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June 1999

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"TechNet E-Mail Forum." <[log in to unmask]>, Tong HH" <[log in to unmask]>
Date:
Sun, 6 Jun 1999 11:02:03 +0800
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    Dear Francis ,

    There are few possibilities which could hlep you narrow down the
    problem :-

    1.Check your palladium bath concentration .
    2.Check the electroless copper bath air agitation
    3.Check the electroless copper bath auto dosing of formaldehye , caustic
      and copper rate .Do set up a calibration on a weekly basis the dosing
      rate and also a daily weight gain control .With the irregular dosage
      of formaldhedye and high air agitation , chances of this happening is
      high .However , do not overlook at the digital copper level indicator
      as it may also sometimes be faulty .(If you have a unit)


    Hope the above could assist you in your troubleshooting .

    HH

>Have you checked the plating rate , it sounds as if the electroless copper
>bath is over active causing nodular copper growth
>I am assuming you are using high build, which Macdermid electroless is it ?
>(I am ex Macdermid Technical Sales in UK)
>
>----- Original Message -----
>From: Francis Lai <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: 05 June 1999 01:56
>Subject: [TN] PTH Problem
>
>
>> We use the Macdermid PTH line. Recently, after PTH there are fluffy,
>> small minute copper deposits around the drilled holes besides the
>> electroless copper on the PTH walls. The copper surface of the panel
>> looked porous. After copper plating, they became pits on the surface of
>> the panel and nodules on the PTH walls.
>> Can any one help?
>> My e-mail : [log in to unmask]
>> THANKS!!!!!!!
>>
>> Francis
>>
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