In the high density region where both LST Heavy Liquid and SPT are used as heavy liquids (2.8 to 2.9 g/mL), it can be seen that the viscosity of SPT is considerably higher. At a density of 2.85 g/mL at 25 ºC, SPT has a viscosity of 20 cP, whereas LST has a viscosity of 10 cP. LST has similar viscosities to TBE and so mineral settling times remain comparable. As the viscosity of SPT is twice that of LST and TBE, its settling rates for mineral samples are therefore twice as long. This means that in practice the times required for separation when using SPT become prohibitively long.

LST viscosities decrease slightly with an increase in temperature. Figure 2 shows a 1.5 cP drop in viscosity when the temperature is raised from twenty to twenty-five degrees centigrade. Faster density separations can therefore be achieved through an increase in solution temperature.

 

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