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May 2008

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Mon, 12 May 2008 15:43:28 -0400
Content-Type:
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Richard,
IF you could find such a dye, you would be able to tell one from the
other, but it would never work for "a little contamination".  The
contaminating solvent would be so dilute (and the dye even more so) you
would never be able to tell. Now if you were talking about a lot of
contamination, that might be a different story.
Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Monday, May 12, 2008 3:32 PM
To: [log in to unmask]
Subject: Re: [TN] Vapor phase

Conformal Coatings don't glow under UV without a dye. I wonder what it
would
do to the solvent cleaning ability. Then there is the red dye they add
to
diesel fuel if it is sold for farm use or heating oil (no highway tax).


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, May 12, 2008 2:04 PM
To: [log in to unmask]
Subject: Re: [TN] Vapor phase

While we are on the subject, does anyone know of a dye that can be added
to
the solvent? We use two solvents, high-temp and low-temp. Both go into a
single machine and it is difficult to keep track of what is in the
machine
and to what level we have a little cross-contamination. A dye would
certainly help. I have not been able to find a solution to the problem
at
Galden or 3M. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Monday, May 12, 2008 12:30 PM
To: [log in to unmask]
Subject: Re: [TN] Vapor phase

Brian,
Are you sure?  From Solvay's own website:

"Solvay Solexis offers the Galden(r) PFPE line of lower molecular weight
(LMW) fluorinated fluids. Galden fluids are perfluoropolyethers and
contain
only carbon, fluorine, and oxygen."

Last I heard the Montreal Protocol only dealt with chlorofluorocarbons,
bromofluorocarbons and some chlorinated solvents.  Or is there an
addendum
that I don't know about?  Interesting that in the listed properties, of
the
two I looked at, there is no GWP value listed.

If I Google Galden GWP I get:
H Galden HFPEs have a global warming potential (GWP) that varies for the
particular fraction, ranging from 2790 to 6230 for the fractions having
the
highest ...
www.epa.gov/EPA-AIR/2003/January/Day-27/a1623.htm - 67k

AND

They are used as solvents and heat transfer fluids and have zero ODP and
low
GWP. H-Galden HFPE fluids are linear fluoropolyethers end-capped with a
...
www.solvaysolexis.com/products/bybrand/brand/0,,16050-2-0,00.htm - 200k
-

HMMMM....

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, May 12, 2008 11:49 AM
To: [log in to unmask]
Subject: Re: [TN] Vapor phase

Oh! OOOOH! BIG environmental concerns with Galden. GWP in the tens of
thousands (CO2 = 1), pretty well on a par with SF6. These PFCs are
controlled substances under the Kyoto Protocol.

Brian

Bill Kasprzak wrote:
> Gosh, with all due respect, I'm sure the equipment is using the Galden

> fluid for vapor and that drag out if any is minimal. No environmental 
> concerns as far as I can tell.
> 
> I think vapor phase will be the comeback kid in the years to come
because 
> of the even distribution of heat. (We do not have any lead-free
soldering 
> issues here)
> 
> What I'm really talking about out is how inconsequential our impact on

> global warming compared to the enormous volcanic eruption in Chile.
Some 
> of the photo's are incredible. Maybe Steve can post them. I think they
are 
> available from the UK's Daily mail website.
> 
> What's happening right now in Chile is a huge environmental disaster
and 
> no one, no laws, no regulations can do anything about it. It just
shows 
> how inconsequential we really are.
> 
> 
> 
> 
> Bev Christian <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 05/12/2008 09:26 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to Bev 
> Christian <[log in to unmask]>
> 
> 
> To
> [log in to unmask]
> cc
> 
> Subject
> Re: [TN] Vapor phase
> 
> 
> 
> 
> 
> 
> Ioan,
> Ask the supplier what is the global warming potential of the materials

> they are proposing as the thermal transfer material.  Then you have to

> decide if you can live with the answer.
> 
> Also, RF cans with small holes can be problematic.
> 
> Bev
> RIM
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
> Sent: Monday, May 12, 2008 9:24 AM
> To: [log in to unmask]
> Subject: [TN] Vapor phase
> 
> Dear Technos,
> 
>  
> 
> I would like to get your expert opinion on the latest developments in 
> the vapour phase technology. The last time this topic has been
discussed
> here this was still an environmental hazard.
> 
>  
> 
> Here's the latest sales pitch:
> 
>  
> 
> Dear Convection Oven Users:
> 
> With Energy Costs Skyrocketing, You have a cheaper, efficient, and a 
> better yield Alternative!!
> 
> Low Operating Cost, 110 Volt Machine, Run Lead and Lead Free 
> Sequentially!!
> 
> High Yield, Run your Lead Free Boards at 230 Degrees Uniform
Temperature
> Distribution, No Circuit Board Delamination, Uses Environmentally 
> Friendly Teflon 2 Liquid No Hazardous Florocarbons!
> 
>  
> 
> The questions are:
> 
> *       Are the advantages real, should I prefer vapour phase over
> convection in day by day reflow operations, from the technical point
of
> view?
> 
> *       Would the technology finally be environmentally friendly?
> 
>  
> 
> Thanks,
> 
>  
> 
> Ioan
> 
>  
> 
> 
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