Hi Brian,

The results were surprising in that the antibacterial soaps were marketed as 
killing 99% of germs on contact, which is what we expected to see in the 
results of short cleaning durations compared to the baseline results. None 
of us expected five minutes of exposure to be required. The goal of that 
experiment was to determine if the claim that 99% of germs would be killed 
on contact was accurate.  Keep in mind, these antibacterial soaps were very 
new products at that time.  Needless-to-say, the marketing claims were 
false.

You are correct about the hot water, which we also used in those 
experiments.

Joe Russeau



----- Original Message ----- 
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 28, 2009 1:19 AM
Subject: Re: [TN] Hand Sanitizer and PCB Assembly


> Not surprising! And it has to be hot to ensure pores are opened. Surgeons 
> have known empirically for >100 years that scrubbing takes 10 minutes.
>
> Brian
>
> Joe Russeau wrote:
>> 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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