Thanks for the plug!

Brian

Inge wrote:
> I have your book. Great stuff. I like the odd language with very 
> personal expressions and humoristic formulations. Indeed a personal 
> work, good entertainment besides the massive content of facts. I 
> recommend the book. Every process engineer ought to have it on the desk. 
> If you can get it.....
> Inge
> 
> 
> ----- Original Message ----- From: "Brian Ellis" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 21, 2009 8:17 AM
> Subject: Re: [TN] Contamination by Hand Sanitizers & Lotions
> 
> 
>> Apart from the thread on this subject here a month or two back, the 
>> only mention in literature that I know of is in my book, which 
>> discusses in a diagrammatic form not only the effect of lotions before 
>> and after soldering. Sanitisers didn't exist in those days, but their 
>> effect is similar to lotions, although their oily components are lower.
>>
>> As an addendum to my post in the earlier thread, I was back in 
>> hospital for another operation last week and found that they had 
>> placed squirt-bottles of sanitisers every 5 m along all the corridors, 
>> presumably as an anti-H1N1 measure. This allowed me to have better 
>> access to the stuff and I found that the hand was persistently 
>> contaminated. I was able to repeat my mirror test 2 or 3 hours after 
>> deliberately using the sanitiser correctly, being careful not to 
>> handle anything in the meanwhile. As one of the components is a high 
>> molecular weight polymerised glycol, it is a reasonable assumption 
>> that this is the persistent substance. As it is hygroscopic, it is 
>> also a reasonable assumption that it's not going to improve sensitive 
>> electronics if transferred from the hand to an assembly. If such 
>> transfer occurs before soldering, then the heat may cause further 
>> polymerisation, rendering the hygroscopic residues more difficult, 
>> maybe impossible, to remove.
>>
>> Brian
>>
>> Diljit Matharu wrote:
>>> Can someone direct me to resources which talk about PCBAs 
>>> contamination by the use of hand sanitizers & lotions.
>>>
>>>
>>>
>>> Thanks,
>>>
>>>
>>>
>>> Diljit S. Matharu
>>> Quality Leader - B C
>>> Creation Technologies
>>>
>>> Office: 604.430.4336 x 3395 | Mobile: 778.240.8144
>>> 8977 Fraserton Court | Burnaby, BC, Canada | V5J 5G1
>>> [log in to unmask]<mailto:[log in to unmask]> 
>>> | www.creationtech.com<http://www.creationtech.com/>
>>>
>>> [cid:[log in to unmask]]Working together to build the future
>>>
>>>
>>>
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