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Is this resistor leaking? If so, is it a concern?

Safety of making PCBsPlans / tutorial for sound effect generator using only analog components?Resistance Wire Circuit Safety Around WaterHow to get a variable voltage from a variable resistorSafety/Quality issues by modding PC PSU to be floating.Unusual chemical reaction on PCB (SMPS circuit)Oscilloscope for troubleshooting higher voltages?Protection from leaking capacitors - store upside down?Do I need resistor between NodeMCU and TIP122 TransistorExactly what type of resistor is being referred to in this diagram?

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2

$begingroup$

I found this resistor on the control board of an old Whirpool washing machine:

Is that fluid leaking from the resistor? (Why would that happen?) Could it be something like stray epoxy or a chemical reaction with the substances in the machine like water vapor/soap instead?
If it is fluid or a chemical reaction, what implication does that have for the longevity/safety of the resistor?

resistors safety damage corrosion

share|improve this question

edited 8 hours ago

Nonny Moose

asked 8 hours ago

Nonny MooseNonny Moose

1205

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Resistors contain no fluid. That's capacitors that leak like that.
  $endgroup$
  – Hearth
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Hearth I know. That's why it was so weird to see that. The deposit even has the sort of bubbly pattern that you get when chemicals mix after exiting an enclosure and then dry.
  $endgroup$
  – Nonny Moose
  8 hours ago
  

  
  
  
  

add a comment | 

2

$begingroup$

I found this resistor on the control board of an old Whirpool washing machine:

Is that fluid leaking from the resistor? (Why would that happen?) Could it be something like stray epoxy or a chemical reaction with the substances in the machine like water vapor/soap instead?
If it is fluid or a chemical reaction, what implication does that have for the longevity/safety of the resistor?

resistors safety damage corrosion

share|improve this question

edited 8 hours ago

Nonny Moose

asked 8 hours ago

Nonny MooseNonny Moose

1205

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Resistors contain no fluid. That's capacitors that leak like that.
  $endgroup$
  – Hearth
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Hearth I know. That's why it was so weird to see that. The deposit even has the sort of bubbly pattern that you get when chemicals mix after exiting an enclosure and then dry.
  $endgroup$
  – Nonny Moose
  8 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

I found this resistor on the control board of an old Whirpool washing machine:

Is that fluid leaking from the resistor? (Why would that happen?) Could it be something like stray epoxy or a chemical reaction with the substances in the machine like water vapor/soap instead?
If it is fluid or a chemical reaction, what implication does that have for the longevity/safety of the resistor?

resistors safety damage corrosion

share|improve this question

edited 8 hours ago

Nonny Moose

asked 8 hours ago

Nonny MooseNonny Moose

1205

$endgroup$

share|improve this question

edited 8 hours ago

Nonny Moose

asked 8 hours ago

Nonny MooseNonny Moose

1205

share|improve this question

edited 8 hours ago

Nonny Moose

asked 8 hours ago

Nonny MooseNonny Moose

1205

asked 8 hours ago

Nonny MooseNonny Moose

1205

asked 8 hours ago

Nonny MooseNonny Moose

1205

2 Answers
2

active

oldest

votes

3

$begingroup$

That's a cement block style, wirewound power resistor, sometimes called a square carbon power resistor. They look like this when new:

The one in your circuit board has been mounted upside-down from usual, so you can see the guts of it through the opening slot in the bottom, but that's no big deal.

Like all resistors, this component contains no fluid, so the material that has bubbled was added later. It looks very much like the amber conformal coating material that was popular for that vintage of PCB. It has probably been over-applied and ended up on the power resistor. Naturally it will bubble and discolour when heated. Apart from the odour and aesthetic factors, this is not in itself an electrical issue.

So I'd say with some confidence that there is very little concern about on-going chemical reactions.

share|improve this answer

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

$endgroup$

add a comment | 

2

$begingroup$

No, it's fine (as far as we can tell visually). Maybe some foam got melted onto it or a bit of glue was on there and was heated by the resistor. Those resistors have a ceramic housing, resistance wire winding around a core, and are held in by a type of ceramic cement. No liquids at all.

I wonder why they put the ugly side up. Whatever their reason, it's consistent, and if you search the PCB part number you'll find other examples with the burnt glue or whatever schmoo it is on there.

share|improve this answer

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

$endgroup$

add a comment | 

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3

$begingroup$

That's a cement block style, wirewound power resistor, sometimes called a square carbon power resistor. They look like this when new:

The one in your circuit board has been mounted upside-down from usual, so you can see the guts of it through the opening slot in the bottom, but that's no big deal.

Like all resistors, this component contains no fluid, so the material that has bubbled was added later. It looks very much like the amber conformal coating material that was popular for that vintage of PCB. It has probably been over-applied and ended up on the power resistor. Naturally it will bubble and discolour when heated. Apart from the odour and aesthetic factors, this is not in itself an electrical issue.

So I'd say with some confidence that there is very little concern about on-going chemical reactions.

share|improve this answer

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

$endgroup$

add a comment | 

3

$begingroup$

That's a cement block style, wirewound power resistor, sometimes called a square carbon power resistor. They look like this when new:

The one in your circuit board has been mounted upside-down from usual, so you can see the guts of it through the opening slot in the bottom, but that's no big deal.

Like all resistors, this component contains no fluid, so the material that has bubbled was added later. It looks very much like the amber conformal coating material that was popular for that vintage of PCB. It has probably been over-applied and ended up on the power resistor. Naturally it will bubble and discolour when heated. Apart from the odour and aesthetic factors, this is not in itself an electrical issue.

So I'd say with some confidence that there is very little concern about on-going chemical reactions.

share|improve this answer

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

$endgroup$

add a comment | 

$begingroup$

That's a cement block style, wirewound power resistor, sometimes called a square carbon power resistor. They look like this when new:

The one in your circuit board has been mounted upside-down from usual, so you can see the guts of it through the opening slot in the bottom, but that's no big deal.

Like all resistors, this component contains no fluid, so the material that has bubbled was added later. It looks very much like the amber conformal coating material that was popular for that vintage of PCB. It has probably been over-applied and ended up on the power resistor. Naturally it will bubble and discolour when heated. Apart from the odour and aesthetic factors, this is not in itself an electrical issue.

So I'd say with some confidence that there is very little concern about on-going chemical reactions.

share|improve this answer

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

$endgroup$

share|improve this answer

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

answered 8 hours ago

Heath RafteryHeath Raftery

1,535511

2

$begingroup$

No, it's fine (as far as we can tell visually). Maybe some foam got melted onto it or a bit of glue was on there and was heated by the resistor. Those resistors have a ceramic housing, resistance wire winding around a core, and are held in by a type of ceramic cement. No liquids at all.

I wonder why they put the ugly side up. Whatever their reason, it's consistent, and if you search the PCB part number you'll find other examples with the burnt glue or whatever schmoo it is on there.

share|improve this answer

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

$endgroup$

add a comment | 

2

$begingroup$

No, it's fine (as far as we can tell visually). Maybe some foam got melted onto it or a bit of glue was on there and was heated by the resistor. Those resistors have a ceramic housing, resistance wire winding around a core, and are held in by a type of ceramic cement. No liquids at all.

I wonder why they put the ugly side up. Whatever their reason, it's consistent, and if you search the PCB part number you'll find other examples with the burnt glue or whatever schmoo it is on there.

share|improve this answer

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

$endgroup$

add a comment | 

$begingroup$

No, it's fine (as far as we can tell visually). Maybe some foam got melted onto it or a bit of glue was on there and was heated by the resistor. Those resistors have a ceramic housing, resistance wire winding around a core, and are held in by a type of ceramic cement. No liquids at all.

I wonder why they put the ugly side up. Whatever their reason, it's consistent, and if you search the PCB part number you'll find other examples with the burnt glue or whatever schmoo it is on there.

share|improve this answer

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

$endgroup$

share|improve this answer

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443

answered 8 hours ago

Spehro PefhanySpehro Pefhany

216k5166443