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Date: Tue, 15 Oct 2013 08:35:33 +1100
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Subject: Re: [geda-user] Cheap solder paste source?
From: Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>
To: geda-user AT delorie DOT com
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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">Be careful !<div style><br></div><div style>I bought some =
cheap Chinese &quot;sparkle paste&quot; from fleabay that claimed to be 63/=
37 tin lead solder paste.</div><div style>Having tested it, I have develope=
d a theory of how they make it:</div>
<div style><br></div><div style>1. Start with a stack of industrial waste P=
CBs or floor sweepings from a desoldering shop</div><div style>2. Grind int=
o a fine powder</div><div style>3. Separate out the densest 30% of the powd=
er by rinsing / centrifuging</div>
<div style>4. Mix with toothpaste until it looks about right</div><div styl=
e>5. sell on fleabay</div><div style><br></div><div style>This stuff doesn&=
#39;t melt cleanly, it&#39;s more like half melting / half burning until yo=
u 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 pa=
rts of the PCBs).</div>
<div style><br></div><div style>Complete junk.</div><div style><br></div><d=
iv style>For real work I use freshly purchased solder paste from a good bra=
nd. =A0I prefer 63/37 tin lead and only use RoHS if I must.</div><div style=
>
<br></div><div style>Good paste is worth the high price when you see just h=
ow forgiving it can be - I&#39;m amazed at how often I can accidentally sme=
ar the paste during application but still end up with beautiful short free =
solder joints.</div>
<div style><br></div><div style><br></div><div style><br></div></div><div c=
lass=3D"gmail_extra"><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:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>For those who use sold=
er 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>-- <br>Stephen Ecob=
<br>Silicon On Inspiration<br>Sydney Australia<br><a href=3D"http://www.sio=
i.com.au" target=3D"_blank">www.sioi.com.au</a><br>
</div>

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