Semi micro Ubbelohde viscometerIt is a classic instrument used for accurately measuring liquid viscosity and belongs to an important branch of capillary viscometers. Its core advantage lies in "semi trace" - testing can be completed with only a small amount of sample, combining high precision and sample economy, widely used in fields such as polymer materials, pharmaceuticals, chemicals, and food.

Its core functions include:

Viscosity measurement: directly measuring the dynamic viscosity or kinematic viscosity of liquids, suitable for precise analysis of dilute solutions such as polymer solutions and food additives.

Molecular weight characterization: By correlating the intrinsic viscosity with the viscosity average molecular weight using the Mark Houwink equation, key data is provided for the determination of molecular weight in polymer materials such as polyvinyl alcohol and polyacrylamide.

Process optimization: Used in fields such as food, pharmaceuticals, and chemical engineering to evaluate the impact of formula adjustments and processing techniques on product viscosity, and guide production parameter optimization.

　　Semi micro Ubbelohde viscometerThe accuracy depends on standardized operations, and the following points should be noted:

Cleaning and drying: After each test, the capillary tube and tube section should be repeatedly rinsed with solvent to avoid residual samples affecting the next test; After cleaning, it needs to be dried and no residual moisture is allowed.

Strict temperature control: Temperature has a significant impact on viscosity, so it is necessary to immerse the viscometer in a constant temperature water bath and wait for the sample temperature to equilibrate with the water bath before testing.

Bubble free operation: When adding the sample, it should be done slowly to avoid the generation of bubbles; If bubbles appear, use an ear wash ball to gently remove them.

Correct timing: Timing should start from when the liquid meniscus reaches the "upper scale line (E)" and end when the meniscus reaches the "lower scale line (F)", with the line of sight level with the scale line.

Instrument calibration: After new instrument or long-term use, it is necessary to calibrate the "instrument constant K" with standard liquid to ensure accurate calculation results.