Parylene coating is a technology that vaporizes powdery raw materials in a vacuum to form a polymer film layer, and is a coating technology that uses CVD (Chemical-Vapor Depositon).
In the Parylene coating process, the powdered dimer is evaporated by heat, and the evaporated dimer is converted to a monomer through a thermal decomposition unit, cooled before the monomer diffuses into the vacuum chamber, and the cooled monomer is polymerized in the vacuum chamber. A film-type coating film is formed on the object surface.
Since the polymerization reaction of the Parylene coating occurs at a very low pressure and a normal temperature of 30°C or less, it does not generate thermal stress on the surface of the object, and pinholes and pores do not occur because the coating film is formed by a gas-type treatment process.
Unlike the wet coating, the Parylene coating is capable of forming a uniform coating film regardless of the shape even in a product having a complicated shape such as a fine gap, a sharp point, an edge, and a fine hole. Therefore, it is possible to obtain a very useful protective film for products composed of organic and inorganic compounds and organic/inorganic composites.