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pcb DRY DILM problem

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5282604

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pcb DRY fILM problem

i buy from china negative dry film.
i use soduim carbonate to developing dry film . after developing i see the copper

when i put pcb in ferric chloride to etching it. the pcb is not etching because there are an Transparent layer of dry dry film " i use a correct layer of dry film i know there is 3layer sandwitch". i try all thing and no solve

are the problem in developer ?
 
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pcbfox

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Re: pcb DRY fILM problem

Did you do samples by yourself ?
 

5282604

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Re: pcb DRY fILM problem

Did you do samples by yourself ?

DSC_0000251.jpg

this photo the pcb in the ferric chloride and the pcb copper not etching and copper still shiny
 

5282604

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are there problem in dry film ?
 

marvelpcb

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from the image it shown that you are etching the pads ? and how do you find the "transparent layers"
 

5282604

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from the image it shown that you are etching the pads ? and how do you find the "transparent layers"

ii have big problem with dry film

i buy from china negative dry film.
i use soduim carbonate to developing dry film . after developing i see the copper good

when i put pcb in ferric chloride to etching it. the some pcb area is not etching because there are an Transparent layer protect copper from etching " i use a correct layer of dry film i know there is 3layer sandwitch". i try all thing and no solve

here is another picture
DSC_0000262.jpg
 

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