surgical masks

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On Oct 25 2005 10:10AM  jp.nolan wrote: 

Hi all,

Can anyone direct me to a study/paper on the lenght of time for which surgical face masks retain their filtration effectiveness.

Many thanks,
JP Nolan.

On Oct 25 2005 11:26AM  nsmall wrote: 
We lab tests on file conducted by Nelson Laboratories where the least expensive of K-C Tecnol products remain efficient for at least 3 hours and up to 8 hours on others.

Please get in touch if any of you would like to see copies of the test data.

Nigel

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