Uses and Benefits of Parylene Conformal Coating

Parylene is a unique and versatile polymer coating. Recently, it has gained some popularity thanks to the many benefits and uses it has. In fact, today, parylene conformal coatings, or PCT, can be used in virtually every industry across the globe.

The name parylene is a generic term used for a series of different polymers that are based on paraxylene. The parylenes are created by the pyrolysis of a specific dimer (di-p-xylene) in a vacuum. This vapor will then be deposited on the substrate, which remains at room temperature in the vacuum chamber. This vapor phase deposit ensures the product creates a continuous film that conforms to the substrate it is being deposited on.

Unlike traditional liquid coatings, the parylene will create a uniform coating on all sharp points as well as hard-to-get-to crevices and corners. Also, since the coating is entirely pinhole-free, it offers an unbeatable barrier of protection from the outside environment. In fact, these coatings provide a superior level of protection against gases, solvents, chemicals, and moisture. Keep reading to learn about some of the unique and popular uses for this coating.

Circuit Boards

Thanks to the characteristics mentioned above, parylene is now considered the top option for use on circuit boards and wire-wound devices like stators and electric motors. In addition to the specialized protection capabilities, parylene also offers electrical insulation properties, a low dielectric constant, and a low friction coefficient.


Today, LED Light Emitting Diodes are a popular form of light. They have replaced the more common and widely used filament bulbs found in streetlights, traffic signage, outdoor ads, car headlights, and more. LEDs are also considered more energy friendly and reliable, but they do have a few unique challenges that other bulbs do not face.

For example, LEDs are much more susceptible to ultraviolet light when exposed to the sun, heat, and moisture. These are additional situations where parylene is useful. That is because parylene will not distort the light, nor does it add weight to the bulb. While this is true, it still offers a maximum level of protection from UV light, moisture, and heat.

The Medical Industry

When it comes to parylene coatings, the medical industry has the most diverse and widespread uses. The thinner film of the parylene coating is non-toxic, biocompatible, and pinhole-free. As a result, it offers a barrier against inorganic and organic solvents and fluids. It will also effectively withstand all types of sterilization methods, which include autoclave, gamma, and E-beam. Some of the top examples of items that are protected and coated with parylene include catheters, hypo needles, medicine bottles, coronary stents, hearing aids, and implantable devices.

Automotive Industry

Several of the complex components found in vehicles and electronic systems require a coating of parylene. This ensures the parts can continue to operate properly and safely in a harsh environments, including being exposed to salt, oils, cold, and heat.

It is clear the uses for parylene are vast. It is a substance that is used in an array of industries and that offers many benefits.