How do you inspect conformal coating?
How do you inspect conformal coating?
Most conformal coatings now carry an optical brightener which, when exposed to ultraviolet (UV) light, fluoresces. This, in turn, allows easier inspection. However, some defects cannot be seen under UV and white (natural) light may also be needed.
Why is conformal coating used?
Why do I need a Conformal Coating? Conformal coatings can be used in a wide range of environments to protect printed circuit boards from moisture, salt spray, chemicals and temperature extremes in order to prevent such things as corrosion, mould growth and electrical failures.
Which type of coating process is used to apply as conformal coating on PCB?
Selective coating – An automated conformal coating process that uses programmable robotic spray nozzles to apply the conformal coating to very specific areas on the circuit board. This process is used in high volume processes and can eliminate the need for masking.
What is the maximum magnification allowed when inspecting conformal coating?
4X
[3] Physical appearance can be easily verified by visual inspection. Magnification may be used up to 4X.
How do you measure conformal coating thickness?
After placing the comb into the wet coating film, the thickness can be measured in microns or mils and is determined by the number between the last tooth coated and the following tooth which is coating-free. In the example shown in the right, the wet film thickness measures between 100 and 120 microns.
What is G3 conformal coating?
G3 Harsh. High probability that corrosive attacks will occur. This harsh level should prompt further evaluation and result in environmental controls or specially designed and packaged equipment.
What is conformal coating on circuit boards?
Conformal coating is a specially engineered polymeric film-forming product that protects circuit boards, components, and other electronic devices from harmful environmental conditions like moisture, thermal shock, static, vibration, and contamination.