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


An Interview with Ross Clark

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




The following Q&A is with a customer who is using the Brookfield Spiral Adapter Accessory (SAA) which consists of a screw-shaped spindle rotating in cylindrical chamber. SAA is ideal for measuring the viscosity of paste-like materials where it is helpful to test at different rotational speeds and observe how viscosity changes vs. shear rate. The SAA was originally developed to evaluate solder paste for the electronics industry.

  • 1. Do you recommend flooding the chamber for 2 to 10 minutes at high rpm (60) before each sample to be tested?
    Yes, this is needed to prime the chamber so that the material will pump continuously through the chamber during the normal test.

    1. If so, won’t this change the viscosity of the sample being tested because it was sheered at high rpm for so long?
      Yes, the sample will be sheared during the priming step. This shear step in combination with the actual test that follows should be the same for each sample tested to ensure that they are tested under the same conditions.

  • 2. Can you please explain the % torque. This is the same as the % scale, correct?
    Yes Our current method requires the torque to be within 10 to 90%.
    1. a. Does this also pertain to the SAA?
      The torque reading for any viscometer reading should be within 10-100% to be within the accurate reading range of the instrument.
    2. b. We tested a sample at 1 rpm with the spiral spindle and the results were giving us a low % torque (~5%). Does this matter? What is the acceptable torque range for the Spiral Spindle?
      For any reading below 10% torque we do not make any accuracy statements.

  • 3. Do you recommend always using the speed of 1 rpm for testing samples?
    The test speed will depend on the materials you are testing. Typically lighter material are tested at higher speeds and heavier materials at lower speeds.

  • 4. In the manual, Appendix A states the spiral spindle factor for torque. Can you please explain this Table 1-A. We have a RV Rheometer. Is the table recommending the spindle speed? Or is it stating what the spindle factor is at that speed?
    This table is the factor for customer with a Dial instrument, in which they are recording the % torque and then converting to viscosity in cps.
    1. a. Do we have to do this conversion? We have the correct spindle on our Rheometer (S70).
      For customer with digital units this table is not needed as the instrument will perform this conversion when the correct spindle code is entered.

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

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Instant view of some dynamic viscosities of Newtonian fluids.

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The cup to viscosity conversion engine assumes fluid is Newtonian.

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Examples of values for typical food and personal care products

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