How does the VPS emitted molecules behave? Do they mix and spread or do they keep together like clouds? And what are their mass compared to air? To reach the stratosphere, they need be a bit lighter than oxygen. And what time does it take for these molecules to reach the altitude where they build a layer of their own? Do they pass the ozone layer or stay below? And how do we know about the time it takes to get rid of them? Do we calculate only or is this process measured in real tests? And how do we know the emissions are not decomposited to something else (caused by ionic irradiation, UV, gamma etc)?
Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: onsdag 28 januari 2009 15:35
To: [log in to unmask]
Subject: Re: [TN] Vapor Phase Soldering

Werner

And when the Brussels greens (sprouts?) decide to restrict perfluorocarbons? I think this may happen sooner or later. It would be almost impossible to devise a VPS machine with zero emissions and a practicable throughput. Depending on the components used, it can take days for an assembly to lower its emissions to undetectable levels after soldering.

Brian

Werner engelmaier wrote:
>  Hi Brian,
> I fully agree with you--on both counts.
> Unfortunately, you need to lay the blame for the need for VPS squarely at the feet at the misguided 'greens' in Brussel.
> 
> Werner
> 
> 
>  
> 
> 
>  
> 
> -----Original Message-----
> From: Brian Ellis <[log in to unmask]>
> To: TechNet E-Mail Forum <[log in to unmask]>; Werner engelmaier 
> <[log in to unmask]>
> Sent: Wed, 28 Jan 2009 5:56 am
> Subject: Re: [TN] Vapor Phase Soldering
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yes, some do, at least as far as the practical aspects of soldering 
> are concerned. However, very few even  cast a thought to the 
> environmental aspects, which are horrendous. The radiative forcing due 
> to halocarbons, mostly fluorinated) has increased from near-zero to an 
> average of 0.34 W/m² in the last 50 years; this is about 21% of the 
> total net anthropogenic climate change effect (IPCC 2007 Fig SPM2). 
> The perfluorinated compounds used in VPS are the most pernicious of 
> these because their long atmospheric residence time (>10,000 years) 
> make them continue to have their effect over many tens of generations 
> to come. Â
> 
> As an engineer, VPS is the best thing since sliced bread. As an 
> environmentalist, it is the worst thing since Noah was told to build 
> his ark. Â
> 
> BrianÂ
> Â
> 
> Werner engelmaier wrote:Â
> 
>>  
>>
>>
>>  
>>
>> Hi,
>> Does any one know of an assembly house that has vapor phase 
>> capability and knows what they are doing?Â
> 
>> WernerÂ
> 
>>
>>
>> ----------------------------------------------
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>  
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