What Is Type XY Conformal Coating?

Type XY conformal coating, also known as Parylene, derives its name from its full chemical name, para-xylylene. To streamline its classification with other conformal coatings like acrylics (AR), silicones (SR), epoxies (ER), and urethanes (UR), the shorter name “Parylene” was eventually adopted.

Type XY Conformal Coating Application

Type XY conformal coating is applied through a vapor deposition process. To ensure adhesion, parts are lightly rinsed to remove any contamination from air and/or handling. Next, parts to be coated are masked, if necessary, and loaded into the coating chamber. Then, the solid state raw material used to form Parylene, called dimer, is loaded into the machine. The raw dimer is heated between 100ºC to 150ºC. At this time, the vapor is pulled, under vacuum into the furnace and heated to very high temperatures, which allows for sublimation and the splitting of the molecule into a monomer. The monomer gas continues to be drawn by vacuum one molecule at a time onto the desired substrate at ambient temperatures in the coating chamber where it forms an ultra-thin polymer film (Parylene) on the substrates inside the vacuum chamber. Once the process is complete, parts are removed, demasked if necessary, and packaged for return shipment to the customer.

Trusted Coating Service Professionals

SCS offers reputable and reliable services for your Parylene coating needs. With over 50 years of experience in Parylene engineering and applications, SCS is the world leader in Parylene conformal coating technologies. Our extensive, proactive approach to production and quality requirements gives our customers peace of mind and minimizes the resources they need to meet even the most challenging requirements and specifications. Contact SCS to learn more.