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Capillary viscometer considerations

- May 13, 2018 -

First, washing and drying must be used to wash the viscometer before use, generally first with a solvent that can dissolve the viscometer residue residues repeatedly washed, then washed with alcohol or gasoline, and then use oleum or potassium dichromate lotion wash Soak for 2-3 hours, and finally rinse with tap water. Rinse with distilled water and put it in an oven. Raise the temperature to about 150oC, or invert it for several days at natural temperature and dry it.


Second, the oil: (except U.S. directly from the thick tube into the outside) with a small mouth with a rubber ball (ear ball) or syringe to connect the small tube on the small glass tube, the left hand holding the viscometer, and blocked with the index finger With a thick pipe spout, turn the viscometer upside down, insert a long glass tube with capillary tube into the sample, pull the syringe, and draw the sample to the second circle (so that the liquid level is tangent to the circle line), and then stand up. . After the counterflow is installed, clamp the latex tube with a clip and place it on the tube that holds the sample.


3. Constant temperature and vertical adjustment: Place the viscometer with the sample on the rack (on the clamp), turn the capillary left, right, front, and back vertically. Hold the temperature at the measurement temperature for 10 minutes. Start the measurement and write down. The outflow time between the first and second laps is generally three times (taken out of normal) to take the average.


Fourth, the available capillary diameter, measuring the sample viscosity range:

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