Methyl cellulose - Determination of kinematic viscosity
According to the 2020 Chinese Pharmacopoeia standard viscosity measurement standard method is as follows:
For the test product labeled with viscosity less than 600mPa·s, take 4.0g of this product (according to the dry product), add 196g of water at 90℃, stir fully for about 10 minutes, cool in the ice bath, continue stirring during the cooling process, keep stirring for another 40 minutes, add cold water to the total weight of 200g, stir evenly, and adjust the temperature to 20℃±1℃. If necessary, the bubbles in the solution can be removed by decompressive method or centrifugal method, and the flat viscosity meter suitable for the inner diameter of the capillary tube is selected and measured according to law (general rule 0633 method). The viscosity should be 80% ~ 120% of the labeled viscosity;
ST204B automatic Ping's kinematic viscometer (developed and produced by Shandong Shengtai Instrument Co., LTD.) is suitable for the design and manufacture of the general Rule 0633 viscosity measurement method in 2020 "Chinese Pharmacopoeial". This method is to use the relative method to measure the time required for a certain volume of liquid to flow through capillary under the action of gravity, so as to obtain the kinematic viscosity of the fluid.
ST204B automatic drug viscosity meter automatic mode with automatic constant temperature, automatic extraction, automatic timing, automatic calculation, automatic printing, automatic cleaning, automatic drying and a series of automatic functions, when using only a sample injection click start to complete the test.
Methods: Viscosity was determined according to general rule 0633 of Chinese Pharmacopoeia
Temperature range: room temperature +5℃ ~ 120.0℃;
Management rights: Including level 3 management rights
Temperature control accuracy: ±0.1℃;
Timing range: 0.0s ~ 999.9s;
The measuring range of Pinnett viscosity is 0.6-17000mm2/s
Timing accuracy: 60min is not greater than ±0.01%;
Number of samples: 2 sets of capillary viscometers (indicate viscosity coefficient range when ordering);
Use environment: ambient temperature 10℃ ~ 35℃, relative humidity ≤ 85%;
Temperature sensor: Pt100 platinum resistance;
Rated power: 1800W.