Gasket selection
When any type of gasket is used, in order to ensure long-term effective sealing, the following eight important characteristics must be paid attention to when selecting and using the gasket:
1. Gas seal of gasket
For the medium of the sealing system, the gasket can be used for a certain time within the appropriate temperature and pressure range without leakage.
2. Compressibility of gasket
After the connection bolts are tightened, the contact surface of the gasket and flange should be well matched to ensure the sealing
3. Creep resistance of gasket
Under the influence of pressure load and service temperature, the gasket should have better creep resistance, otherwise it will cause bolt torque loss, reduce the surface stress of the gasket, and cause certain leakage.
4. The chemical properties of the gasket
The selected gasket needs to be able to withstand the corrosion of the medium, and at the same time, it must not cause pollution to the sealed medium. The current sealing products need to meet the environmental protection standards. For example, the BD series of sealpilot uses absolutely environmentally friendly non-asbestos sealing material Impact on sealing and environment
5. The resilience of the gasket
Even when the system is stable, there will be a slight displacement due to the temperature and pressure of the two connected flanges. The elastic function of the gasket needs to compensate for this displacement to ensure the tightness of the system.
6. Anti-stickiness of gasket
The gasket should be easily removed from the flange when it is replaced after use, without sticking
7. Corrosion of gasket
Gaskets should be non-corrosive to the sealing system and the flange itself
8. Temperature and pressure of gasket
The selected gasket should ensure that it can be used normally under the condition of the lowest temperature pressure and the highest temperature pressure of the sealing system.
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At present, in the process of isolation and preparation of various stem cells from various tissue sources, Centrifuge Tubes with a volume of 15ml and 50ml are used.
It is one of the low-value consumables with high usage rate. It is generally installed on a dry foam rack with the package or in bulk. When used, it is taken out by the operator and placed on the plastic centrifuge tube rack in the ultra-clean workbench. The common centrifuge tube rack can only make the centrifuge tube stand upright. When transferring liquid or needing centrifugation, the operator should hold the centrifuge tube in the left and the night gun or aspirator in the right. If it is necessary to transfer a large amount of liquid reagents or perform gradient centrifugation operations, such as density gradient centrifugation to separate mononuclear cells, the operator needs to hold the centrifuge tube with the right hand for a long time and tilt the centrifuge tube, which often causes the operator's wrist joint pain. At the same time, it will also affect the liquid superposition effect, which will easily lead to the mixing of liquids of different densities, resulting in the failure of the experiment.
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