Due to its partial solubility, RS-940 increases the viscosity of drilling muds, especially in low temperatures. Recommended concentration is from 5 to 20 kg/m3, adding reccurently concentrations of 0.71 to 1.43 kg/m3. Concentration of RS-940 may be increased up to 30 kg/m3 in high temperature.
When preparing a fresh fluid, RS-940 is recommended to be added last.
It is possible to add RS-940 in circulation cycle to reduce filtrate of the mud that is being used. Pilot runs are recommended to identify the optimum concentration.