NPL defect database service always open for business
National Physical Laboratory, NPL, has created an interactive assembly and soldering defect database, each month readers can add other defect solution to their own collection. The database allows engineers to search and view countless defects and solutions or submit their defects on-line for recommendations at http://defectsdatabase.npl.co.uk/.
This month we feature one recent issue submitted to the database on missing conformal coating but is it?
Actually this is a satisfactory board assembly after coating. This board assembly has a Parylene coating which is around 15μm in thickness on all surfaces of the board and components. Based on the process the coverage and thickness is virtually guaranteed. It is difficult to see the coating due to the process and the type of material used so it’s not a defect. Most conformal coatings are fairly easy to inspect visually with UV light, however one of the best coatings in terms of performance is difficult to see. This coating is more expensive than most and the process is normally subcontracted.
It is sometimes possible to see the coating under higher magnification on the side of the components close to the board surface, normally when a thicker coating has been applied. Inspection can also be easier if a QC label is placed on the surface of the board prior to coating or if it’s possible to compare the solder mask surface with and without coating.
The NPL Database is available to readers to search for solutions 24/7 or submit your own problems/examples online to obtain a possible solution at http://defectsdatabase.npl.co.uk/.
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