Bev,
In my haste to reply I said 'VOC taxes' but I meant ozone depletion taxes (I
was thinking of the taxes levied on the CFC's, specifically Freon, which
eventually drove them out of common use).
Thanks for the insight and details on why the fluids are so costly. Sounds
like a very expensive and difficult process. Unfortunately I don't see any
easy answers if one converts to lead free solder.
Jim KIttel
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Tuesday, February 19, 2002 4:54 PM
To: [log in to unmask]
Subject: Re: [TN] Antw: [TN] Vapor Phase Soldering ReVisited!
Jim,
These are expensive because:
1) There are few companies that make them
2) Demand is low
3) Working with fluorine compounds usually ain't cheap. To give you some
idea:
For making perfluoro compounds "A number of reactive metal fluorides have
been employed, including AgF2, PbF4, HgF2 and Co F3, the last being the most
useful. The general reaction may be expressed as follows:
>CH2 + 4CoF3--->CF2 + 4CoF2 + 2HF (at 110 - 400 C)
followed, in a separate stage, by
2CoF2 + F2 ---> 2CoF3 (250 - 400C)"1.
It is not economical because so much fluorine ends up as HF and there are a
whole pile of side reactions, which increase in number as you try to make
longer and longer chains (No surprise there.)
There may be newer, better ways, but you can bet there are still lots of
nasty things to have to deal with. So unless the manufacturer wants to have
a lot of dissolved workers, everything is going to be done in high quality
nickel or Monel metal, with valves that costs thousands of dollars a piece.
1. One of my favourite references, an oldy but a goody (shows what happens
to a hand put in conc. HF - good safety reminder) A.J. Rudge, The
Manufacture and Use of Fluorine and Its Compounds, Oxford University Press,
London, 1962.
regards,
Bev Christian
Research in Motion
-----Original Message-----
From: Jim Kittel [mailto:[log in to unmask]]
Sent: February 19, 2002 9:37 AM
To: [log in to unmask]
Subject: Re: [TN] Antw: [TN] Vapor Phase Soldering ReVisited!
That would certainly make VP more palatable. If not due to VOC taxes, why
are the fluids so expensive?
Jim Kittel
-----Original Message-----
From: James TerVeen [mailto:[log in to unmask]]
Sent: Tuesday, February 19, 2002 6:08 AM
To: [log in to unmask]
Subject: Re: [TN] Antw: [TN] Vapor Phase Soldering ReVisited!
I do not think these are ozone depleter but they are very costly.
This is the statement that they give regarding there material
in the data you are talking about.
Hence, Fomblin and Galden perfluoropolyether fluids have a ZERO
Ozone Depletion Potential and are not classified as VOCs by the
EPA.
Brian Ellis
<b_ellis@PROTO To: [log in to unmask]
NIQUE.COM> cc:
Sent by: Subject: Re: [TN] Antw: [TN]
Vapor Phase
TechNet Soldering ReVisited!
<[log in to unmask]
RG>
02/16/02 03:01
AM
Please respond
to "TechNet
E-Mail
Forum.";
Please respond
to Brian Ellis
Guenter
See http://www.ausimont.com/docs/gald_vapor.html
This gives you details of fluids with BPs of 155, 166, 200, 210, 215,
230, 240 and 260 °C. Surely you can find one to suit almost any
application in that range.
However, I repeat my earlier warning that these products are horrific
global warmers and are not exactly given away with a packet of corn
flakes.
Best regards,
Brian
Guenter Grossmann wrote:
>
> Jim
>
> I believe the VP is still a good principle. However, the industrial
partner in LEADFREE that runs the VP trials told me that he has to use a
liquid with a boiling point of 270 deg.C and that there is nothing
available that boils around 230 deg.
> I had problem to believe this but also after asking again I got the same
answer.
>
> Best regards
>
> Guenter
>
> .
>
> EMPA
> Swiss Federal Institute for Materials Testing and Research
> Centre for Reliability
> Dipl. Eng. Guenter Grossmann
>
> 8600 Duebendorf
> Switzerland
>
> Phone: xx41 1 823 4279
> Fax : xx41 1823 4054
> mail: [log in to unmask]
>
>
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