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Re: Removing photoresist


 

On 13/10/21 8:11 pm, Morris Odell wrote:
Hi all,
I picked up a large sheet of surplus single sided copper clad board that is coated with a reddish colored photoresist. I don't know anything about it or whether it's positive or negative. I would like to remove the photoresist and just leave the copper layer so I can use it for toner transfer. The resist is not affected by acetone, turpentine or naphtha.
Any advice on where to go from here would be much appreciated.
It's likely to have a plastic film layer to protect it from air.

Lift a corner of it using the stickiness of some stick tape, to get it to peel.

Heat sodium hydroxide NaOH (garage/concrete floor cleaner or over cleaner) in a microwave to over 30degC (higher the better).

Put PCB in and the resist starts lifting in a minute.

If the PCB is small enough, put in the cold NaOH and then put it all in the microwave.

NaOH only needs to be 10g/Lt of water

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