Yellow Epoxy Like Material on PCB?

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SUMMARY

The discussion centers on the identification and removal of a yellow epoxy-like material found on printed circuit boards (PCBs). Participants suggest that the material is likely a two-part polyurethane used for protecting components from environmental damage. For removal, dichloromethane is recommended, but caution is advised due to the potential hazards associated with using chemical strippers. The PCB in question operates at 12 V DC, which influences the removal approach.

PREREQUISITES
  • Understanding of PCB components and their protection mechanisms
  • Familiarity with chemical solvents, specifically dichloromethane
  • Knowledge of safe handling practices for hazardous materials
  • Experience with PCB maintenance and repair techniques
NEXT STEPS
  • Research the properties and applications of two-part polyurethane in electronics
  • Learn about safe chemical handling and disposal methods
  • Investigate alternative PCB encapsulation materials and their removal processes
  • Explore best practices for PCB repair and maintenance in low-voltage circuits
USEFUL FOR

Electronics technicians, PCB designers, and hobbyists involved in circuit board repair and maintenance will benefit from this discussion.

BuddyBoy
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I've seen the black epoxy on various pcbs to encapsulate it. I've also seen plenty of times a Clear coating. But this is my first time seeing this yellow stuff? Any idea what it is?
IMG_20240905_224237182.jpg
 
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BuddyBoy said:
But this is my first time seeing this yellow stuff? Any idea what it is?
My guess would be a two part polyurethane, being used there to protect surface components from vibration, physical and environmental damage.
 
Baluncore said:
My guess would be a two part polyurethane, being used there to protect surface components from vibration, physical and environmental damage.
Hey thanks. Any idea on how to remove it without damaging the PCB or what's underneath it?
 
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BuddyBoy said:
Hey thanks. Any idea on how to remove it without damaging the PCB or what's underneath it?
Why do you want to remove it?

If you knew exactly what it was, you could probably find out what the recommended removal chemical is. But as @Baluncore implies, such chemicals are usually pretty dangerous and should not be used unless you have access to a chemical fume hood and experience using hazardous chemicals.
 

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