Ask The Expert: Chris Palin Humiseal, Conformal Coating Materials on Key Conformal Coating Inspection Challenges

“The UV brightener used in conformal coatings can vary from different coating manufacturers. The variation is due to volume or type of brightener used. Generally speaking a high brightness UV tracer will  aid the automatic inspection system to identify that correct coating areas are covered and also look for stray material that may have entered critical keep out areas.”

“Some conformal coatings do not contain UV tracer and this is usually for a reason such as coating over LEDs or optical sensors where the UV tracer could affect light transmission. UV brighteners degrade over time with exposure to UV light therefore the coating on older PCBs may not show up quite as well depending on time and physical location of the board during its operational lifetime.”

Visit the Nexus Associate Experts Section and read what other experts have to say about conformal coating inspection.

Ask The Expert: Dr Lee Hitchens, Nexus on Key Conformal Coating Inspection Challenges

“Considering the Key Inspection Challenges faced by users, then continuity of what people actually require in terms of quality of finish is the biggest problem for conformal coating inspection. Using the standards available are fine but many companies don’t really read them and actually don’t understand them fundamentally.”
“For instance, is it really okay to have debris on the surface of a conformal coated PCB? The IPC IPC-A610 Acceptance Standard states it is okay as long as the, “Foreign material does not violate minimum electrical clearance between components, lands or conductive surfaces”. I guess that most would not consider this okay cosmetically even if technically and electrically this is fine. This discrepancy in understanding is key to inspection”

Visit the Nexus Associate Experts Section and read what other experts have to say about conformal coating inspection.

Ask The Expert: Phil Kinner, PVA, Conformal Coating Robotic Solutions on Key Conformal Coating Inspection Challenges

“Many users are looking to automate their inspection process, in order to increase their quality level.  Systems are available that can integrate a camera and lighting, directly into a selective coating robot, or can be used in a standalone fashion separate machine.”

“There are numerous  challenges involved in automating the inspection process, not least of which is the variation in brightness of fluorescence of the conformal coating materials, both batch-to-batch variations and between different conformal coating materials.  Silicone materials in particular can have very low levels of fluorescence.”

“Other issues relate to the 3D nature of the substrate, light scattering leading to distortion of the images, background fluorescence of metallic solder joints/component leads and tall components or component bodies restricting the field of view, rendering it nearly impossible to inspect beneath or around through hole capacitors and connectors.”

Visit the Nexus Associate Experts Section and read what other experts have to say about conformal coating inspection.

Ask The Expert: Karl Hardcastle, SCH Services Ltd, Subcontract Conformal Coating Service on Key Conformal Coating Inspection Challenges

“One of the interesting points is not all conformal coating defects and problems show up under UV light. You really need to inspect your PCB under white light and UV light to check for different defects. What can look like a perfect coating under UV can cosmetically look awful under normal daylight!”

“Also, you cannot tell how good coating adhesion is with visual inspection only. We examine the PCB as a coating service and if it looks good that’s fine. but without testing we cannot tell how well the conformal coating has adhered.”

Visit the Nexus Associate Experts Section and read what other experts have to say about conformal coating inspection.

Nexus Used Equipment: Reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards

SCH Technologies have a used WS101 Wet Stripping System for removal of conformal coating from printed circuit boards (PCBs).

Multiple tanks with or without pumping system. Hardly used so in fantastic condition.

Contact Nexus3C for further details.

Ref: 003Used

To find or advertise used click Second User Conformal Coating equipment,

Nexus Used Equipment: Reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards

SCH Technologies have a reconditioned WS100 Wet Stripping System for Conformal Coating Removal from Printed Circuit Boards for sale. The system has been used very little and can include pumps or stand alone.

Ref: 003Used.

To find or advertise used click Second User Conformal Coating equipment,

Demo Conformal Coating Dip System available for sale on the Nexus Second User Section

An ex-demo conformal coating dip machine from SCH Technologies is available on the Nexus website.
Nexus 3C offer an advertisement service for second user / demo equipment for conformal coating for OEMs and Suppliers who wish to sell direct to other OEMs.
Also, available right now is an SCS PrecisionCoat 2 valve System for sale. Hardly used.

Contact Nexus3C for further details of the 2nd hand Used Equipment Section of the Nexus Conformal Coating Resource.