C-flux is an acid based product, so clean thoroughly. From the MSDS:
-----------------------------------------------------------------------------
INGREDIENT: Zinc Chloride
PERCENTAGE BY WEIGHT: <20
CAS#: 7646-85-7
EC#: 231-592-0
-----------------------------------------------------------------------------
INGREDIENT: Ammonium Chloride
PERCENTAGE BY WEIGHT: <1
CAS#: 12125-02-9
EC#: 235-186-4
And other, including tin and antimony.
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----- Original Message -----
> From: "Missouri Guy" <n0tt1@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Saturday, January 12, 2013 11:57:25 AM
> Subject: Re: [Homebrew_PCBs] No HASL
> FYI...there is some flux that already has solder particles
> in it. The brand I have in my plumbing supplies is called
> "C-Flux", made in the USA by "Rectorseal" of Houston, TX.
> http://www.rectorseal.com/C-Flux.php Note that there
> are links to the datasheet.
>
> I purchased a 3-oz jar at a surplus store for 59-cents. Amazon
> has it for over $5!!
>
> The product "cleans and tins" in one operation and is lead-free.
> I'm pretty sure there are other brands out there that are
> virutally the same thing. One nice thing about this product
> is that it seems to keep "forever". Just add a little water
> and mix if it starts to dry out.
>
> BTW, the flux in a lot of plumbing products contains forms
> of Chloride, an acid. Be sure to clean ALL of that off the board
> to avoid corrosion problems later on. It is water soluble.
>
> Having said that, I just wonder if this C-Flux stuff could be used
> for SMDs? I.E., in place of the expensive paste that has a shelf
> life. Has anyone ever tried it?
>
> Per the datasheet, avoid breathing in any of the fumes.
>
> Charlie
>
> On Sat, 12 Jan 2013 07:25:51 -0700 "Rick Sparber" <rgsparber@...>
> writes:
>
> ST,
>
> I failed to mention that I am using plumber's solder paste and paint
> the
> board using an old tooth brush. I tried reflowing the paste with my
> hot
> air
> gun but it didn't seem to matter. The brush put it on thin enough.
>
> The SMD paste contains tiny specs of solder so it is not the same as
> plumber's paste. It would be cool if there was a way to take 1/8"
> diameter
> solder and grind it up into tiny particles. Then it could be mixed
> with
> plumber's paste and used to coat the board. Heat the board in a
> toaster
> oven
> and it would be coated. Then wash to remove excess flux.
>
> Rick
>
> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of Stefan Trethan
> Sent: Saturday, January 12, 2013 7:01 AM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] No HASL
>
> You can use plumbing solder paste (with flux) and paint the board with
> it.,
> then you heat the board with hot air or a hotplate..
> The paste can be thinned with water to make it easier to apply, and it
> is
> much cheaper than SMD paste.
> Excess paste in bare areas and flux just washes off with hot water.
>
> There will be lumps if you apply too much or unevenly, in that case
> carefully wipe it off with a paper towel wad while molten.
>
> ST
>
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>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and
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>
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>