The English name of Parylene is Parylene, a new type of protective polymer conformal coating material developed and applied by Union Carbide Co. in the United States in the mid-1960s. It is a polymer of p-xylene. According to the different molecular structures, Parylene can be divided into Parylene N type, Parylene C type, Parylene D type, Parylene F, HT type and other types. With its unique physical properties, electrical properties and biocompatibility, it is widely used in medical design and manufacturing, national defense and aerospace, biomedicine, MEMS and nanotechnology, cultural relics protection and other fields, providing more and more miniaturized products Excellent protection.

Parylene is a unique vacuum-deposited polymer that grows transparent, high-quality, pinhole-free, conformal coatings under vacuum at room temperature. These polymers also exhibit excellent chemical and corrosion resistance, high dielectric strength, very low moisture and gas permeability, high temperature and UV stability, and biocompatibility, making parylene an ideal choice for a variety of medical, Coating material of choice for aerospace, military and other industrial coating applications.

Parylene conformal coatings are some of the best protection options available for printed circuit boards, multi-layer assemblies and other electronics. The coatings are applied through a vapor phase deposition (VPD) process that transforms the solid Parylene raw material, known as dimer, into a gas, enabling complete coverage of the substrate’s surface including deep penetration into small crevices. The Parylene film layer is uniform, and the polymer can be applied to almost any substrate material.

In addition to their molecular-level deposition that results in highly-reliable, protective coatings, additional advantages of Parylene conformal coatings for electronics include:

• No curing process
• Nonconductive properties
• Ultra-thin layers, usually measured in microns
• Durable against environmental factors
• Resistant to moisture and chemicals
• Comprehensive, pinhole-free coverage
• Stable in temperatures up to 350°C long-term

The protective features of Parylene conformal coating are advantageous for many electronic systems, including:

• Wafers
• Circuit boards
• Power supplies
• I/O and PCI modules
• Backplanes
• Multi-layer assemblies
• Microelectromechanical Systems (MEMs)
• Sensors
• Power converters and supplies
• Batteries
• LEDs