Hoppler viscometer

Van Selms and Kruyt applied the principle of the rolling sphere viscometer (Hoppler viscometer) to thixotropic or rather to false body systems. The method allows one to obtain D-t curves though not on an absolute scale. Consequently it gives a measure for the gel strength and if the measurements are repeated after different waiting times, also for the rate of solidification. 

The pH is measured using a 4% aqueous solution. Viscosity is normally measured using a Brookfield viscometer. Alternatively, a capillary viscometer or falling ball such as Hoppler may be employed. The type of viscometer used must always be noted. 

Fig. 6. Flow diagram of suspensions of quartz in mixtures of C2H2C14 and with the addition of small amounts of water, measured in a Hoppler type viscometer with variable inclination (F. G, Van Selms and H. R, Kruyt,...

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