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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Tue, 28 Apr 2009 09:41:56 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (210 lines)
I found this:

The Center for Disease Control and Prevention (CDC) and World Health
Organization (WHO) recommends healthcare workers using an alcohol-based
hand sanitizer to disinfect hands. Using 60-95% alcohol (by weight) rub or
gel has the highest efficacy rate in killing a broad range of
microorganisms.

So hand sanitizers have their place.  People have been sanitizing for
millennia with soap, i.e. potassium and sodium salts of fatty acids,
without soap becoming less effective at removing germs, Additionally,
ethanol has been used for sanitizing for well over a century without losing
its basic effectiveness.

However, my mother washed my baby brother every day with Phisohex when he
was an infant, when it would have been much better to use a mild,
super-fatted soap.  She did this because she had an exaggerated fear of
germs.  This did not prevent him from pulling a piece of chewing gum out of
the sandbox in a public park, which resulted in the whole family having
dysentery.

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



                                                                           
             Brian Ellis                                                   
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                                                                   Subject 
             04/28/2009 01:22          Re: [TN] Hand Sanitizer and PCB     
             AM                        Assembly                            
                                                                           
                                                                           
             Please respond to                                             
              TechNet E-Mail                                               
                   Forum                                                   
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             ; Please respond                                              
                    to                                                     
                Brian Ellis                                                
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                    OM>                                                    
                                                                           
                                                                           




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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