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Bioburden with BIO PLUS EEF Filters

 

Testing 
Performance results presented here are based on laboratory filtration and microbiological tests using Escherichia coli and Staphylococcus epidermidis. These tests were conducted at the University of Wisconsin and at Virginia Polytechnic Institute and State University. Field tests reported here were conducted at Encelle Corp. N.C. and were conducted by Encelle personal. Click here to select technical papers to download.

 

Bactericidal Effects Conventional filters can often become a breeding ground for bacteria. Biocides on filters are only effective as long as the filters are clean. Bacteria can grow through conventional filters and start shedding into the room. The BIO PLUS filter system, however, continuously kills the bacteria caught on the filters by means of ion bombardment, as demonstrated by the tests summarized in Table I:

Table I: EEF Bactericidal Test Summary using S. epidermidis- after 4 hours of air flow
[CONTROL= CONVENTIONAL HEPA FILTER]

AVERAGE COLONIES

Filter #/sq. inch of filter % KILLED/ COMMENT
Control 1.00E+06

No Additional Growth
After 24 Hours

Control 1.02E+05
EEF 0.00E+00 100% KILLED
EEF 3.44E+02 99.93% KILLED
EEF 0.00E+00 100% KILLED
EEF 0.00E+00

Some Growth
After 48 Hours

EEF 0.00E+00
EEF 6.26E+03 98.75% KILLED
EEF 5.44E+02 99.9% KILLED
EEF 2.16E+02 99.95% KILLED
EEF 3.51E+03 99.3% KILLED
 

Summary of Some Field Tests:
Airborne Bioburden in the Encelle Class 1,000 cleanroom

Design
Class 1,000

11/14/99 11/30/99 12/13/99 1/28/00

Cfu/ft3/
24hr.*

Cfu/ft3/
72hr*

Cfu/ft3/
24hr.*

Cfu/ft3/
72hr*

Cfu/ft3/
24hr.*

Cfu/ft3/
72hr*

Cfu/ft3/
24hr.*

Cfu/ft3/
72hr*

Device Testing 

0.849

0.878 0 0 0 0 0 0
Coating 0 0.142 0.057 0.057 0 0 0 0
Formulations 0.538 0.566 0 0 0 0 0 0
Device 0.283 0.340 0.113 0.113 0 0 0 0
Manufacturing Refrigeration 0 0 0 0 0 0 0 0
Isolation 0.113 0.170 0.849 0.849 0 0 0 0

The Class 1,000 room has lower bioburden than a class 100 room!

Click here to select technical papers to download.

 
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Copyright 2002, 2010 Technovation Systems Inc
Last modified: February 05, 2010