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Date: Tue, 15 Oct 2013 08:58:46 -0400
Message-ID: <CALSZ9goQgNMkwUHJOeUvSHho3dDHefyR=nW6V4iyqmS6zzNF3A@mail.gmail.com>
Subject: Re: [geda-user] Cheap solder paste source?
From: Rob Butts <r DOT butts2 AT gmail DOT com>
To: geda-user AT delorie DOT com
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Please don't top-post!
What do you mean by top-post?

You need smaller solder particles (more $$) for smaller holes in your paste
stencil.

This begs the question, where do you get your paste stencils?  From the fab
shop who makes your boards?

I've also seen some videos showing for ic soldering a strip of solder paste
along the top of the pins works for non-stenciled.


On Tue, Oct 15, 2013 at 4:30 AM, Gabriel Paubert <paubert AT iram DOT es> wrote:

> On Mon, Oct 14, 2013 at 06:02:01PM -0400, Rob Butts wrote:
> > 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.
> >
> >
>
> Please don't top-post!
>
> As Dj said, price varies with flux type (no-clean or not), and more so
> with particle size: the cheapest ones are too coarse for very fine pitch.
>
> The rule of thumb is that the smallest aperture of your stencils should
> be at least five times the particle size.
>
> I have been using leaded solder paste from Koki
> (http://www.ko-ki.co.jp/product/product5.html)
> since 2007, and am very satisfied with the results.
>
> The reference I have no more exists, but at least it has in practice a
> much longer shelf life than specified (I keep it in a fridge): the limit
> date on my jar is December 2007 but I used it a few weeks ago without
> trouble to solder relatively small components (Vishay CH-02016 high
> frequeny resistors). Still the particle size was a bit too large for
> the stencil apterture and I'll have to order new paste with smaller
> particles soon (that's the first time I go below 0402).
>
> This said, 9 oz is quite a lot (about what I've used in 7 years, although
> I only build prototypes), how much are you going to build?
>
>         Gabriel
>

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<div dir=3D"ltr"><div>Please don&#39;t top-post!<br></div><div>What do you =
mean by top-post?</div><div>=A0</div><div>You need smaller solder particles=
 (more $$) for smaller holes in your paste stencil.</div><div>=A0</div><div=
>This begs the question, where do you get your paste stencils?=A0 From the =
fab shop who makes your boards?</div>
<div>=A0</div><div>I&#39;ve also seen some videos showing for ic soldering =
a strip of solder paste along the top of the pins works for non-stenciled.<=
/div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On=
 Tue, Oct 15, 2013 at 4:30 AM, Gabriel Paubert <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:paubert AT iram DOT es" target=3D"_blank">paubert AT iram DOT es</a>&gt;</spa=
n> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On Mon, Oct 14, 2013 at 06=
:02:01PM -0400, Rob Butts wrote:<br>
&gt; I don&#39;t mind spending $$$ for good quality known to work well.<br>
&gt;<br>
&gt; Digikey has three 9 oz jars for $40, $68 and $90 all claiming 63/37<br=
>
&gt; percentages. =A0I&#39;m not sure what the difference is.<br>
&gt;<br>
&gt; I&#39;d love for someone to recommend a source for known good solder p=
aste.<br>
&gt;<br>
&gt;<br>
<br>
</div>Please don&#39;t top-post!<br>
<br>
As Dj said, price varies with flux type (no-clean or not), and more so<br>
with particle size: the cheapest ones are too coarse for very fine pitch.<b=
r>
<br>
The rule of thumb is that the smallest aperture of your stencils should<br>
be at least five times the particle size.<br>
<br>
I have been using leaded solder paste from Koki<br>
(<a href=3D"http://www.ko-ki.co.jp/product/product5.html" target=3D"_blank"=
>http://www.ko-ki.co.jp/product/product5.html</a>)<br>
since 2007, and am very satisfied with the results.<br>
<br>
The reference I have no more exists, but at least it has in practice a<br>
much longer shelf life than specified (I keep it in a fridge): the limit<br=
>
date on my jar is December 2007 but I used it a few weeks ago without<br>
trouble to solder relatively small components (Vishay CH-02016 high<br>
frequeny resistors). Still the particle size was a bit too large for<br>
the stencil apterture and I&#39;ll have to order new paste with smaller<br>
particles soon (that&#39;s the first time I go below 0402).<br>
<br>
This said, 9 oz is quite a lot (about what I&#39;ve used in 7 years, althou=
gh<br>
I only build prototypes), how much are you going to build?<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
=A0 =A0 =A0 =A0 Gabriel<br>
</font></span></blockquote></div><br></div>

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