CSC Scientific Blog

A blog about test equipment

CSC Scientific Blog

What are Liquid Properties? Why Should Anyone Care?

Posted by Art Gatenby on Aug 10, 2017 2:59:24 PM

The first question is, "What are Liquid Properties?" Are they some kind of underwater real estate?

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Topics: Automatic Surface Tension Measurment, Measure Viscosity, Consistency, contact angle, density

How Long Does a Water Activity Test Take?

Posted by Amanda Ranowsky on Jul 27, 2017 8:00:00 AM

The answer to the question, “How Long Does a Water Activity Test Take?” is, as with most testing questions, “it depends.” Some water activity meters promise a test completed in a very short time; some in as little as five minutes. This time is an arbitrary selection that may or may not produce a satisfactory result.

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Topics: Bound Moisture, Free Moisture, Moisture Analysis, Water Activity, Moisture, water activity measurement

How Much Do Rotational Viscometers Cost - And Why?

Posted by Amanda Ranowsky on Apr 19, 2017 8:15:00 AM

Looking at the rotational viscometers on the market today, you'd expect to see small price differences between the instruments offered by competing brands. But what if you find one viscometer priced at $2000 and another at $9000? Is the $9000 viscometer a better instrument? Why is there such a price difference between the two instruments? 

Viscometer prices depend on both the make-up of the instrument's motor, and on the technical features of the instrument (temperature probe, speed range, USB compatibility, etc.). There are two main types of rotational viscometers: those using a spring motor, and those using a servo motor. 

In this article, I’m going to take a look the options available for rotational viscometers, and how those options affect the price.

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Topics: Viscometers, Viscosity, Dynamic Viscosity, rotational viscometer

How to Get Consistent and Accurate Test Results with a Rotational Viscometer

Posted by Amanda Ranowsky on Mar 22, 2017 8:00:00 AM

Most rotational viscometer specifications promise high test accuracy and repeatability. However, an instrument on its own cannot guarantee accurate results. Instrument set-up and using the right test parameters are critical pieces of the puzzle. 

Test parameters and turbulence are two key factors to consider when preparing to test with a rotational viscometer. The spindle, speed setting, and temperature of the product are some of the parameters that can impact test results. Additionally, turbulence in the sample’s flow during a test will distort viscosity readings. Knowing how to manage these two factors can significantly contribute to the accuracy of your testing.

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Topics: Measure Viscosity, Viscometers, Viscosity, Dynamic Viscosity, rotational viscometer

What Does A Moisture Balance Cost?

Posted by Art Gatenby on Mar 13, 2017 3:28:57 PM

Loss on Drying (LOD) Moisture Balance analysis is based on drying a sample and comparing the difference in weight before and after drying. 

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Topics: Moisture Testing, Loss-On-Drying, moisture balance

Do You Need An Automatic Tensiometer?

Posted by Art Gatenby on Dec 6, 2016 5:16:09 PM

This is an update of an article originally published in December 2013 - Three years ago.

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Topics: Automatic Digital Tensiometer, Automatic Surface Tension Measurment, Surface Tension Measurement

A Sieve Shaker's Passing From Noise To Quiet

Posted by Art Gatenby on Oct 26, 2016 2:26:45 PM

Quiet Sieve Shakers

Recently in a quiet, reflective moment, I recalled my first work with sieve shakers. Horizontal motion with tapping was the basic shaker design. The Ro-Tap® was King, and there were few alternatives. Different shakers for special applications, such as the Mary Jane and one that was hung from the ceiling, were the exception. 

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Topics: Sieve Shakers, Sonic Sifter, Particle Size Analysis, Quiet sieve shakers, RoTap, Noisy Sieving, sieving, Endecotts, vacuum sievers

A Spotlight on Rotational Viscometers

Posted by Art Gatenby on Oct 3, 2016 10:45:00 AM

You probably know that rotational viscometers work by measuring the torque on a vertical shaft that rotates a spindle.  The spindle is in the test sample and its rotation is impeded in proportion to the viscosity of the sample. These instruments measure viscosity.

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Topics: Viscometers, Viscosity

Should You Move to "Actual" Surface Tension?

Posted by Art Gatenby on Sep 8, 2016 4:31:38 PM

An understandable definition of surface tension: The attraction force between molecules at the surface of a liquid. The force that keeps if from flying off into space.

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Topics: Tensiometer, Surface Tension Measurement, Surface Tension, actual surface tension, apparent surface tension

Initiation to Contact Angle

Posted by Art Gatenby on Aug 11, 2016 4:24:42 PM

A classical definition of Contact Angle:

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Topics: Surface Tension, contact angle, contact angle meter, dynamic contact angle

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