ASTM D7867 Measurement of Rotational Viscosity of liquid

ASTM D7867 Measurement of Rotational Viscosity of liquid

ASTM D7867 uses rotational viscometers to find out the temperature dependence of apparent viscosity of paints, inks, and similar liquid materials. The final values are expressed in SI units.

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    Scope:

    ASTM D7867 is useful to get information about the extent of temperature dependence which in turn is important to prepare a viscosity-temperature table or curve. This information would allow a manufacturer or user to predict the impact of heating the paint.

    Procedure:

    Three test methods are described in ASTM D7867:

    Test Method A is performed with a viscometer that has a concentric (coaxial) cylinder capability, with specimen sizes (2 to 20 mL). At low to medium shear rates, this test determines apparent viscosity as a function of temperature. Test Method B is performed with a viscometer that has cone/plate test geometry. In comparison to Method A, the smaller specimen size allows for better temperature control and rapid analysis of the viscosity-temperature profile. Test Method C is run either with coaxial cylinder geometry or cone/plate geometry. A shear rate ramp is done at a discreet temperature and the viscosity values are recorded.

    Video 01: Viscosity measurement using an Ostwald’s viscometer

    Specimen size:

    Temperature control for test methods A, B, and C are required to be set at ±0.2 °C most preferably within ±0.1 °C.

    Data

    In ASTM D7867, the viscosity is calculated as follows,

    Where,

    F is force

     μ is the viscosity of the fluid

    A is the area of each plate

    u/y   is the rate of shear deformation

    Conclusion:

    ASTM D7867 is useful to get information about the extent of temperature dependence which in turn is important to prepare a viscosity-temperature table or curve. 

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