In particular, grey rubber stoppers are often used in tubes designed for certain specialized blood tests, such as those that require a vacuum-sealed environment. These tests often involve the collection of blood from patients with specific medical conditions or for specific diagnostic purposes. The grey rubber stopper is designed to handle the pressure changes that occur during blood collection, ensuring that the vacuum environment is maintained throughout the process.

Once the blood is collected and sealed in the tube, it is crucial that the sample is handled and transported properly to avoid any damage or contamination. The grey rubber stopper plays a vital role in facilitating the safe transport of blood samples from the point of collection to the laboratory for testing. Blood samples can be delicate, and improper handling could cause hemolysis (destruction of red blood cells) or other alterations that compromise test results.

The rubber stopper helps minimize the risk of spillage or leakage, even when the tubes are subjected to handling during transportation. Whether the tubes are being transported in medical facilities, clinics, or between different laboratories, the stopper ensures that the blood remains secure and undisturbed. This level of security is especially important for tests that require a fresh sample or a sample that is highly sensitive to contamination, such as tests for infectious diseases, hormone levels, or blood cultures.

In addition, the grey rubber stopper is often designed with a color-coded system that corresponds to the type of additive inside the blood collection tube. This color-coding helps laboratory personnel quickly identify the type of tube and its corresponding test requirements, preventing errors and improving efficiency in the lab.

In many blood collection tubes, especially those used for hematology or chemistry tests, a vacuum is created inside the tube to draw blood into the collection tube during the venipuncture (blood draw). The grey rubber stopper ensures that the vacuum remains intact, which is essential for drawing an accurate volume of blood. The vacuum helps to fill the tube to the correct level, ensuring that the correct amount of blood is collected for testing.

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Ultra-low metal dissolution, can be used for human blood metal detection
Special surface treatment technology eliminates the effects of silicon treatments on blood products .
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