Today’s advanced electronics and components must perform reliably for the product’s life, despite increasingly harsh operating environments. These electronics will not survive without adequate protection, resulting in device failure. Conformal coatings can play a critical role in protecting and ensuring the dependability of electronics.
Conformal coatings conform to the surface they are applied to and can protect devices and components from damage due to extreme temperatures and pressures, moisture, chemical exposure, UV exposure, and more. Depending on the specific coating, they can provide electronics with a host of beneficial properties, including:
- Dielectric properties
- Chemical and moisture barrier properties
- Coating protection of all exposed surfaces
- Crevice and multi-layer penetration protection
- Thermal and cryogenic stability
- Ultraviolet stability
When comparing the variety of conformal coatings, understanding the level of protection required, design considerations, and long-term operating environment will help determine which coating is best for a given application. Acrylic, epoxy, polyurethane, silicone, Parylene, plasma enhanced, and multi-layer coatings – applied in thicknesses ranging from nanometers to mils – provide a wide range of unique properties and characteristics to meet the specific requirements of each electronics application.
- Acrylic coatings offer excellent moisture and humidity resistance can also prevent fungus growth.
- Epoxy coatings offer extreme hardness, providing exceptional coating strength, abrasion resistance, and excellent chemical and temperature resistance.
- Silicone coatings are incredibly versatile, with excellent adhesion and resistance to heat, moisture, and UV light.
- Polyurethane coatings offer resistance to chemicals, minimal moisture penetration, and are excellent dielectric barriers.
- Parylene coatings offer excellent resistance to moisture, chemicals, acids, bases, and solvents. They also provide high dielectric strengths and low dielectric constants, making the coatings ideal electrical insulators.
- Plasma coatings provide excellent dielectric properties and moisture barrier protection, making them an ideal barrier against corrosion caused by exposure to moisture, humidity, perspiration, chemicals, and other liquid or solid materials.
- Multi-layer coatings are stacked structures that alternate different layers of organic and inorganic thin films, resulting in a coating with enhanced properties that performs better than the individual coatings.
As technologies continue to evolve and become more complex, it is vital that designers and manufacturers find an effective solution to protect critical electronics. Conformal coatings are often relied on to protect electronics to mitigate premature failure and elongate product life to reduce electronic waste.
