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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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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
>

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<div dir=3D"ltr"><div>I don&#39;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&#39;m not sure what the di=
fference is.</div>
<div>=A0</div><div>I&#39;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">&lt;<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>&gt;</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 &quot;sparkle paste&quot; 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&#39;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&#39;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">&lt;<a href=3D"mailto:r DOT butts2 AT gm=
ail.com" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>&gt;</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&#39=
;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>

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