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Normas ASTM – AENOR
ASTM D5478-98

ASTM D5478-98

Standard Test Methods for Viscosity of Materials by a Falling Needle Viscometer

Fecha:
2017-08-16 /Historical
Superseeded by:
Scope:

1.1 These test methods cover the measurement of the viscosity of Newtonian and non-Newtonian liquids. These test methods are applicable to liquids having viscosities in the range from 5 X 10 -4 to 10 Pa[dot]s (0.5 to 10 cP). The shear rate range is dependent upon the needle used and viscosity of the liquid and may vary from 10 -4 to 10 s -1 .

1.2 The yield stress of liquids having this property may also be determined.

1.3 These test methods consist of determining liquid viscosities of Newtonian and non-Newtonian fluids (clear or opaque) by measuring the steady-state (constant) or terminal velocities of cylindrical needles as they fall through the test liquid under the influence of gravity. Yield stresses of non-Newtonian liquids may be measured using the same procedure.

Keywords:
falling needle viscometer; Newtonian fluid; non-Newtonian fluid; rheological property; rheometer; viscometer; viscosity; yield stress
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