Troubleshooting Bubbles: Pro Tip #25
PVA Pro Tip #25: Tips for Managing Air Entrapment
Air in Your Coating?
Entrapped air in your liquid conformal coating can cause bubbles to appear in your process resulting in reliability issues down the road. In this series, we are going to explore a few issues that can cause bubbles in your coating process and how to troubleshoot this common issue.
Starting with your coating material and supply system, it is not unusual for formal coatings to absorb air when pressurized for long periods. This is especially prevalent in moisture-sensitive or solvent-based coatings. If using larger reservoirs packaging your coating in bladder bags can help prevent air absorption. For smaller volumes, cartridges or syringes with a piston can prevent direct contact with air. For an added element of safety, many formulators will suggest pressurizing their coatings with nitrogen as opposed to shop air. Finally, remember to depressurize your material reservoir at night or during any long breaks in production.
For more information on how to keep bubbles out of your conformal coating process, contact PVA today and let us help make you a pro.