CSC Scientific Blog

As followers of these rants know, we manufacture and distribute tensiometers. As a tensiometer manufacturer, we are often asked, “if I am going to replace my tensiometer, which one should I get?”

Let's explore the alternatives and compare their respective capabilities.

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Topics: Wilhelmy Plates, Automatic Digital Tensiometer, duNouy Rings, Tensiometer, Surface Tension Measurement, Surface Tension, Fisher Tensiomat, Tensiomat Trade-In, Liquid Properties, Digital tensiometer, automatic Tensiometer

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