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Appendix




               Changes to ISO Standards and their impact on Filter Performance
               Reporting and the Contamination Code, continued.



               ISO 16889 is the new multi-pass test standard for
               measuring fi lter performance and utilizes ISO MTD
               as the contaminant challenge.  This standard is
               replacing ISO 4572 which utilized ACFTD.  See
               the following graphs below for fi ltration beta ratio
               comparisons on our 2Q, 5Q, 10Q, and 20Q
               Microglass III media.  The graphs refl ect
               multi-pass test results using ISO 4572 with ACFTD
               and the revised ISO 16889 using ISO MTD.






                                 FILTRATION RATIOS FOR 2Q MEDIA                      FILTRATION RATIOS FOR 10Q MEDIA
                                                                        10000
                     10000
                                   ISO 4572
                                   ISO 4572                              1000
                  FILTRATION RATIO  (BETA)  200      ISO 16889        FILTRATION RATIO  (BETA)  200  ISO 4572  ISO 16889
                     1000
                                                     ISO 16889
                                                                                                         ISO 16889
                                                                         100
                     100
                                                                                    ISO 4572
                                                                          10
                      10
                       1
                                                                          1
                        0    1           3    4     5     6    7
                                   2
                                                                           0    2    4    6    8    10   12   14   16
                                                                                         PARTICLE SIZE um or um(c)
                                  FILTRATION RATIOS FOR 5Q MEDIA                     FILTRATION RATIOS FOR 20Q MEDIA
                     10000
                                                                        10000
                  FILTRATION RATIO  (BETA)  200    ISO 16889          FILTRATION RATIO  (BETA)  1000  ISO 16889  ISO 4572
                                        ISO 4572
                                        ISO 4572
                                                                                            ISO 16889
                     1000
                                                   ISO 16889
                                                                         200
                                                                                                      ISO 4572
                      100
                                                                         100
                      10
                                                                          10
                                                                          1
                       1
                        0  1   2   3   4   5   6   7   8   9   10          0      5     10     15    20     25     30
                                     PARTICLE SIZE um or um(c)                          PARTICLE SIZE um or um(c)












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