Material for scrubbing Cu-clad boards
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From: JeffM on 16 Mar 2010 21:24 >>pimpom wrote: >>it's not available where I am. >> John Larkin wrote: >In supermarkets here, we have several brands of kitchen sponges >that have generic Scotchbrite on one side. > ....and even if you can't walk down to the corner to get one... http://google.com/froogle?q=intitle:ScotchBrite+intitle:green&scoring=p&num=100
From: D from BC on 16 Mar 2010 21:28 In article <tq3vp5dmtdf9mocsa1dbdqot57l62un6vh(a)4ax.com>, jjlarkin(a)highNOTlandTHIStechnologyPART.com says... > > On Tue, 16 Mar 2010 16:21:22 +0530, "pimpom" <pimpom(a)invalid.invalid> > 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. > > > > Scotchbrite, with soapy water. When scotchbrite was first invented, it > was a very expensive industrial product and one of the first markets > was PCB fabbers. Years later it became a household product. > > Use the green kind, the more agressive stuff, not the gentle version. > > John Yup..That's what I use. Or whatever generic synthetic scouring pad I can get. In the past I've tried Rag with abrasive( Vim, toothpaste, baking soda),400 grit wet sanding paper, copper wool and steel wool.
From: John Larkin on 16 Mar 2010 22:42 On Tue, 16 Mar 2010 18:28:02 -0700, D from BC <myrealaddress(a)comic.com> wrote: >In article <tq3vp5dmtdf9mocsa1dbdqot57l62un6vh(a)4ax.com>, >jjlarkin(a)highNOTlandTHIStechnologyPART.com says... >> >> On Tue, 16 Mar 2010 16:21:22 +0530, "pimpom" <pimpom(a)invalid.invalid> >> 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. >> > >> >> Scotchbrite, with soapy water. When scotchbrite was first invented, it >> was a very expensive industrial product and one of the first markets >> was PCB fabbers. Years later it became a household product. >> >> Use the green kind, the more agressive stuff, not the gentle version. >> >> John > >Yup..That's what I use. Or whatever generic synthetic scouring pad I can >get. > >In the past I've tried Rag with abrasive( Vim, toothpaste, baking >soda),400 grit wet sanding paper, copper wool and steel wool. Scotchbrite also removes the burrs that you get from x-acto hacking copperclad to make prototypes. This one ftp://jjlarkin.lmi.net/BB_fast.JPG was hand-hacked and then scrubbed hard with soapy water and Scotchbrite. Solder practically leaps onto it, at least for a few days until it tarnishes. That's an EL gate driving a gaasfet, making a 5-volt p-p square wave at 1 GHz. John
From: Joe on 16 Mar 2010 23:06 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.
From: Robert Roland on 17 Mar 2010 05:42
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. -- RoRo |