ASTM D7836-13 Measurement of Yield Stress of Paints, Inks, and Related Liquid Materials

 ASTM D7836-13 Measurement of Yield Stress of Paints, Inks, and Related Liquid Materials

ASTM D7836-13 covers three approaches for measuring yield stress values of paints, inks, and related liquid materials. It is done by using a viscometer, rheometer, and viscometer with a vane spindle. The applied stress ramp on material increases the yield stress of that material. The yield stress depends upon the maximum torque value.

    Scope:

    ASTM D7836-13 method for stress measurements have been useful in establishing root causes of flow problems such as extreme orange peel and sagging etc. The stress ramp applied to the material exceeds the yield stress of the material. Torque increases the rotation of the spindle and the value of the torque converted into a yield stress value. Yield stress value may be measured by discrete temperature, in this way, the material can be tested within its packaging.

    Procedure:

    Yield stress can be measured in three ways. Test Method A uses a viscometer with coaxial shear stress versus shear rate determines dynamic yield stress. “Dynamic” indicates that the material has been allowed to flow and that the yield stress value is mathematically calculated accordingly. Test Method B uses a stress rheometer to determine a yield stress value. As the torque applied to the spindle the yield stress in the material is exceeds. The stress reading at the onset of spindle rotation is the yield stress value for the material. Test Method C uses a rotational viscometer. The vane spindle is rotated slowly at a fixed speed The yield stress value is determined when the torque value reaches a maximum.

    Result:

    In this way, the above-mentioned methods, yield stress of paints, inks, and related liquid materials can easily be determined.

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