CSC Scientific Blog

A blog about test equipment

CSC Scientific Blog

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: Surface Tension, duNouy Rings, Interfacial Tensiometer, Surface Tension Measurement, tensiometers, Liquid Properties

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

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

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

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

Static Electricity and Sieves: No Problem -- Maybe

Posted by Art Gatenby on Apr 21, 2010 2:02:00 PM

I'll bet that most of you have experienced the shock of walking on a thick wool rug on a dry winter's day and getting zapped out of your reverie when reaching for the metal door knob.


The same process of static electricity generation can play havoc with your sieving process.

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Topics: Sieve Blinding, Agglomeration, Sieves, Sieve Testing

Is My Test Equipment Lying?

Posted by Art Gatenby on Mar 9, 2010 4:45:00 PM

I keep running into this kind of thing.

There is a recurring question we are asked as instrument manufacturers:

"Is my equipment working OK?"

This is of particular concern when a production process seems to be off standard.

QC says: "Clearly Process Problems"

Production says: "Bad Test Results"

These challenges arise often.

What to do?

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Topics: Surface Tension, Liquid Properties

Re-Certify Mid-Point Sieves? When and How?

Posted by Art Gatenby on Jan 29, 2010 12:24:00 PM

I recently had a long conversation with the person [we'll call him Bill] responsible for setting up the quality procedures for very tight specifications in a new process -- part of which was developing procedures for checking the ongoing tolerances of production sieves.
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Topics: Sieves, Sieve Calibration, Mid-Point Sieves, Sieve Testing

Is Your Moisture Test Result Really Moisture?

Posted by Art Gatenby on Jan 11, 2010 11:22:00 AM

Most of us think about measuring moisture by...

  1. Drying the material and measure the weight loss 
  2. Using a calibration and electronic instrument 
  3. Using a titration method such as Karl Fischer

When using these processes, we take for granted that the results will be the product's actual moisture.

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Topics: Moisture Oven Test, Infrared Moisture, Moisture Analysis, Karl Fischer Titration, Loss-On-Drying, Moisture Testing

New ASTM E11-09 Sieve Standards — Exciting or Just Dull ???

Posted by Art Gatenby on Oct 6, 2009 5:42:00 PM

I have often ranted about the limited range of ASTM 11 sieve mesh standards as it relates to individual sieve certification. We at CSC have tried to help clearly distinguish between different levels of inspection and/or degrees of conformity. We outlined three levels of sieve certification. These are working sieves, mesh certified sieves and mid point sieves. There are summary definitions of these categories on the CSC Web site.

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Topics: Particle Size Analysis, Sieve Shakers

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