogeneous.
  • Coating should be present only in those areas where coating is required.
  • No bridging of adjacent lands or conductive surfaces from:
    • Loss of adhesion.
    • Voids or bubbles.
    • De-wetting.
    • Cracks.
    • Ripples.
    • Fisheyes or orange peel.
  • Foreign material should not violate minimum electrical clearance between components, lands, or conductive surfaces.
  • Coating needs to be thin, but should effectively coat component/device edges.
Conformal Coating for PCB

Conformal Coating Rework

If you encounter a situation where a component needs to be replaced or where there is contamination of the assembly, conformal coating rework becomes a necessity. Equipped with the right tools and skilled manpower, we ensure that there is no damage when the old coating is stripped and the new one, applied.

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PCB Conformal Coating Capabilities

Types of PCB Conformal Coating

At Mer-Mar Electronics, we have on offer a wide range of PCB conformal coating material to meet your bespoke needs. These include:

Acrylic Resin

This coating is known for its:

  • Capacity to dissolve in many organic solvents
  • Offers great humidity resistance
  • Quick drying capabiities
  • Smooth finish
  • Conforming to Mil-I-46058C and IPC-CC-830 standard specifications.

Parylene

A polymer based compound, the importance of this coating lies in:

  • Its ability to penetrate narrow spaces
  • Thermal endurance properties
  • Adherence to USP Class VI Plastics requirements and NBC requirements in AR70 / AFR80-38 / Navinst 3400.2.

Polyurethane

The importance of this coating lies in:

  • Enhanced chemical resistance
  • Dielectric properties
  • It is Mil-I-46058C and IPC-CC-830 approved.
  • Strong adhesive properties
  • High resistance to humidity

Epoxy

This coating is known for its:

  • Chemical resistance
  • Resistance to humidity
  • Ability to form a rigid coating

Silicones

A soft, flexible coating, this is known for:

  • Corrosion resistance
  • Chemical resistance
  • Suited for high impedance circuitry
  • Thermal resistance
  • UV resistance
  • Humidity resistance
  • Light transmission properties
  • Conforming to MIL-I-46058C and IPC-CC-830 standards.

Besides ensuring that we use the right coating material and employ the right process, the checklist we run through to provide the best results include:

  • The coating is applied to a clean surface.
  • It is compatible with the components.
  • It works well for the environment.
  • It is reliable, cost-effective.
  • It is compliant to the industry standards.

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Conformal Coating Process

As much as the choice of the right coating is important in ensuring the PCB is aqequately protected, what is also important is the coating application process. The best conformal coating if applied poorly provides inadequate levels of protection. What is important to ensure are the following aspects:

  • The thickness of coating and its uniformity.
  • How well the coating bonds with the board.
  • The extent of coverage.

This is possible once the right conformal coating process is used. Our conformal coating process includes the following steps:

Cleaning

Cleaning of printed circuit board assemblies is imperative to ensure that the coating of choice bonds well with the substrate and that all contaminants that can impact adhesion as well as the look of the final coating, are removed. It is also ensured that any active solder residues are eradicated.

Masking

Reliable masking is required for a conformal coating to be truly effective. Poor masking can result in assembly operating failures on account of coating contamination.

Application

Post the surface cleanliness and masking, we ensure that the right conformal coating method is selected from among the following options:

Curing

Curing methods include air drying which is highly in vogue for acrylic coatings. Oftentimes heat can also be applied- usually between 80°C to 110°C- to ensure efficiency. UV coating material often only requires regular sunlight. However, some coatings could require addition of heat as well as a rise in humidity.

Inspection

Detailed inspection is the final and crucial process. Inspection is carried out under normal light and normal magnification, however depending on the kind of coating, it is also undertaken under increased magnification as also under UV.

Conformal coating removal

Replacement of a component or contamination of assembly can necessitate conforming coating removal. The right tools and skill and precision are needed to do this so that the assembly or its components are not damaged.

PCB Conformal Coating Services

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Application of PCB Conformal Coating

While conformal coating finds a wide range of application, given its ability to protect PCBs in harsh environments, its usage is particularly wide spread in the following industries:

  • Automotive
  • Military
  • Aerospace
  • Marine
  • Industrial and green energy applications
  • Mobile electronics industry
  • Medical
  • Telecommunication

FAQs