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Date: | Thu, 26 Sep 1996 09:36:47 EDT |
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On Wed, 25 Sep 1996 16:20:46 +0000 george <[log in to unmask]>
writes:
>
>Doug
>Perhaps I've been around too long, but, with a smile, I can remember
>.....
>
>One part isopropol, one part water, one part Lemon Joy makes a fine IR
>reflow flux
>also. (adjust pH to 1-2 with HCl). Black Jack Molasses used to be
>The copper
>brightner of choice. Spray cans of "Static Gaurd" can help keep the
>static charge
>down in the printing exposure frame. Chrome plate likes uric acid as
>a brightner.
>I won't go into how they figured that out. Toothpastes containing
>diatomaceous
>earth do OK as a polish on micro-sections. Certian Shampoos will work
>as anti-pit
>agents in the Nickel plater. Autobody epoxy works as a quick cross
>section mount.
>Never tried Tarn-X as a flux, but it does work as a solder brightner,
>and helped at
>the old reflective AOI machines to quickly get the copper bright.
>Pencils and a
>cotton ball work as a brush gold plating anode. There was something
>disgusting
>which once was used in Tin-Lead/HBF3 platers before peptone...
>
>Walmart can supply some PWB product needs, and you get wat you pay
>for. Just
>because there are suppliers who charge big bucks for supplies doesn't
>mean there
>isn't other stuff out there that works, at least 60% as well.
>Sometimes 60% is
>good enough. The problem is, you gotta know when 60% isn't good
>enough.
>
>
>By the way, just what surface insulation resistance would one get on a
>board which
>was washed in Cascade after hot air solder level? I've understood it
>had been
>tested and found it "passed" the "Omegameter" test. Does that mean
>better than
>60%?
>
>In search of better uses for Tobasco,
>George Franck
>
>
>Darn, there is a great mold release (non-silicone) for the lamination
>press pins
>and plates, and I can't remember it.
>
George, You may be thinking of PAM Spray?
Sorry I just couldn't resist.....
Scott
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