The coating is applied on circuit boards through a vacuum chamber where the components are coated in batches. Parylene is a material applied during the deposition process at room temperature.
All parts that shouldn’t be coated ought to be masked prior to the vapour deposition.
- It requires a specialist system that is designed for vacuum application.
- The set up may cost significant investment initially
- The process can handle low and medium volumes
- Vapour deposition application is relatively simple but the initial process development can be complex
- Coating thickness is an important parameter and calculations should be exact.
- It is one of the most expensive coating processes but produces the best finish.
Variables to consider in vapour deposition conformal coating:
- The operator’s skill and extensive training
- Knowledge in preparation particularly in handling Parylene material
- Cleanliness of the surface
- Masking requirements
- Circuit board design
Just like other conformal coating application process, there are advantages and disadvantages to using vapour deposition.
Some of the benefits include excellent protection due to very low permeability, high solvent and salt protection, and 100% clarity as Parylene can coat optical components. On the flipside, the capital costs are high, preparation can be challenging, and it requires the highest masking level.
Who is Nexus?
Nexus brings together the accumulated knowledge of a group of conformal coating and electronics material dispensing consultants who provide a unique service, focused on helping electronics manufacturing clients improve their conformal coating and electronics materials processes.
Nexus operate across North America, Europe and Asia and can provide a unique perspective to the rapidly growing conformal coating and electronics materials industry. Expertise is held in liquid and parylene coating, capital equipment sales and specifications and material, equipment and process specification, troubleshooting and training.