Very interesting... thanks
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Russeau
Sent: Monday, April 27, 2009 1:49 PM
To: [log in to unmask]
Subject: Re: [TN] Hand Sanitizer and PCB Assembly
Well to add some additional information to this subject matter. In college
I took a majors level microbiology class. This was about the time that all
of these hand sanitizers were becoming popular. In one experiment, our goal
was to determine the effectiveness of these sanitizers to kill the various
microorganisms indigenous to humans. Everyone started with a baseline of
their uncleaned hands to establish each individual's flora. We all have
different bugs on our skin, sort of like fingerprints if you will.. We used
a wide variety of growing media from different agar plates to broths to grow
all the various bugs. Then we washed hands for different times using the
various hand sanitizers. We re-plated after each cleaning period and each
sanitizer. Also, this was not done all at once, but over several lab
periods. Surprisingly, the results showed that a quick wash (less than one
minute) with these materials was ineffective in reducing the various germs.
Washing hands longer than five minutes was required to have any significant
effect.
The sanitizers used today may be somewhat better than nothing, but my
concern is that the more these are used, the less resistant some of these
bugs will become. Keep in mind that not all bugs are harmed by short
exposures to these materials, as they have very good defense mechanisms. So
if their not killed with short exposures, that helps them gain resistance as
their DNA evolves very quickly. In addition, as humans, we may be doing
ourselves a disservice by lowering our own natural resistance and defense to
these critters. My microbiology professor said he believed that the next
dominant species on Earth would be microorganisms because of our practices
with the various sanitary cleaners and antibiotic drugs.
Joe Russeau
----- Original Message -----
From: "Ken Bloomquist" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 27, 2009 11:14 AM
Subject: Re: [TN] Hand Sanitizer and PCB Assembly
> Hi Karen,
>
> You wrote: "I've always found hand sanitizer superfluous, just washing
> ones
> hands with soap and water kills most germs."
>
> I agree that in the work environment you are probably correct but I think
> that hand sanitizers with at least 60% alcohol are good when you are out
> in
> public and can't readily wash your hands. I usually keep a small bottle in
> my car and an even smaller one in my pocket.
>
> KennyB
> -----Original Message-----
> From: Karen Tellefsen [mailto:[log in to unmask]]
> Sent: Monday, April 27, 2009 6:43 AM
> To: [log in to unmask]
> Subject: Re: [TN] Hand Sanitizer and PCB Assembly
>
> Purell:
>
> Ingredients:
> Active Ingredients: Contains: Ethyl Alcohol (62%)
>
> Inactive Ingredients: Water, Glycerin, Isopropyl Myristate, Propylene
> Glycol, Tocopheryl Acetate, Aminomethyl Propanol, Carbomer, Fragrance
> (parfum)
>
>
> The glycerin and propylene glycol would concern me, they're both
> hydrophillic. The ethanol in the active ingredient, maybe a mixture of
> 60% ethanol 35% water 5% isopropanol ( to make it undrinkable, but safe
> enough for topical use) would be better around circuit boards. It would
> tend to dry the users' hands, but would not help to contaminate circuit
> boards.
>
> I've always found hand sanitizer superfluous, just washing ones hands with
> soap and water kills most germs.
>
>
> Karen Tellefsen - Electrical Testing
> [log in to unmask]
> 908-791-3069
>
>
>
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