Why Use Parylene?
Parylene offers unique benefits not commonly found in other barrier coatings.
Parylene has many benefits that can be customized to your specific application. We’ve selected the most common benefits below. If you do not see a benefit you are looking for listed below, please contact us to find out more.
Often a first consideration in selecting high value coatings for medical industries, parylene is an FDA approved material that meets USP Class VI and ISO 10993 biocompatibility requirements for use on human implantable devices. Standing the test of time, the use of parylene is well-documented in an increasingly wide range of medical coating applications over the past 40 years.
Parylene provides superior protection from moisture, corrosion, salt spray, solvents, airborne contaminants and many hostile environments. It is chemically inert, ultra-thin, pinhole-free and conforms to components evenly and consistently. Due to parylene’s unique molecular-level deposition, this high level of protection is achieved with 10% of the mass than spray or dip coatings.
Parylene enables the design of smaller, more compact electronics by providing protection from internal and external electrical interference due to its combination of high dielectric strength, low dielectric constant and very low dissipation factor properties. It is often used in implantable medical devices as parylene forms an electrical barrier between the device’s electronics and electrical signals produced in the body.
When applied as a sub-micron layer, parylene provides a lubricious surface that bonds completely to a variety of device substrates. Improving lubricity, without the risk of shedding particles, reduces the resistance force of of pushing catheters, guidewires or stents through restricted anatomy. The molecular deposition process produces a smooth, homogenous coating topography that remains flexible.
Parylene’s inert and biocompatible properties enable it to be an important bonding layer for drug-eluting medical technologies. Parylene acts as a release control agent when it applied between the metal or polymer substrate and pharmaceuticals. Additionally, the vapor deposition process allows complex shapes to be consistently coated with a high level of control.
Parylene’s completely-conformal properties are used to physically reinforce and add strength and rigidity to delicate connections on printed circuit boards (PCBs). Think of this as parylene welding. The combination of parylene’s crevice-penetrating ability along with its consistent coating thickness provide a protective “jacket” that greatly reduces failures caused by solder fatigue from thermal cycling and vibration, without board redesign.
Liquid Conformal Coating
Liquid conformal coatings are not truly conformal, and tend to collect and pool in low crevices while pulling away from raised edges and sharp points. Bubbling, cracking, pinholes and orange peel are typical in liquid coatings.
Parylene Conformal Coating
The major benefit of parylene’s gaseous deposition process is its unique ability to penetrate and grow a thin, uniform coating molecule-by-molecule on surfaces that are simply unreachable by liquid coatings.