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Standards Development
This document specifies the method of test for the mechanical resistance and strength of components of respiratory protective devices
The reason for this ballot is it is believed the tolerance figures shown in figure 10 are an error introduced during the revision when they shouldn’t have been
From a practical standpoint, the force of impact of a sample exposed to the mechanical stress test depends on gravitational acceleration, which varies around the Earth depending on latitude and altitude. Due to that variability, the force of impact on the sample in the mechanical stress test can vary by more than 0.5%, depending on the test location. The tolerance shown in Figure 10 of 16900-6:2021 (20 ± 0.1 mm) is a range of 0.5% (100 x 0.1/20), which would have the same effect as an 0.5% change in gravitational acceleration. If we are concerned about an 0.5% change in the force of impact in the mechanical stress tester then we should also be concerned about local differences in gravitational acceleration. That would be quite impractical. Similarly, a specification that requires we control the drop height of the mechanical tester to such a tight specification is also impractical
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