Material for scrubbing Cu-clad boards
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From: pimpom on 17 Mar 2010 06:49 Joe wrote: > On Tue, 16 Mar 2010 14:31:39 -0700, John Larkin wrote: >> On Wed, 17 Mar 2010 00:18:21 +0530, "pimpom" wrote: >>> tlbs101 wrote: > ... >>>> I'm with John... I use a Scotchbrite pad with soap, too. >>>> Tom P. >>> >>> I have no reason to doubt that Scotchbrite works well, but >>> it's not >>> available where I am. >>> >>> >> Where's that? In supermarkets here, we have several brands of >> kitchen >> sponges that have generic Scotchbrite on one side. They work >> great to >> clean up pc boards. > > He probably is in or near Tripura, Mizoram, or Manipur, > some Indian States that are 300-500 Km east of Kolkata. That's right. I'm in Aizawl, Mizoram.
From: Archimedes' Lever on 17 Mar 2010 08:53 On Wed, 17 Mar 2010 10:42:32 +0100, Robert Roland <fake(a)ddress.no> wrote: >On Tue, 16 Mar 2010 04:55:53 -0700, Archimedes' Lever ><OneBigLever(a)InfiniteSeries.Org> wrote: > >>The acid is going to eat it off of ALL the unmasked areas and a little >>tarnish wont stop it. > >It depends on the acid. Ferric chloride, which is popular among >hobbyists, is stopped even by a fingerprint. > >If you use toner transfer, it is essential that the copper is clean, >otherwise the toner will not stick reliably. A laser printer prints on both conductive and non-conductive surfaces, but you want clean copper because you want the resist directly on the copper, not on a fingerprint.
From: krw on 17 Mar 2010 18:50 On Wed, 17 Mar 2010 16:19:09 +0530, "pimpom" <pimpom(a)invalid.invalid> wrote: >Joe wrote: >> On Tue, 16 Mar 2010 14:31:39 -0700, John Larkin wrote: >>> On Wed, 17 Mar 2010 00:18:21 +0530, "pimpom" wrote: >>>> tlbs101 wrote: >> ... >>>>> I'm with John... I use a Scotchbrite pad with soap, too. >>>>> Tom P. >>>> >>>> I have no reason to doubt that Scotchbrite works well, but >>>> it's not >>>> available where I am. >>>> >>>> >>> Where's that? In supermarkets here, we have several brands of >>> kitchen >>> sponges that have generic Scotchbrite on one side. They work >>> great to >>> clean up pc boards. >> >> He probably is in or near Tripura, Mizoram, or Manipur, >> some Indian States that are 300-500 Km east of Kolkata. > >That's right. I'm in Aizawl, Mizoram. Neat, India to the East of Bangladesh.
From: Sarason on 18 Mar 2010 01:21 On 16/03/2010 9:51 PM, pimpom wrote: > This is for those of you who are making their own PCBs for hobby, > prototyping and low-volume production. > > I've seen things like fine sandpaper and steelwool recommended on > hobbyist websites for cleaning copper-clad boards prior to > transferring the pattern and etching. 40 years ago, I used wood > ash. It worked quite well but wasn't always readily available. > Then I tried tooth powder as it's more abrasive than toothpaste. > It sort of worked, but required too much scrubbing. Then I got > the idea of using household scrubbing powder. It works fast, > having just the right amount of abrasive property with no danger > of inflicting deep scratches. Vim and Biz are two popular Indian > brands. > > I feel no need to look for a better material, but I'm curious > about what others are using. > > After many years of research and cribbing from professional PCB manufacturer techniques. There is a trick to this. Industrial manufacturers go alkaline clean. A good product with NaOH detergent like dish washing detergent. Then a weak acid cleaner. like 5% Ammonium Persulfate. This microetchs the surface to allow good adhesion of the dry film. The acid removes the copper oxide while the alkaline solution strips any grease from fingerprints etc.
From: pimpom on 19 Mar 2010 13:44
krw(a)att.bizzzzzzzzzzzz wrote: > On Wed, 17 Mar 2010 16:19:09 +0530, "pimpom" > <pimpom(a)invalid.invalid> > wrote: > >> Joe wrote: >>> On Tue, 16 Mar 2010 14:31:39 -0700, John Larkin wrote: >>>> On Wed, 17 Mar 2010 00:18:21 +0530, "pimpom" wrote: >>>>> tlbs101 wrote: >>> ... >>>>>> I'm with John... I use a Scotchbrite pad with soap, too. >>>>>> Tom P. >>>>> >>>>> I have no reason to doubt that Scotchbrite works well, but >>>>> it's not >>>>> available where I am. >>>>> >>>>> >>>> Where's that? In supermarkets here, we have several brands >>>> of >>>> kitchen >>>> sponges that have generic Scotchbrite on one side. They work >>>> great to >>>> clean up pc boards. >>> >>> He probably is in or near Tripura, Mizoram, or Manipur, >>> some Indian States that are 300-500 Km east of Kolkata. >> >> That's right. I'm in Aizawl, Mizoram. > > Neat, India to the East of Bangladesh. Yep. Joined to the main part of India by a narrow strip of Indian territory to the north-west of Bangladesh. |