Have you any evidence that 40% will do the trick.....?

Graham ;-)

On 11 Aug 2011, at 16:28, Rex Waygood wrote:

> 40% sounds about right!
> :-)
> Rex 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
> Sent: 11 August 2011 16:21
> To: [log in to unmask]
> Subject: Re: [TN] Lead Free solder has performed well...
> 
> Hello Techies everywhere,
> 
> You might be interested to know that our Japanese cousins are presently
> lobbying the EU and others, to permit the use of a small amount of lead
> in soldering alloys. They are doing this because of certain concerns
> over product reliability.
> 
> Regards
> 
> Graham Naisbitt - KBO
> 
> Email: [log in to unmask]
> Phone: +44 (0)12 5252 1500
> Web: www.gen3systems.com
> 
> On 11 Aug 2011, at 14:47, Stadem, Richard D. wrote:
> 
>> A post for the Technet Hall of Fame! Great job, Rex. One big whompin'
> ATTABOY. Set 'em straight.
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
>> Sent: Thursday, August 11, 2011 2:08 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Lead Free solder has performed well...
>> 
>> 
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ron Lasky
>> Sent: 10 August 2011 16:03
>> To: [log in to unmask]
>> Subject: Re: [TN] Lead Free solder has performed well...
>> 
>> Folks,
>> 
>> I thought I posted this:
>> 
>> Rex: You did
>> 
>> Since there has been much discussion about what it has been assumed 
>> that I said about lead-free solder,  it would seem to be reasonable to
> 
>> share my actual thoughts on the status of lead-free.  So here are some
> 
>> of them.
>> Lead-free is here.  It is not going away.  
>> 
>> Rex: Unfortunately true. That doesn't make the original decision 
>> correct.
>> 
>> So let's understand how it affects us.  I don't have a problem with 
>> discussing lead-free's short comings, but spending a great deal of 
>> time acting like it will be repealed if we complain enough is a waste 
>> of time.
>> 
>> Rex: Agreed but you did post twice.
>> 
>> Let's discuss reliability, process challenges, concerns over silver 
>> and tin costs and supply, electrical use, etc.  But let the 
>> discussions be based on data and analysis, not emotions.
>> 
>> I agree that lead-free solder was and is not now needed to protect the
> 
>> environment or the citizens of the European Union.  It has never been 
>> demonstrated that lead containing solders are a threat in land-fills 
>> and it has been demonstrated that leaded solders can be safely 
>> recycled. In addition, establishing lead-free assembly cost upwards of
> 
>> $50B and continues to present challenges and require investment.
>> 
>> Rex: I must of missed something here I thought that was the reason we 
>> were all forced to introduce this process. My recollection was that 
>> was exactly the justification used.
>> 
>> Although lead-free was not needed to protect consumers or the 
>> environment in the EU, since a large proportion of re-cycling is 
>> performed "illegally" in 3rd world countries, it is likely safer for 
>> the untrained and unregulated re-cylers of the 3rd world to recycle 
>> lead-free solders than leaded solders.
>> 
>> Rex: Unfortunately lead free doesn't tackle this problem for many 
>> years as the millions of tons of legacy WEEE will still be ending up 
>> where it can do its environmental and human damage. Also the illegal 
>> WEEE route doesn't just put lead into the environment and poison 
>> humans there are many other by-products of this process. Where is the 
>> evidence that tin is good for the environment? What could have been 
>> done with all that human effort if the illegal WEEE trade had been 
>> tackled? It still isn't being tackled and we are still poisoning 
>> people with things as well as lead. A UK recycling facility runs at 
>> half capacity because it is too easy to ship containers of WEEE as 2nd
> 
>> user goods (it isn't) to 3rd world countries and the chances of
> getting caught are too low.
>> 
>> Reliability of lead-free assembled commercial type products has been 
>> demonstrated in the lab and in the field.
>> 
>> Rex: So what. Was this legislation necessary? Tin lead had 50 years 
>> plus of reliability data.
>> 
>> I am referring to 0 to 100C type thermal cycling and drop shock 
>> testing, with SAC alloys.  The experimental data of Henshall and Coyle
> 
>> presented last year at SMTAI support this.  Their work represents 
>> millions of dollars of testing by teams of major companies. Although 
>> RoHS is only 5 years old, Motorola has about 10 years of field data.  
>> They claim equal or better reliability with lead-free.  Add this to 
>> the trillions of dollars of products manufactured since RoHS was 
>> enacted, with no major reliability problems and it would be hard to 
>> argue that commercial product reliability has not been demonstrated.
>> 
>> Rex: This is still retrospective justification for a poor decision. 
>> The point is we didn't need to do the change.
>> 
>> But, I agree, harsh environment, mission critical, long-life 
>> reliability of lead-free solder has not been demonstrated.
>> 
>> Rex: Any reduction of the life of products is likely to increase the 
>> flow of WEEE into the illegal processing trade and will not make the 
>> situation better. At one point the average life of a phone in the UK 
>> was about a year!
>> 
>> It would be hard to over state the benefit of lead-free solder's 
>> poorer spreading enabling high performance mobile products.
>> 
>> Rex: I don't believe it was necessary to burden the whole of the 
>> world's electronics manufacturing system to solve the problem of 
>> producing phones. If the CEMs making phones where unable to solve 
>> their process problems without invoking lead free then they were free 
>> to do so. This isn't actually something I believe anyway. Although our
> 
>> experience is small in comparison to phone manufacturers we have made 
>> thousands of boards using telephone technology parts using lead 
>> processes for the US telecoms market. It wasn't easy but the process 
>> problems were solved. We didn't say to the US customer you have to
> take lead free.
>> 
>> There are now 5.6 billion mobile phone subscriptions in a world of 7 
>> billion people.  No electronic product has made such a market 
>> penetration.  Lead-free solder has aided this feat in enabling 
>> tremendous function in a small size.
>> 
>> Rex: Please provide proof that there were no other solutions to a 
>> processing problem and that to achieve this we had to force the whole 
>> world to change the manufacturing process.
>> 
>> Ron
>> 
>> Rex: Your post to me is like that provided by a politician who makes a
> 
>> very bad decision and then tries to justify it retrospectively with a 
>> complete red herring.
>> 
>> 
>> Regards
>> Rex
>> 
>> 
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