ISI 17-1e Determination of Viscosity of Starch by Brookfield
ISI 17-1e Determination of Viscosity of Starch by Brookfield 1. Scope The method is applicable to native and modified starch - preferably starch for sizing of paper and textiles. LT 7. Oct. 2002. 2. Principle Viscosity of starch size prepared by indirect heating is measured as torque on a rotating spindle at constant speed and temperature 3. Apparatus 3.1 Brookfield Viscometer RVDV-E (RV range) Alternative: LV range 3.2 Beaker, 1000 ml 3.3 Laboratory scale 3.4 Agitator with paddle stirrer IKA EUROSTAR digital + IKA paddle stirrer R1373 3.4 Boiling water bath and lid with slit for paddle stirrer Bath large enough for lid to cover bath and beaker 4. Procedure Weigh starch sample equivalent to 50 g (w) dry substance (DS) in a beaker (3.2) and add distilled water bringing total weight of starch and water to 500 g. Put stirrer (3.4) in the beaker. Weigh the total weight of beaker, stirrer, starch and water (W g) Transfer beaker (3.2) to a boiling water bath. Attach stirrer to agitator an