CSC Scientific Blog

The Need for Mid-Point Sieves

ASTM and ISO establish standards for the acceptable range of openings in a wire mesh sieve. For larger mesh sizes, the variation between the largest and smallest acceptable openings has little impact on sieve performance. However, as mesh sizes decrease, the potential for performance differences between sieves becomes significant. These discrepancies, especially when an old sieve is replaced in a master stack, can lead to problematic QC data. Mid-Point sieves can help alleviate this issue.

What is a Mid-Point Sieve?

A mid-point sieve has had the mesh inspected after mounting. The sieve is then selected as a mid-point if the results give tolerances that are in the middle of the ASTM standard. 

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Topics: Sieve Certification, Sieving Process, Sieve Analysis, Sieve Quality

Yes Harry, there is a Santa Claus. Or, more specifically, there really is a Holy Grail for ensuring consistent particle size analysis. 

If you’ve been following along, you know it was proven by Pequeño and his family of 150 micron particles who tried to bust our friend Harry’s quality control by attempting to slip through the mesh in Harry’s test sieves and defeat sieve certification.

If you missed this drama, check out previous posts in the Holy Grail series here:

Is there a Holy Grail of Sieve Analysis?

Will Certification Lead to the Holy Grail of Sieving?

Does Calibration Light the Way to the Sieving Holy Grail?

Sieve Calibration is the Holy Grail!

And finally check out our eBook here: Free eBook

Now that we have indeed confirmed that, yes, sieve calibration really is the Holy Grail that sieve testers have been looking for, let’s get to work and dive a little deeper. Let’s examine some methods of sieve calibration.

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Topics: Pequeño, Calibration, Particle Size Analysis, Sieve Calibration, Sieve Certification, Sieve Testing, Sieves, Sieving Process, du Nouy tensiometer, sieve mesh, particle sieze testing, sieve stack, Sieve Quality

You may remember Pequeño and his family of very small 150 micron (150µ) particles being very determined to defeat sieve certification.

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Topics: Calibration, Particle Size Analysis, Sieve Calibration, Sieve Certification, Sieve Testing, Sieves, Sieving Process, Sieve Analysis, Sieve Quality