Conformal Coatings

Conformal coatings are thin, protective layers applied to PCBs and other electronic components. They provide insulation and shield electronics from environmental factors such as moisture, dust, and chemicals. Common coating types include acrylic, epoxy, silicone, and urethane. Most conformal coatings can be removed using standard solvents, while specialist solvents are available for precise removal or rework when needed.

Benefits of Conformal Coating Spray

Conformal coatings protect PCBs from external factors such as moisture, sea salt, chemicals, and extreme temperatures. This extends the lifespan of the circuit board and enables higher voltages and closer track spacing. These protective coating sprays are widely used in applications that demand high performance and reliability, including military, automotive, marine, and green energy sectors, as well as in domestic and mobile electronics.

How Board Coating Works

Conformal coatings form a thin, protective barrier over PCBs, providing protection against environmental threats. By preventing moisture and humidity from reaching the circuitry, the coating helps stop corrosion and electrical short circuits caused by electrochemical migration.

In addition to moisture protection, conformal coatings shield circuit boards from dust, dirt, and chemicals, while providing mechanical protection against vibration and thermal stress.

Types of PCB Coatings

PCB conformal coatings are available in a variety of formulations to meet different performance requirements.

• Acrylic Based: Acrylic conformal coatings are easy to apply and remove, offering fair elasticity and abrasion resistance. They provide high dielectric strength, making them suitable for general-purpose electronics.
• Silicone Based: Silicone conformal coatings for PCBs perform well across a wide temperature range and resist chemicals and sea salt. Their flexibility makes them ideal for applications with thermal cycling or vibration.
• Polyurethane Based: Polyurethane conformal coatings provide excellent moisture and chemical resistance. They are also highly abrasion-resistant, making them suitable for demanding industrial and outdoor applications.
• Epoxy Based: Epoxy coatings offer strong humidity resistance and high chemical and abrasion protection. They are ideal for electronics exposed to harsh environments, though they can be less flexible than other types.
• Parylene Based: Parylene conformal coatings form a uniform, pinhole-free layer that provides superior moisture, chemical, and dielectric protection. They are applied through a vapor deposition process, making them ideal for high-reliability and precision electronics.

Industrial Applications of Circuit Board Sealers

Conformal coatings play a crucial role in protecting PCBs and electronic assemblies in industries where exposure to moisture, chemicals, extreme temperatures, and vibration is common.

Automotive Industry

Conformal coatings protect automotive electronics from heat, vibration, and exposure to fluids like oil, fuel, and coolant. They are essential for engine control units, sensors, and lighting modules to maintain long-term performance.

Aerospace Production

In aerospace, conformal coatings safeguard avionics and control systems from temperature extremes, humidity, and vibration. This ensures critical flight electronics operate reliably in high-stress conditions.

Marine Technologies

Marine electronics face challenges from saltwater, humidity, and corrosion. Conformal coatings provide a protective barrier for navigation, communication, and control systems, enhancing durability in harsh marine environments.

Industrial Environments

Manufacturing and industrial electronics often encounter dust, chemicals, and mechanical stress. Circuit board sealers protect control systems, sensors, and monitoring devices, ensuring continuous operation and reduced downtime.

How to Apply A PCB Protective Coating

Conformal coatings can be applied using different methods depending on production volume, component density, and desired coverage. Common application methods include:

• Brushing: Ideal for low-volume or prototype boards; allows precise coating of individual components.
• Spraying: Suitable for low to medium volume production; can be done with aerosol cans or dedicated spray booths, providing even coverage across components.
• Dipping: Used in high-volume production; boards are submerged in the coating to ensure complete coverage.
• Masking: Critical for protecting areas that should not be coated, such as connectors, sockets, or test points.

How to Choose Circuit Board Coatings

Selecting the right conformal coating depends on the application, environmental conditions, and PCB requirements. Key considerations include:

• Environmental Resistance: Consider the level of protection needed against moisture, humidity, chemicals, temperature extremes, or salt exposure.
• Electrical Properties: Ensure the conformal coating has appropriate dielectric strength to prevent short circuits and maintain signal integrity.
• Flexibility & Thermal Stress: Choose coatings that can handle vibration, thermal cycling, or mechanical stress without cracking.
• Ease of Application & Rework: Some coatings are easier to apply, remove, or rework; important for prototypes or high-mix production.
• Curing Requirements: Different coatings may require room temperature curing, heat curing, or UV curing; consider your production capabilities.
• Industry Standards & Compliance: Ensure the coating meets relevant standards for your industry, such as automotive, aerospace, or marine requirements.

How to Order Conformal Coatings from RS Australia

Find the right conformal coatings for any PCB or electronic project at RS Australia. We offer a wide range of products from trusted brands that include CRC, Electrolube, and RS PRO. Explore our full online selection online to find the right conformal coatings, electronics enclosures, and electrostatic bags for protecting PCBs across automotive, aerospace, marine, industrial, and general electronics applications.

Ordering is simple. Just select the products you need, add them to your cart, and complete your purchase through our secure online checkout. Detailed information on shipping times, costs, and service coverage across Australia is available on our Delivery Information page.