Parylene Coating
High Voltage Potting & Coating (HVPC) is an expert in the field of Parylene coating. Parylene is the best conformal coating used to protect high-voltage products. HVPC has a fully qualified Parylene evaporation process to apply the coating according to the MIL standard.
Parylene coating process
The Parylene coating provides a moisture barrier and protects the product against external influences. Parylene, also known as paraxylene, is applied to the product by a vacuum evaporation process. The base material is sublimated in the vaporiser to a gaseous dimer. This dimer is cracked by pyrolysis into a gaseous monomer. The gaseous monomer then condenses on the product in the process chamber with a uniform layer thickness of a few micrometers.
The entire Parylene process involves more than just evaporation. The cleaning of the product is particularly important. This is necessary to free the product from all contamination and ions. An adhesion promoter that ensures better adhesion and masking of the keep-out areas is necessary. At the end of the Parylene process, the layer thickness is measured, the masking removed, and the product visually checked.
The advantages of Parylene coating over other coatings are:
· Uniform layer thickness (molecular)
· Pinhole and stress-free application
· Extremely high breakdown voltage
· Moisture barrier
· Medically applicable
· Transparent
This makes Parylene coating the best conformal coating in the high-tech industries.
A number of examples where Parylene coating is used are circuit boards and electronic units in aviation. The Parylene coating ensures that the product is protected against the environment. The application of Parylene is also ideal for clinical applications because a Parylene coating has a low coefficient of friction. Low coefficient of friction means less resistance, thus less heat/loss.
At HVPC, we offer Parylene coating as a stand-alone product but also as part of the overall production process. Ask for the possibilities.