What is Parylene Coating?

Parylene is a unique conformal polymer coating that is applied at ambient temperatures inside specialized vacuum deposition equipment. This unique molecular deposition process, along with parylene’s material characteristics, yields highly desirable surface treatments not readily found in other conformal coatings.

What makes parylene special:

  • Ultra-thin coating, starting at 0.5 microns thick
  • Truly conformal barrier layer with exceptional moisture and chemical protection
  • Superior dielectric strength
  • Dry lubricity comparable to PTFE
  • Biocompatable and FDA approved for implantable devices
  • Adhesion tie layer for drug coatings and hydrophilic coatings

What is Parylene Coating Used For?

Waterproof barriers are essential to ensure critical electronics perform in a wide range of environments. Parylene offers excellent protection from airborne contaminants, corrosion, chemicals, gases and moisture. It accomplishes this level of protection with 10% the mass of spray or dip coatings.

Parylene possesses superior dielectric strength, a low dissipation factor, and high surface and volume resistivity that remain virtually constant with changes in temperature. As a result, parylene is often used in space-limited designs to eliminate issues such as arcing and corona discharge.

When applied between metal or polymer substrates and a top coating, parylene behaves as an adhesion layer. Parylene’s biostability and chemical inertness make it a unique solution for bonding drug and hydrophilic coatings to drug-eluting devices or catheters.

Dry film lubricity is an important consideration in the design, installation and function of disposable medical appliances like cardiac-assist devices (CADs), catheters, guidewires, and stents. Parylene’s low coefficient of friction reduces insertion-force up to 90% when compared to uncoated devices, significantly reducing the potential of puncture damage or severe abrasion generated between the device surface and the vessel walls.

Up Next: Process

Discover how parylene’s unique vapor deposition process works to produce the highest level of conformal protection available.

Deposition Process