CSC Scientific Blog

A blog about test equipment

CSC Scientific Blog

Who's Concerned About Sieve Shakers?

Posted by Art Gatenby on Mar 11, 2011 12:33:00 PM


The primary purpose of a sieve shaker is to provide motion to a sample in a test sieve.

An effective sieve shaker creates a motion that presents all the particles to all of the sieve openings and assists particles in passing through. This requires both rotary and vertical motion.

This process seems simple enough, but let's not be taken in.

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Topics: Sieve Shakers, Particle Size Analysis, Sieve Testing, Sieves

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries Part III: Free and Bound Water

Posted by Art Gatenby on Jan 25, 2011 4:18:00 PM

In my previous missive about Loss-On drying, we discussed Vapor Pressure -- because logically it was next. As we continue to explore moisture, we learn how vital vapor pressure is when regarding the quirky issues of free and bound water.

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Topics: Evaporation, Bound Moisture, Free Moisture, Moisture Analysis, Moisture Testing, Loss-On-Drying, Moisture

How Does Surface Tension Relate to Viscosity?

Posted by Art Gatenby on Jan 17, 2011 9:58:00 PM

You may recall that I promised to offer my interpretation as to how Surface Tension is related to Viscosity.

To begin with, liquid surface tension and viscosity share a common trait: they both involve properties of fluids. After that, things start to get murky.

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Topics: Wilhelmy Plates, Viscosity, duNouy Rings, Tensiometer, Surface Tension Measurement, Surface Tension, Interfacial Tensiometer

Loss On Drying Moisture Analysis and Other Moisture Mysteries II Vapor Pressure

Posted by Art Gatenby on Nov 22, 2010 5:55:00 PM

A while ago on these pages I agonized about loss-on-drying moisture analysis . As you may recall, my explorations of the drying process overwhelmed me with evaporation concepts , vapor pressure notions, water content complexities and water activity witchcraft, all just to dry something.
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Topics: Evaporation, Moisture Analysis, Moisture Testing, Loss-On-Drying

Having Trouble Performing a duNouy Ring Test in Thick Samples?

Posted by Art Gatenby on Nov 15, 2010 3:29:00 PM

My musings were interrupted this week with a pressing challenge. It was stated like this:

 “My duNouy ring kept falling off the arm hook when attempting to immerse it into a high-viscosity sample.”

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Topics: duNouy Rings, Surface Tension Measurement, Surface Tension, Interfacial Tensiometer, tensiometers

Is Particle-Size Analysis Boring? Trivial? Amazing? Exciting? Vital?

Posted by Art Gatenby on Nov 2, 2010 3:57:00 PM

When I tell people at cocktail parties that we specialize in Particle-Size Analysis. I usually get a polite response of ------ “OH !!,”   which translates to “So who cares?”

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Topics: Sonic Sifter, Particle Size Analysis, Sieves, Sieving Process

Loss-On-Drying Moisture Analysis and Other Moisture Mysteries I

Posted by Art Gatenby on Oct 25, 2010 3:52:00 PM

One quiet night, I was musing over moisture analysis and how easy it is to do using loss-on drying. Little did I know what was in store.

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Topics: Moisture Analysis, Moisture Testing, Loss-On-Drying

Surface Tension by duNouy Rings or Wilhelmy Plates – Which to Choose?

Posted by Art Gatenby on Aug 19, 2010 5:16:00 PM

When tempted to think I know all there is about surface tension measurement, further information brings me back to earth. I’m conversant with the principal applications: surfactant analysis, plating, detecting contaminants, development of ink and the like. I have assisted customers to set up and calibrate duNouy Ring tensiometers for most applications -- all the while taking for granted that the Ring technique was the method of choice -- with only infrequent questions arising about Wilhelmy Plate tensiometers.

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Topics: Wilhelmy Plates, duNouy Rings, Tensiometer, Surface Tension

Certify Sieves or Calibrate Sieves --- Should You Do It?

Posted by Art Gatenby on Jun 30, 2010 4:57:00 PM

The relative value of a sieve certification process vs a sieve calibration has perplexed me for a long time.

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Topics: Sieve Shakers, Mid-Point Sieves, Particle Size Analysis, Sieve Calibration, Sieve Testing, Sieves

View from Inside a Karl Fischer Titration Cell.

Posted by Art Gatenby on May 17, 2010 4:26:00 PM

 When people are looking for a way to measure small amounts of moisture, we often recommend the Karl Fischer method.

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Topics: Karl Fischer, Karl Fischer Titration

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