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Mon, 14 Oct 2013 15:02:01 -0700 (PDT) | |
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Date: | Mon, 14 Oct 2013 18:02:01 -0400 |
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Subject: | Re: [geda-user] Cheap solder paste source? |
From: | Rob Butts <r DOT butts2 AT gmail DOT com> |
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--047d7b343eca1f295b04e8ba9e79 Content-Type: text/plain; charset=ISO-8859-1 I don't mind spending $$$ for good quality known to work well. Digikey has three 9 oz jars for $40, $68 and $90 all claiming 63/37 percentages. I'm not sure what the difference is. I'd love for someone to recommend a source for known good solder paste. On Mon, Oct 14, 2013 at 5:35 PM, Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>wrote: > Be careful ! > > I bought some cheap Chinese "sparkle paste" from fleabay that claimed to > be 63/37 tin lead solder paste. > Having tested it, I have developed a theory of how they make it: > > 1. Start with a stack of industrial waste PCBs or floor sweepings from a > desoldering shop > 2. Grind into a fine powder > 3. Separate out the densest 30% of the powder by rinsing / centrifuging > 4. Mix with toothpaste until it looks about right > 5. sell on fleabay > > This stuff doesn't melt cleanly, it's more like half melting / half > burning until you are left with a molten slag with some silvery metallic > bits mixed in with lots of smouldering grey ash (presumably the remnants of > the fibreglass parts of the PCBs). > > Complete junk. > > For real work I use freshly purchased solder paste from a good brand. I > prefer 63/37 tin lead and only use RoHS if I must. > > Good paste is worth the high price when you see just how forgiving it can > be - I'm amazed at how often I can accidentally smear the paste during > application but still end up with beautiful short free solder joints. > > > > > > On Tue, Oct 15, 2013 at 7:00 AM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote: > >> For those who use solder paste I'm looking for a cheap solder paste that >> contains lead. >> >> Thanks >> > > > > -- > Stephen Ecob > Silicon On Inspiration > Sydney Australia > www.sioi.com.au > --047d7b343eca1f295b04e8ba9e79 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>I don't mind spending $$$ for good quality known = to work well.</div><div>=A0</div><div>Digikey has three 9 oz jars for $40, = $68 and $90 all claiming 63/37 percentages.=A0 I'm not sure what the di= fference is.</div> <div>=A0</div><div>I'd love for someone to recommend a source for known= good solder paste.</div></div><div class=3D"gmail_extra"><br><br><div clas= s=3D"gmail_quote">On Mon, Oct 14, 2013 at 5:35 PM, Stephen Ecob <span dir= =3D"ltr"><<a href=3D"mailto:stephen DOT ecob AT sioi DOT com DOT au" target=3D"_blank">= stephen DOT ecob AT sioi DOT com DOT au</a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"><div dir=3D"ltr">Be careful !<div><br></div>= <div>I bought some cheap Chinese "sparkle paste" from fleabay tha= t claimed to be 63/37 tin lead solder paste.</div> <div>Having tested it, I have developed a theory of how they make it:</div> <div><br></div><div>1. Start with a stack of industrial waste PCBs or floor= sweepings from a desoldering shop</div><div>2. Grind into a fine powder</d= iv><div>3. Separate out the densest 30% of the powder by rinsing / centrifu= ging</div> <div>4. Mix with toothpaste until it looks about right</div><div>5. sell on= fleabay</div><div><br></div><div>This stuff doesn't melt cleanly, it&#= 39;s more like half melting / half burning until you are left with a molten= slag with some silvery metallic bits mixed in with lots of smouldering gre= y ash (presumably the remnants of the fibreglass parts of the PCBs).</div> <div><br></div><div>Complete junk.</div><div><br></div><div>For real work I= use freshly purchased solder paste from a good brand. =A0I prefer 63/37 ti= n lead and only use RoHS if I must.</div><div> <br></div><div>Good paste is worth the high price when you see just how for= giving it can be - I'm amazed at how often I can accidentally smear the= paste during application but still end up with beautiful short free solder= joints.</div> <div><br></div><div><br></div><div><br></div></div><div class=3D"gmail_extr= a"><div class=3D"im"><br><br><div class=3D"gmail_quote">On Tue, Oct 15, 201= 3 at 7:00 AM, Rob Butts <span dir=3D"ltr"><<a href=3D"mailto:r DOT butts2 AT gm= ail.com" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding= -left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-l= eft-style:solid"><div dir=3D"ltr"><div>For those who use solder paste I'= ;m looking for a cheap solder paste that contains lead.</div> <div> =A0</div><div>Thanks</div></div> </blockquote></div><br><br clear=3D"all"><div><br></div></div><span class= =3D"HOEnZb"><font color=3D"#888888">-- <br>Stephen Ecob<br>Silicon On Inspi= ration<br>Sydney Australia<br><a href=3D"http://www.sioi.com.au" target=3D"= _blank">www.sioi.com.au</a><br> </font></span></div> </blockquote></div><br></div> --047d7b343eca1f295b04e8ba9e79--
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