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PCB Conformal Coating Services

Conformal coatings are protective layers or films applied to printed circuit boards (PCBs) to shield sensitive electronic components from harsh environmental conditions such as moisture, dust, chemicals, and temperature fluctuations. These coatings are essential in preventing corrosion, electrical leakage, and short circuits, ensuring long-lasting performance and reliability. At Accelerated Assemblies, we offer comprehensive PCB conformal coating services, designed to protect your PCBs from these environmental hazards, enhancing their durability and performance throughout their service life. Request a quote to know more about our service!

Premium coating materials we use for optimal PCB protection

At Accelerated Assemblies, we use a range of advanced coating materials that work as protective film barriers for your PCBs. Each one is selected to meet specific requirements and enhance the durability of your electronic assemblies.

  1. Parylene:  Parylene coatings are applied through a vapor deposition process. This forms a uniform, pinhole-free layer that conforms to intricate geometries. This is suitable in crucial sectors such as aerospace, medical devices, and military electronics. Parylene provides exceptional moisture and chemical resistance, along with high dielectric strength.
  2. Acrylic resin: Acrylic coatings are known for their ease of application and excellent dielectric properties. They offer robust protection against moisture, dust, and fungal growth. This works best for consumer electronics and general industrial applications. Acrylic coatings are also UV traceable, facilitating quality control inspections.
  3. Epoxy resin: Epoxy coatings are useful for structural stability and excellent abrasion resistance. They offer robust protection against mechanical wear and chemical exposure, making them ideal for heavy-duty industrial applications. However, their rigidity can make rework challenging.
  4. Silicone: Silicone coatings are valued for their flexibility and high thermal stability, performing reliably in temperatures ranging from -45°C to 150°C. They offer excellent moisture resistance and are ideal for applications subjected to vibration and thermal cycling, such as automotive and outdoor electronics.
  5. Polyurethane (Urethane): Polyurethane coatings offer superior chemical and moisture resistance, along with high mechanical strength. They are particularly effective in environments exposed to aggressive chemicals, humidity, and temperature variations, making them suitable for automotive, industrial, and military applications.

Our PCB Conformal Coating Services

At Accelerated Assemblies, we offer a full spectrum of PCB conformal coating services to safeguard your printed circuit boards against environmental hazards.

  1. Material selection and application: We provide expert guidance in selecting the appropriate coating material tailored to your specific environmental and operational requirements. Our team ensures precise application to achieve optimal protection.
  2. Surface inspection: Prior to coating, we perform thorough cleaning and surface activation processes, such as plasma treatment. This is to ensure excellent adhesion and remove contaminants that could affect coating performance.
  3. Coating application method: Based on your requirement, we employ various application techniques, including:
  • Spray Coating: Ideal for large-scale production, providing uniform coverage.
  • Dip Coating: Suitable for complex geometries, ensuring complete encapsulation.
  • Brush Coating: Used for touchups or small batches requiring detailed attention.
  1. Curing and drying: We use appropriate curing methods such as heat, UV light, or air drying to ensure the coating achieves its full protective properties.
     5. Post application inspection: Our comprehensive inspection process includes:
  • Visual inspection: We detect any visible defects or inconsistencies.
  • Thickness measurement: We ensure uniform coating thickness across the PCB.
  • Adhesion testing: We verify the bond strength between the coating and the PCB surface.
  • Electrical testing: We confirm that the coating does not interfere with the PCB's functionality.
  1. Rework and repair services: In case of component replacement or contamination, we offer conformal coating rework services. Our skilled technicians carefully remove the old coating and apply a new layer without damaging the PCB or components.

Key Benefits of PCB Conformal Coating Services

Here’s how our PCB conformal coating services can benefit your products.

  1. Improved durability and longevity: Conformal coatings act as protective film barriers for PCBs, safeguarding your circuit boards from environmental factors such as moisture, dust, and chemicals. This leads to an increased lifespan of your electronics.
  2. Improved performance: By preventing leakage and corrosion of the solder joints and conductive traces, conformal coatings improve electrical performance and reduce signal degradation.
  3. Vibration and shock protection: Conformal coatings add an extra layer of mechanical protection, making your PCBs more resilient to vibrations and shocks.
  4. Enhanced thermal stability: Conformal coatings provide thermal protection, which is especially important for applications exposed to high or fluctuating temperatures.
  5. Corrosion prevention: Corrosion is a common issue for PCBs exposed to moisture or harsh chemicals. Conformal coatings act as a barrier, preventing the effects of corrosion on metal parts of the PCB.

Applications of PCB Conformal Coatings

Protecting printed circuit boards through advanced PCB conformal coating services is essential across a wide range of industries. Here are a few ones:

  1. Automotive: In the automotive industry, chemical-resistant PCB coatings and moisture-resistant PCB coatings play a crucial role in ensuring that electronics remain reliable under extreme conditions.
  2. Lighting: In lighting applications, protective film barriers for PCBs are essential to extend the life of LEDs and other lighting components by shielding them from UV light, moisture, and temperature extremes for long-lasting and reliable lighting solutions.
  3. Military and defense: In the military and defense sectors, where electronic reliability is paramount, PCB conformal coating services are used to protect circuit boards in harsh environments.
  4. Electronics: For consumer electronics PCBs, parylene conformal coating offers a superior defense against moisture, dust, and other contaminants.
  5. Telecommunication: Telecommunication devices rely on moisture-resistant PCB coatings to maintain signal integrity and functionality in challenging environments. Our coatings ensure the longevity of essential communication systems.
Ensure your electronic products stand the test of time with our expert PCB conformal coating services. Whether it's enhancing reliability, preventing corrosion, or providing thermal stability, we have the right coating solution for your needs.
 
Contact us today to discuss your project and discover how our advanced coatings can safeguard your PCBs and ensure superior performance and longevity! 

Frequently Asked Questions (FAQs)

  • Do conformal coatings need to be physically strong or hard?
    Conformal coatings are designed mainly for environmental protection rather than physical durability. Their main purpose is to safeguard electronic circuits from extreme temperatures, humidity, water, and common chemicals, without requiring high mechanical strength. In fact, coatings with excessive hardness or strength may introduce unwanted stresses at the interface between the coating and the circuit board. These stresses can cause critical issues such as component malfunction or even coating delamination, which compromises the protection they offer. The ideal conformal coating balances flexibility with environmental resistance, ensuring long-term reliability without negatively impacting the performance of your electronics.
     
  • How to effectively mask areas for conformal coating?
    Masking areas before applying conformal coatings is crucial to ensure that critical components remain protected. Here are the best practices. 
    • Masking Tape: Use specialized masking tapes, often in dot and stripe shapes. These are ideal for flat surfaces. Prefer tapes made from polyester or polyimide with pressure-sensitive adhesives, and ensure they are fully anti-static.
    • Rubber Boots for Connectors: Use rubber boots to cover connectors and pins. These boots must be custom-designed for each connector to ensure a perfect fit.
    • Advanced Masking Tapes: These tapes conform to small curvatures, making them highly effective for a wide range of applications.
    • Liquid Masking Gel: For added flexibility, use a liquid masking gel that can be applied directly to pins and connectors. The gel self-forms into a boot, providing a cost-effective alternative to custom molding. It can be easily peeled off after use and even reused.

  • Should I apply conformal coatings on the edges of my circuit board?
    Yes, absolutely. While it's common for circuit board edges to be left unprotected, applying conformal coating to these areas is highly recommended. The edges of circuit boards, often exposed after cutting, are vulnerable to moisture and contaminants, which can easily infiltrate between the solder mask and the board itself. This can lead to corrosion, reduced performance, and premature failure.
     
    By applying a conformal coating to the edges, you effectively block this moisture migration, ensuring that your circuit board stays protected.
     
  • What is dielectric strength, and why is it important in conformal coating?
    Dielectric strength measures a material's ability to resist electrical breakdown under high voltage. In conformal coatings, a higher dielectric strength ensures better insulation, protecting circuit boards from electrical failure. While circuit boards are designed for insulation during normal operation, the coating must not degrade this property.
     
    Key factors for effective conformal coatings include hydrophobicity (water resistance) and low ionic contamination. Coatings with these characteristics prevent moisture and ionic impurities from compromising the dielectric strength, ensuring safe, reliable operation.
     

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BLOGS

Understanding Conformal Coatings and Their Types
 Oct 27, 2015
 acceleratedassemblies
 PCB Conformal Coatings
Conformal Coatings

Circuitry protection is an important aspect] when manufacturing Printed Circuit Boards (PCBs). One of the primary methods of protection is applying conformal coatings.

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4 Main Types of Conformal Coating Application Methods
 Oct 13, 2015
 acceleratedassemblies
 Conformal Coating,PCB Coating,PCB conformal coating service
Conformal Coating Application

Once a PCB is manufactured with all components and connections in place, it is coated with a layer. This layer, known as conformal coating is applied to protect the intricate traces and components from damage. Conformal coating also keeps the traces from merging over time, reducing chances of cross ...

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Understanding the Importance of Silicone Conformal Coating
 Jun 01, 2015
 acceleratedassemblies
 PCB Conformal Coatings,PCB conformal coating service
Silicone Conformal Coating

Several types of materials are used for conformal coating of Printed Circuit Boards (PCBs). Silicone conformal coating is the popular choice with most users.

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