ASTM D2364:15(R2021) pdf free download – Standard Test Methods for Hydroxyethylcellulose.
20. 1.2 A fence sensor to measure the torque developed by the specimen to the rotational displacement of the rotational element.
20. 1 .3 A coupling shaft or other means to transmit the rotational displacement from the motor to the specimen.
20. 1.4 A rotational element, spindle, or tool to lix the specimen between the drive shaft and a stationary position.
Nirh 2—Each rotational element typically covers a range of abut 2 decades of viscosity. The rotational element is selected so that the measured viscosity is between 10 and 90 % of the range of that rotational element.
Note 3—Coaxial cylinder rotational elements of the form shown in Fig. I are suitable for this standard.
20.1.5 A specimen container, approximately 64 mm in outside diameter, 152 mm in height, and 350 mL in volume, to contain the test specimen during testing.
20. 1 .6 A data collection device, to provide a means of acquiring, storing, and displaying measured or calculated signals. or both. The minimum output signals required for rotational viscometry arc torque, rotational speed, temperature, and time.
20. 1.7 A stand, to support, level, and adjust the height of the drive motor, shaft, and rotational clement.
20.1.8 Auxiliary instrumentation considered necessary or useful in conducting this method includes:
20. 1 .8. 1 Data analysis capability to provide viscosity, stress or other useful parameters derived from the measured signals.
20.1.8.2 A level to indicate the vertical plumb of the drive motor, shaft and rotational element.
20.2 Mechanical Stirrer—Agitator as shown in Fig. 2 or Fig. 3, attached to a variable-speed motor capable of 1500 r/min rotational speed.
Note 4—An agitator made with 38 mm (1.5 in.) three-bladed propellers is satisfactory for this purpose.
20.3 Watci- Bath, constant-temperature, set at 25°C and capable of maintaining that temperature to within ±0.2°C.
24. Scope
24.1 This test method covers the determination of the bulk density of hydroxyethylcellulose.
25. Summary of Test Method
25. 1 A weighed amount of hydroxyethylcellulose is transferred to a l00-mL graduated cylinder and the graduate vibrated to settle the powder.
26. Significance and Use
26.1 Density can relate to dry flow properties, rate of dissolution. Jumping. packaging. and storage space requirements.
27. Apparatus
27. 1 Vibrator—A magnetic-type electric vibrator attached to the vertical support rod of a ring stand approximately 0.3 rn above the base. A condenser clamp of sufficient size to hold a l00-mL graduated cylinder also shall he attached to the above rod. The base of the stand should be weighted.
30. Precision and Bias
30.1 Precision- Statistical analysis of intralaboratory (re-peatability) test results indicates a precision of士0.04 g/mL at the 95 % confidence level.
30.2 Bias- No justifiable statement on the bias of the procedure for measuring density can be made because no suitable reference material exists.