I'd have said he's avionics related as he does spend a fair amount of
time jetting about.
regards,
Graham Collins
Process Engineer,
Northrop Grumman Canada Corporation
Halifax
(902) 873-2000 ext 6215
>>> [log in to unmask] 12/01/04 09:56AM >>>
Not so. Graham is hi-rel and so exempt from the EU legislation.
Doug Pauls
"Whittaker, Dewey
(AZ75)"
<Dewey.Whittaker@
To
HONEYWELL.COM> [log in to unmask]
Sent by: TechNet
cc
<[log in to unmask]>
Subject
Re: [TN] VOCs
12/01/2004 07:47
AM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
"Whittaker, Dewey
(AZ75)"
<Dewey.Whittaker@
HONEYWELL.COM>
After reading the first paragraph, a few of us who know Graham are
concerned
he could be banned from the EU after July 2006.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Wednesday, December 01, 2004 5:37 AM
To: [log in to unmask]
Subject: Re: [TN] VOCs
It also includes your breath after having partaken ¼ of a unit of any
alcoholic beverage, includin beer and wine.
As usual, the EU has, by its definition, demonstrated its habitual
scientific ineptitude. It takes no notice whatsoever of the effect a
VOC
has on the environment. Not all VOCs photoreact with NOxs in the same
way. The directive that Graham quotes applies particularly to
solvents.
Some alkane or alkene solvents, as well as most cyclic ones, react
severely, where others have hardly any effect. For example, "white
spirit" and terpenes are bad but perchloroethylene has almost no
effect,
but the permitted stack concentrations are identical for all of them.
Plumb crazy, again.
The US regulations and exemptions on VOCs depend largely on which
lobby
can cry the loudest, especially in CA.
On neither side of the Atlantic is the legislation based on sound
science. (Where have I heard that before?)
Brian
Graham Naisbitt wrote:
> David
>
> Fluxes are used for essentially 2 purposes: one to remove surface
oxides
and
> to facilitate good wetting and second as a heat transfer medium.
>
> You then ask: "do they burn off...during the soldering process" - to
quote
> my good friend Doug Pauls: "It depends".
>
> It depends on the type of flux being used. If it is a no-clean flux,
then
it
> is the flux manufacturers intention that the res
idues - and ALL
fluxes
leave
> residues - shall be volatilised off the surface by the correct amount
of
> heat relative to residue volume. Of course, if you have areas (i.e.
topside
> in wave soldering) that do not see the correct temperature for the
desired
> time, then they will remain behind and might cause you some
reliability
> issues when in the field.
>
> Some other rosin based, dare I say classic, fluxes, are sometimes
designed
> to be left on the surface, or at least may be left behind in the
knowledge
> and comfort (well, on a wing and a prayer sometimes!) that they will
be
> cleaned off afterwards.
>
> VOC's:
>
> As defined by ³Council Directive 1999/13/EC of 11th March 1999:
> 17. volatile organic compound (VOC) shall mean any organic compound
having
> at 293.15 K a vapour pressure of 0.01kPa or more, or having a
corresponding
> volatility under the particular conditions of use
>
> As defined by ³Council Directive 1999/13/EC of 11th March 1999:
> Organic compound shall mean any compound containing Carbon and at
least
one
> or more of hydrogen, halogens, oxygen, sulphur, phosphorous silicon
or
> nitrogen
>
> As defined by ³Council Directive 1999/13/EC of 11th March 1999:
> 9. *emission shall mean any discharge of volatile organic compounds
from
an
> installation into the environment. *into air, soil and water as well
as
> solvents contained in any products. They include uncaptured
emissions
> released to the outside environment via windows, doors, vents and
similar
> openings.
>
> VOC Controls:
> USA = Tax on solvents BUT Tax-Free solvents on EPA list
> EU = Anything with a vapour pressure that is >0.01kPa @293.15K
> This includes Whisky, Gin, Brandy, Vodka*but not beer and wine!
>
> I hope this helps
>
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