Old Test Standard: ISO4572

New Test Standard: ISO16889

Particle Counter

 According to ISO4402 According to ISO11171

Test Dust

 AC Fine Test Dust ISO Medium Test Dust

Dust Particle Diameter Measurement

 Measurement of maximum length (inconsistent shapes) Measurement of projected circular diameter

Particle Diameter

 Expressed as X mu micron Expressed as mu micron (c) *

Test Dust Concentration (mg/L)

 10 Choice among 3,10, or 15

Beta Ratio (Beta)

 Beta x Beta X(c)

Data Sheet Format

 Specified Specified

Graph Format

 Not specified Specified
*(c)mark indicates gcertifiedh ,                                                  NIST certifies traceability

 

It is important to be aware of some details associated with these changes in multipass testing methods.

Specifically, even if identical filter elements are tested using both the old and new test standards, the test results will indicate different efficiencies (beta ratio, filter life etc.). 

Therefore, it is important to keep in mind that even though no changes have been made to any given filter, the beta ratio and life will be different when comparing data obtained from the old and new testing methods. Another disadvantage is that, unfortunately, there is no rule or calculation available to convert old test data (Beta x under ISO4572) into new test data (Beta x (c) under ISO16889) in order to compare these two sets of data.
 
 
Compared to test data associated with the old standard (ISO4572) which consisted of two types of information, [Element Differential Pressure vs. Time] & [Beta ratio vs. Time]; the new test standard (ISO16889) provides the following 4 types of information:

[Element Differential Pressure vs. Contaminant Added]

[Filtration Ratio vs. Particle Size]

[Filtration Ratio vs. Percent Test Time]

[Plot of Filtration Ratio vs. Element Differential Pressure]

 
 
Due to the differences between the old test standard (ISO4572) and the new test standard (ISO16889), we can find large disparities in beta ratio results, even when testing the same exact filter element. 

This variation in efficiency ratings for the same filter can be misleading. For example, if we examine the above data obtained by testing a filter element using the new test standard (ISO16889) and we compare these results to the exact same filter element tested using the old test standard (ISO4572), we find

 
 
 

Yamashin will be adopting this new multipass test standard (ISO16889) in order to remain current on international testing standards. 

However, to assist our customerfs in understanding this new data during this transition period, Yamashin is pleased to provide old standard (ISO4572) test results along with the new multipass test standard results(ISO16889), upon customer request.

Yamashin Filter Manufacturing Corporation

Phone:81-45-311-1091 Fax:81-45-311-2097