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 >> >> >> >> --------------------------------------------------- >> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >> To unsubscribe, send a message to [log in to unmask] with following text in >> the BODY (NOT the subject field): SIGNOFF Technet >> To temporarily halt or (re-start) delivery of Technet send e-mail to >> [log in to unmask]: SET Technet NOMAIL or (MAIL) >> To receive ONE mailing per day of all the posts: send e-mail to >> [log in to unmask]: SET Technet Digest >> Search the archives of previous posts at: >> http://listserv.ipc.org/archives >> Please visit IPC web site >> http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional >> information, or contact Keach Sasamori at [log in to unmask] or >> 847-615-7100 ext.2815 >> ----------------------------------------------------- >> > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site > http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 > ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------