COATINGSParylene coatings
The Parylene coating process is unique in coating technology. The deposition process of polymers takes place at the molecular level and offers a high degree of flexibility: The first step is the vaporisation of solid dimers. The dimer is heated to a temperature of 160°C and converted into a gas. The gas is then pyrolysed (thermochemical decomposition of organic compounds) to split the dimer into its monomeric form. The monomeric gas is deposited in the deposition chamber at room temperature as a transparent polymer film. The film thickness achieved can vary depending on the application and can be between 0.2 and 100 µm per pass.
The Parylene coating is deposited under vacuum by condensation from the gas phase as a non-porous and transparent polymer film on the substrate material. Virtually any vacuum-suitable substrate material such as metal, glass, paper, paints, plastics, ferrite and silicon, even objects such as plants, insects or archaeological artefacts can be coated with Parylene.
Properties
- Working temperature up to 350°C (up to 450°C temporary)
- Elongation at break up to 250
- Coefficient of friction: dynamic < 0.5 - static < 0.3
- Short-term dielectric strength up to 280 KV / cm
- Volume resistance up to 10 17 Ohm-cm
- Moisture permeability < 0.1 g-mm/m2 -day (10x better than PU and epoxies, 100x better than acrylates)
- Resistant to acids