Fluidity > Rotational Viscometer

Rotational Viscometer


Available Models

Contact Us to Request a Quote or More Information:

800-621-4778 viscosity@cscscientific.com

Basic: Alpha

This simple, economical model does routine viscosity testing. It offers 18 speed settings ranging from 0.3-100 r.p.m.  

Standard: Smart

This model has 9 working memories, allowing the user to program tests for future use. It also comes with software that allows the user to transfer results to the computer for seamless record-keeping. Additionally, the user can program time settings, facilitating the measurement of Non-Newtonian fluids.

Advanced: Expert

This model features a 12-key touchpad, and allows the user to customize 54 speeds ranging from 0.01-200 r.p.m. The user may also program a more detailed test using step, multistep, and ramp functions. 

Intelligent: Premium

This highly sophisticated model offers users the ability to customize 2600 speeds ranging from 0.01-250 r.p.m. It comes with DataBoss software, which allows the user to program tests through a computer.

Compare the Models


LCP and LCP/B Low Viscosity Adapters

Used to perform accurate and reproducable readings on materials with viscosity as low as 1 cP (mPa*s). Supplied with spindle.

APM and APM/B Small Sample Adapters

Allows accurate viscosity measurements with small volumes (8-13 ml). Spindles available separately for purchase. 

Learn About Viscosity

Click Here to Visit the Viscosity Page

On the CSC Blog:

Can You Define Viscosity Without Feeling Thick?
How Does Surface Tension Relate to Viscosity?
Is Consistency Viscosity? Not Really!


Consistency vs. Viscosity

Newtonian vs. Non-Newtonian Fluids

An Adaptable Rotational Viscometer: Flexible Enough to Test What You Need.

Rotational Viscometers text tricky fluids

photo courtesy of Fungilab 

Rotational Viscometers and How They Work

Viscometers are used to measure the viscosity of sample substances. There are several different types of viscometers, and each measure viscosity in a unique way.

A rotational viscometer measures the torque required to turn a spindle in a fluid at a known speed, as a function of the viscosity of that fluid.

The torque required to turn the spindle is quantified as the shear stress acting across the surface area of the spindle. The fixed speed of the viscometer defines the shear rate.

Rotational viscometers can be used to test both Newtonian and non-Newtonians fluids, and measures a wide range of viscosity.  

The Fungilab Rotational Viscometer

This rotary viscometer is designed to meet your budget and specification requirements, and is capable of measuring both Newtonian and Non-Newtonian fluids at a wide viscosity range.

It comes in four models - Alpha Series, Smart Series, Expert Series, and Premium Series - with the Alpha Series being the most basic, and the Premium Series the most advanced.

Each model has three "types": Type L is for a low viscosity range, Type R is for a regular viscosity range, and Type H is for a high viscosity range. See the Measuring Ranges PDF for more information. 

Factors to Consider:


When measuring viscosity, it is important that the temperature of the sample remains constant throughout the testing. Changes in temperature can change the viscosity of any type of fluid.

Viscosity Range

Speed and torque ranges affect the viscostiy measurement range of a rotational viscometer. Each model of the Fungilab Rotational Viscometer offers several viscosity range options.

Spindles and Speeds

Choosing the right spindle and speed is a bit of a trial and error process. Each spindle measures a different range of viscosity. It is important to note that viscosity range is inversely proportional to the size of the spindle and to the rotational speed. 

Fungilab suggests using a spindle and speed that will obtain a torque reading between 15 and 95%, with a percentage higher than 50% being most recommended.

Fluid Type

To obtain a more precise measurement, it is important to know how the fluid sample will behave depending on fluctuations of shear rate. Note that there are several types of Non-Newtonain fluids - pseudoplastic, dilatant, plastic, thixotropic and rheopectic. (Get the infographic "Newtonian vs. Non-Newtonian Fluids" to learn more.) 

Sample Size

Fungilab recommends using a 600 ml sample. Using too little of a sample can affect the viscosity reading. if you need a smaller sample we offer an adapter for testing 8-13 ml of fluid.

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Product Specs, Pricing and More:

  CSC Online Store Master Series Rotational Viscometer

Measuring Ranges

Click on the button below to download a PDF showing the measuring ranges available for each model of the Master Series Rotational Viscometer.

Download the Measuring RangesPDF

Want to Know if the Rotational Viscometer Will Work for You? Ask Us:

CSC Scientific Company, Inc.

2799-C Merrilee Drive Fairfax, VA 22031

Phone: 800-621-4778

Fax: 703-280-5142  

Email: testsolution@cscscientific.com