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August 2009

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From:
Douglas Pauls <[log in to unmask]>
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Date:
Fri, 21 Aug 2009 13:18:03 -0500
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Well, I can briefly discussed what we have done so far.  These are the 
materials we have been looking at:

Purell hand sanitizer
Sams Club hand sanitizer
Germ-X Gnarley Green hand sanitizer (just because I want to use Gnarley in 
a technical report)
Jergen's Hand Lotion
Bath and Body Works Midnight Pomegranite (funny background story as to 
why)
Techspray's lotion (our current approved standard)

We have done a chemical analysis on the materials. 
Did an ionic transfer study using ceramic plates.  Nothing much transfers 
on the sanitizers, and no measurable ionics on lotions.
Did some SIR work - still have to analyze the data but at first glance 
nothing leaps out at me
Presently (today) doing solderability impacts
Dielectric Withstanding Voltage tests pending
Effects on adhesive bonding pending

Based on what I have seen so far, I don't really have too much of a 
concern on the hand sanitizers.  The vast majority evaporates, not much, 
if any gets transferred to the assembly, and we clean in house anyway 
prior to conformal coating.  The jury is still out on the hand lotions. If 
you are a no-clean house, you might have more of a concern than I have.

Chemically, if you forced me to pick one, go with the Purell.  The Sams 
Club stuff is cheaper, but has some noticable residues and the Purell 
seems cleaner. 

Remember, free advice is worth everything you pay for it, but I think you 
are OK if they are allowed in house.  Last summer, when Cedar Rapids went 
through its major flooding, we were asked to curtail water usage as much 
as possible to save the one remaining city well that had not flooded.  We 
used primarily hand sanitizers for 3-4 weeks rather than soap and water 
and we had no incidences during that time of contamination we could trace 
to these materials.

Doug Pauls



Roger Mack <[log in to unmask]> 
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08/21/2009 11:20 AM
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Re: [TN] Contamination by Hand Sanitizers & Lotions






If there is any chance of getting results sooner I would be interested. 
Based on the earlier technet conversations we have not been supplying 
operators with sanitizers and encouraging hand washing. However, just like 

ESD lotion, whether you supply the floor or not, you have to be on the 
watch for unapproved materials from home being used.

Just this week the request for sanitizers has come up again with back to 
school and flue season only 2 weeks away. The recent flues going around do 

cause some panic and it would be great to have some data to back up any 
position we take on sanitizer use.


Roger Mack  P.Eng. 
Manufacturing Specialist
Parker Hannifin Corporation
Electronic Controls Division
1305 Clarence Avenue
Winnipeg, MB  R3T 1T4 Canada 
direct 204 453 3339 x373
www.vansco.ca
www.parker.com







Douglas Pauls <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
2009-08-21 10:45
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Re: [TN] Contamination by Hand Sanitizers & Lotions






Good morning all,

Being blessed with an abundance of bright young co-op students, we are 
doing a study of the topic here at Rockwell Collins.  The study will 
finish in a few weeks and I plan on publishing the results, probably at 
Apex.

Doug Pauls
Rockwell Collins



Brian Ellis <[log in to unmask]> 
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08/21/2009 01:17 AM
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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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