Sealing test of 50ml centrifuge tubes
There are many different kinds of laboratory consumables, but the most familiar and frequently used ones are probably the tubes, such as 50 ml centrifuge tubes. Centrifuge tubes are mainly used with centrifuges and are inevitable consumables. There are plastic and glass centrifuge tubes commonly used in laboratories, and plastic tubes are generally used more often because glass tubes cannot be used in high-speed or ultracentrifuges. The plastic centrifuge tubes are made of PP (polypropylene), PC (polycarbonate), PE (polyethylene), etc. The performance of PP tubes is relatively good. The plastic centrifuge tubes are transparent or translucent, so you can visually see the sample centrifugation, but they are more easily deformed and less resistant to the corrosiveness of organic solvents, so their service life is shorter. Therefore, laboratories usually buy centrifuge tubes frequently.
The sealing performance of 50 ml centrifuge tube is an important factor affecting the accuracy of experimental analysis results.
Most of the centrifuge tubes are equipped with a cap, if the cap is poorly matched with the tube, the seal is not tight, it is easy to lead to liquid spillage, leakage, corrosion of the centrifuge, affecting its service life, for the liquid containing volatile components, but also easy to cause the loss of volatile components, the impact on the content of the components in the centrifuge tube, and then cause deviations in the experimental results. Therefore, the lid and the centrifuge tube should have a good seal. In this regard, the sealing test process can be carried out by the sealing tester to provide reference for enterprises to verify the sealing performance of the centrifuge tube. Plastic centrifuge tubes are used as test samples. Commonly used in the production of plastic centrifuge tube materials are polyethylene, polycarbonate, polypropylene, etc., of which polypropylene plastic centrifuge tube performance is better. Flexible plastic packaging parts, packaging container sealing performance testing commonly used testing equipment for sealing test instrument.The test principle is as follows.
The basic test principle of this equipment is the principle of negative pressure method, that is, through the vacuum to make the sample in the external environment to a certain degree of vacuum, so as to form a certain pressure difference between the inside and outside of the sample, if the sample is poorly sealed, its internal gas will be sealed under the action of the pressure difference from the sample inside outward, by observing whether the sample surface in water continuous bubble generation or after the release of vacuum The sealing performance is determined by observing whether continuous bubbles are generated on the surface of the sample in water or the shape of the sample recovers after the vacuum is released.
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