The concept of Parylene coating

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.

Parylene coating properties

1. 1
   Excellent gas barrier (to H2O, O2, etc)
2. 2
   Excellent corrosion resistance
3. 3
   Strong resistance to most chemicals (acids, alkalis and solvents)
4. 4
   High insulation, low dielectric constant and low dielectric constant
5. 5
   Excellent flexibility and mechanical properties at very low temperatures
6. 6
   Excellent radiation resistance in an oxygen-free environment
7. 7
   Almost no out-gassing
8. 8
   Standards such as Mil-I-46058C, IPC-CC-830B, UL94 V-0, FDA Drug and Device Master Files, USP Class VI biocompatibility, and ISO 10993 for medical devices