Benefits of Conformal Coatings for LEDs

LEDs are often subjected to harsh environments. To ensure that they perform reliably long term in these conditions, LEDs often rely on conformal coatings. Below are the three coatings commonly considered to protect LEDs:

• Parylenes: Parylenes are often selected due to their ultra-thin, optically clear nature and resistance to moisture and chemicals. Designed for harsh environments, Parylene HT® provides excellent UV stability with thermal stability up to 350°C long-term.  
• Acrylic Resins: Acrylics, which can be formulated to be clear, provide protection against moisture.
• Silicones: Silicones are stable in high-temperature environments (exceeding 200°C). Due to the coatings’ thickness, they also provide moisture resistance.

Of these three coatings, Parylene is often the material of choice for LEDs facing tough operational and environmental conditions in outdoor applications. Parylene conformal coatings often provide the best defense against moisture, chemicals, corrosion, temperature changes and ultraviolet (UV) light – all in a single coating.

Additional advantages of Parylene coatings for LED applications include:

• Uniform thickness across topography
• Dielectric properties for protection against electrical currents
• Resistance to temperature extremes
• Lightweight; minimal mass added to the final product
• Electrical insulation properties
• Pinhole-free protection
• Optically clear to promote LED brightness

SCS Parylene coatings have provided unmatched protection to a wide range of LED applications, including:

• Electronic billboards
• Scoreboards
• Traffic signals
• Transportation signage
• Aviation lighting
• Vehicle lighting
• Marine lighting
• Outdoor illumination
• Commercial refrigeration
• Video displays

Contact SCS today for more information on conformal coatings for LED applications.