GENERAL APPEARANCE : Parylene is the generic name for a family of polymers with more than 20 variations. Only five of these are widely used. Thanks to its excellent mechanical, electrical and physicochemical properties, Parylene is used in a wide range of cutting-edge sectors. In contrast to other protective coatings which are painted, immersed or pulverised on a substrate, Parylene is applied using a process of evaporation in a vacuum chamber. During this process, a precursor called a “dimer” which comes in powder form, is heated at around 150°C. The dimer thus goes from a solid state to a gas ( sublimation ). The following step involves splitting the dimer into two active monomers. This separation occurs at 650°C in a tubular oven. Upon arrival in this chamber, the gaseous monomer spontaneously polymerises when it comes into contact with the substrate. Finally, gases that have not reacted are caught in a liquid nitrogen trap between -90 °C and -120 °C. The process uses neither a catalyser nor toxic additives and has a conversion rate of nearly 100 %.
Parylene is a highly technical coating that is ultra-thin and transparent, physically and chemically neutral, inert, biocompatible, insulating and protective, of a thickness that can be sized both easily and precisely ( from 50 nm to 100 microns ). It is totally uniform, pinhole-free and can be applied to small technical components. One of its most remarkable advantages is its form-fitting and penetrating nature.
The combination of these qualities make it an extremely interesting player in the most demanding technological fields, including electronics, micro-electronics, space and aeronautics, medical technologies, pharmacology (elastomers, silicone and plastics), sensors and mems, nanotechnologies, micromechanics, magnets and ferrites.