Electronics > Beginners
isopropanol question
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windsmurf:
I think the IPA is damaging the clear gloss coating on the board, and making it cloudy. 
Put some IPA on the board where its glossy, and let it sit.  See if the glossyness has faded to a flat finish.

If you think its IPA containing residue, test on a piece of glass to see if it leaves residue once it dries.
KL27x:
^OP's pic looks like a professionally manufactured board. It most likely has an epoxy based soldermask, like 99% of professionally manufactured PCBs. This would be pretty much immune to alcohol.
ebastler:

--- Quote from: windsmurf on June 29, 2019, 08:10:13 pm ---I think the IPA is damaging the clear gloss coating on the board, and making it cloudy. 
Put some IPA on the board where its glossy, and let it sit.  See if the glossyness has faded to a flat finish.

--- End quote ---

Very unlikely. As others have stated above, there are stronger solvents than IPA. One benefit of IPA is that it does not dissolve things you don't want to be attacked -- plastics etc.. It also has been safe on any paint or lacquer coatings I have tried it on (once the paint is properly cured, of course). I am not aware of any solder masks which get attacked by IPA.


--- Quote ---If you think its IPA containing residue, test on a piece of glass to see if it leaves residue once it dries.

--- End quote ---

I don't think anybody has suggested that the IPA contained residue to start with. It is flux that was dissolved and then allowed to dry again on the board when the IPA evaporated.
windsmurf:

--- Quote from: ebastler on June 29, 2019, 08:41:11 pm ---
--- Quote from: windsmurf on June 29, 2019, 08:10:13 pm ---I think the IPA is damaging the clear gloss coating on the board, and making it cloudy. 
Put some IPA on the board where its glossy, and let it sit.  See if the glossyness has faded to a flat finish.

--- End quote ---

Very unlikely. As others have stated above, there are stronger solvents than IPA. One benefit of IPA is that it does not dissolve things you don't want to be attacked -- plastics etc.. It also has been safe on any paint or lacquer coatings I have tried it on (once the paint is properly cured, of course). I am not aware of any solder masks which get attacked by IPA.

--- End quote ---

I agree its unlikely but putting it out there as my speculation in case there's a problem with the mask.


--- Quote from: ebastler on June 29, 2019, 08:41:11 pm ---
--- Quote from: windsmurf on June 29, 2019, 08:10:13 pm ---
If you think its IPA containing residue, test on a piece of glass to see if it leaves residue once it dries.

--- End quote ---

I don't think anybody has suggested that the IPA contained residue to start with. It is flux that was dissolved and then allowed to dry again on the board when the IPA evaporated.

--- End quote ---

Also just proposing an experiment to rule out a potential contamination of the bottle of IPA... are there any "rules" on what the remaining percentage of IPA can be? 

GreyWoolfe:
I have both 91% and 99.5% IPA.  I use both with Kim-wipes and an old toothbrush.  IPA on Kim-wipe and scrub, repeat until flux is gone.  No white residue.
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