I'm not happy promoting such a blend. The basic substance in this
mixture is a mixture of hydrofluoroethers, with very high GWPs (one of
them has a GWP approaching 200 times that of CO2. Because these are very
poor solvents, they are blended with trans-1,2-dichloroethene, which is
a good solvent with characteristics and toxicity much like
trichloroethylene, including its attack of many plastics. Then there is
a smidgeon of IPA to pay lip service to ionic contaminants. The
packaging is such that all these components are vaporised, usually close
to the operators face. Because the product is expensive, one tends not
to be profligate with it, so you spray it on the assembly sufficient to
spread the flux residues over a larger area where they will dry on the
board invisibly or partly so and leave them there where they will do
the most harm, having harmed the environment and the operator in the
meanwhile.
Such products, if used correctly (rarely done in practice), may be
useful for the odd field repair but in production, never.
Brian
John Goulet wrote:
> For cleaning PCAs after repair or post wave assembly this new product by 3M is great. No more worry about No-Cleans turning white like other flux removers. Cleans OA, water soluble fluxes also. 3M Novec (tm) Aerosol Flux Remover (12oz can) (Brands / 3M / 3M ... 3M � Novec� Flux Remover uses advanced 3M solvent technology to clean rosin solder fluxes , ... 3M Novec (tm) Aerosol Contact Cleaner (11oz can) HFE-7100 ... http://www.galladechem.com/catalog/3m/3m-novec-tm-aerosol-flux-remover--12oz-can.htm - 16k - Cached  - Similar pages From John Goulet,  [log in to unmask]
> ----- Original Message -----
> From: "Joseph E Kane (US SSA)" <[log in to unmask]>
> To: [log in to unmask]
> Sent: Thursday, January 22, 2009 5:03:06 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [TN] No Clean that can be removed?
>
> We use Vigon A200 solution very successfully for cleaning RMA (as well
> as an OA flux), but I wouldn't therefore characterize rosin-based
> fluxes as "water washable". Â Maybe I'm confusing "water washable" with
> "water soluble". Â Never mind.
>
> Question though - anyone have experience with both Vigon A200 and
> Kyzen 4625B, and would comment on the relative merits?
>
> Joe Kane
> BAE Systems
> Johnson City, NY
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Wednesday, January 21, 2009 4:03 PM
> To: [log in to unmask]
> Subject: Re: [TN] No Clean that can be removed?
>
> I knew Technet could depend (ka-ching) on you, Doug!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
> Sent: Wednesday, January 21, 2009 2:58 PM
> To: [log in to unmask]
> Subject: Re: [TN] No Clean that can be removed?
>
> Bob,
> We use Indium SMQ-92J and Alpha UP-78M as solder pastes. Â Both are
> cleaned well with Kyzen Aquanox A4520 in an in-line cleaning process.
>
> Doug Pauls
> Rockwell Collins
>
>
>
> Robert Kondner <[log in to unmask]> Sent by: TechNet
> <[log in to unmask]>
> 01/21/2009 02:03 PM
> Please respond to
> [log in to unmask]
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> [TN] No Clean that can be removed?
>
>
>
>
>
>
> Hi,
>
> Â Â For the no clean fluxes that are removed with a saponifier, can you
> name a couple or point me in the right direction?
>
> Â Â I found that some no cleans had a wider temperature/time process
> window than any of the OA fluxes but we never found anything that cleans
> Alpha
> 6100. Â Through hole and rework was forcing up to clean (water based)
> and
> washing the no cleans cause problems.
>
> Â Â The Alpha 6100 was a no clean and a stenciled board could sit for a
> few days without a complete dry out of the paste. But the 6100 residue
> DOES NOT CLEAN OFF in anything I found.
>
> Â Â I would love to find a no clean with a wide temp window and no dry
> out, like the Alpha 6100, but is also easy to remove. My previous
> understanding was all water soluble fluxes were variations on OA flux
> which require cleaning.
>
> Â Â When I saw that 4300 I was very surprised. Is it for real?
>
> Thanks,
> Bob Kondner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Wednesday, January 21, 2009 2:47 PM
> To: [log in to unmask]
> Subject: Re: [TN] Strange Mask Appearance
>
> There are many no-clean residues that are easily cleaned in a good
> machine wash process with a saponifier added.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US
> SSA)
> Sent: Wednesday, January 21, 2009 1:42 PM
> To: [log in to unmask]
> Subject: Re: [TN] Strange Mask Appearance
>
> Steve:
>
> How can a no-clean flux be water-washable? Â If you leave residue on
> there, any moisture encountered in service would attack it, dissolving
> and spreading ionic contaminants, and causing corrosion, shorts, lifting
> of coating.
>
> And if it's something that you must clean anyway, why not use something
> more active, with a wider process window?
>
> Or what am I missing?
>
> -Joe
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Wednesday, January 21, 2009 11:04 AM
> To: [log in to unmask]
> Subject: Re: [TN] Strange Mask Appearance
>
> Hi Bill!
>
> Yes, I would like your photos, thank-you very much.
>
> To respond to Tan Geok Ang, the flux we used for the rework is Amtech
> 4300, a solvent-based (ethanol), water washable no-clean. I know the
> picture looks like the area around the screw heads is delaminated, but
> it is not. The copper is relieved around the holes for the hardware in
> the inner planes and that may contribute to the appearance that there's
> delamination.
>
> Here's a photo of the same exact place on the same exact board after
> doing nothing but heating the PCB up to 125 C. as I described in my
> earlier post.
>
> http://stevezeva.homestead.com/files/Mask_Discoloration_After_Heating.jp
> g
>
> And the "before" photo:
>
> http://stevezeva.homestead.com/files/Mask_Discoloration.jpg
>
> Pretty dramatic change huh?
>
> Steve
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
> Sent: Tuesday, January 20, 2009 1:59 PM
> To: [log in to unmask]
> Subject: Re: [TN] Strange Mask Appearance
>
> Steve- I'm probably the culprit that put that report on TN long ago- and
> again recently. Liquid solder masks often use fumed silica as
> filler/thickener to keep it in place. This is often sold under the
> Cab-O-Sil tradename.
> Aggressive cleaning agents can dissolve off part of the under or un
> cured solder mask polymer, exposing the while silica filler. When you
> heat the undercured mask, it will soften and allow the filler to sink
> down into the polymer, so the solder mask all looks green again.
> Re the curing from wave solder, this may not work if you are working
> with a UV cured mask. That's why it is important to monitor the output
> of UV lamps, which not all shops do, thinking that UV lamps behave the
> same as incandescent
> Â lamps- which they don't.
> Yes, the heat gun is a very inexpensive $0.05 test, quick, easy and
> requires no instrumentation.
> Â
> (Steve- I have some photos of the differences between one, two and three
> passes under UV lamps to show the difference if you'd like them. If so,
> pls give me a mailing address.)
>
> Bill  Kenyon
> Global Centre Consulting
> 3336 Birmingham Drive
> Fort Collins, CO Â 80526
> Tel: 970.207.9586 Â Cell: Â 970.980.6373
>
> **************A Good Credit Score is 700 or Above. See yours in just 2
> easy steps!
> (http://pr.atwola.com/promoclk/100000075x1215855013x1201028747/aol?redir
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> 6bcd=De
> cemailfooterNO62)
>
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