Viscosity Testing

Viscosity is a fundamental physical property that describes a fluid’s resistance to flow and reflects how easily a liquid moves when subjected to an applied force. Viscosity is a critical parameter in product performance, processing behavior, quality control, and safety evaluations. In chemical reactivity applications, viscosity influences heat transfer, mixing, and flow, making it an important input for vent sizing and emergency relief system design.

Viscosity measurements are performed using the Brookfield DV3T Rheometer instrument, which determines viscosity by measuring the torque required to rotate a spindle immersed in the test material at a controlled speed. The viscous drag is converted into viscosity values, typically reported in centipoise (cP) or milliPascal-seconds (mPa·s).

Testing can be performed on liquids, as well as solid or semi-solid materials that become fluid at the test temperature.

Instrument

Brookfield DV3T Rheometer with Thermosel high-temperature system

Temperature-dependent testing is conducted using the Brookfield DV3T Rheometer for elevated temperatures and a refrigerated circulating bath for sub-ambient conditions. External temperature control allows viscosity measurements from approximately −25°C up to 300°C using appropriate temperature-control accessories. Viscosity data collected across this full temperature range supports a realistic interpretation of material behavior under dynamic and reactive conditions.

Applicable Standards

• ASTM D2196, "Standard Test Method for Rheological Properties of Non-Newtonian Materials"
• ASTM D2983, "Standard Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants”
• ASTM D4402, "Standard Test Method for Viscosity Determination of Asphalt at Elevated Temperatures"

Sample Preparation

Samples can be run "as-received" or prepared in our laboratory. Our test design experts have handled everything from highly toxic or flammable samples, regulated, gas condensation, catalyst injection, and more.

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