Yellow Epoxy Like Material on PCB?

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Discussion Overview

The discussion revolves around the identification and removal of a yellow epoxy-like material found on a printed circuit board (PCB). Participants explore the nature of the material, its potential purpose, and methods for its removal, focusing on safety and the integrity of the PCB.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest that the yellow material could be a two-part polyurethane used for protecting components from environmental damage.
  • There is a question about the voltage level of the PCB, with one participant confirming it is a 12 V DC circuit, implying it is not high voltage.
  • Participants discuss potential methods for removing the material, including the use of paint strippers like dichloromethane, while emphasizing the need for caution due to the hazardous nature of such chemicals.
  • One participant raises a question about the necessity of removal, suggesting that knowing the exact nature of the material could inform the choice of removal method.

Areas of Agreement / Disagreement

Participants express varying opinions on the identification of the yellow material and the best approach for its removal. There is no consensus on the exact nature of the material or the safest removal method.

Contextual Notes

Limitations include uncertainty about the chemical properties of the yellow material and the potential risks associated with removal methods. The discussion does not clarify the effectiveness of the proposed removal techniques.

Who May Find This Useful

Individuals interested in electronics repair, PCB maintenance, or material science may find this discussion relevant.

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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