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VISCOSITY FORUM: Ask the experts

How do you test construction materials for

Measuring Viscosity? Kinematic or Dynamic Method. How to Choose?

11/21/13 at 11am EST

An Interview With Pat Maggi

Capillary and rotational viscometers are used around the world to measure viscosity. Why are there two different methods? Does each have certain advantages that recommend its use for certain categories of materials? This interview will review various test methods that encompass one or the other technique and provide guidance on how best to proceed when in doubt on the choice. read more

How do you test construction materials for

How do you test construction materials for "flowability"?

11/6/13 at 11am EST

Dr. Guy Rosenthal Interview

How do you test construction materials for "flowability"? For example, when you open a tub of joint compound, does it have the right consistency? Do you know right away when you stick your trowel in? Or is the proof of the pudding in how it spreads? read more

Life Below the Yield

Viscometer vs. Texture Analyzer

10/23/12

An Interview with Ross Clark

When does a viscometer make sense and when does a texture analyzer make sense? read more

 

BROOKFIELD RESPONDS: Q+A

08/2016

Customer Challenge: How do I choose a viscosity value when running a QC test with a T-bar spindle on a pasty material that has particles? The viscosity fluctuates significantly during the test. The viscometer runs for 2 minutes and the values vary from 230K cP to 400K cP.


  • Brookfield Answers: One approach is to report the min and max viscosity values. Another is to calculate an average value. New viscometers, like Brookfield’s DV2T, have the ability to automatically calculate an average value for this type of test as well as report min/max values.

    When R&D introduces a T-bar test method to QC, they should have graphical data that shows T-bar viscosity vs. time. R&D should specify viscosity control limits for min/max values and an average value. This baseline information is needed by QC so that variances recorded during startup testing are reported back to R&D. Fine tuning the test method and the pass/fail specifications may be necessary.
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VISCOSITY OF WATER TABLE

View the viscosity of water at temperatures between 0 - 100° C.

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VISCOSITY OF MATERIALS TABLE

Instant view of some dynamic viscosities of Newtonian fluids.

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VISCOSITY CALCULATOR

The cup to viscosity conversion engine assumes fluid is Newtonian.

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YIELD STRESS VALUES

Examples of values for typical food and personal care products

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