The medical rubber used in the stoppers is formulated to be non-reactive and resistant to various chemicals, which minimizes the risk of contamination. This is especially important in cases where blood samples are being stored for long periods before testing. The rubber stopper ensures that no particles or foreign substances can penetrate the tube, helping to preserve the quality of the sample and avoid any false results.

Many blood collection tubes are designed with additives that aid in specific types of blood tests. These additives, such as anticoagulants, preservatives, or clot activators, are added to the tube to prepare the blood sample for analysis. The rubber stopper plays a crucial role in ensuring the proper function of these additives by preventing any spillage or evaporation of the liquid within the tube.

For instance, in tubes containing anticoagulants like EDTA, the rubber stopper helps maintain the proper balance of the additive and blood sample, ensuring that the blood does not clot before it reaches the laboratory. Similarly, for tubes containing preservatives, the stopper helps ensure that the chemicals remain in the correct concentration, which is crucial for tests such as blood culture or serum separation.

Medical rubber stoppers also make blood collection tubes easier to handle and safer to transport. When blood is drawn from a patient, the sample must be transported to a laboratory for analysis. The rubber stopper ensures that the tube remains securely sealed, reducing the risk of spills or leaks during transit. This is particularly important in cases where the blood sample must be transported over long distances, as it prevents any potential loss or contamination of the sample.

Moreover, the rubber stopper allows for easy identification and handling by laboratory professionals. Many rubber stoppers are color-coded to indicate the presence of specific additives in the tube, which helps healthcare providers quickly identify the correct tube for the required test. This feature helps streamline the testing process and reduces the likelihood of errors.

https://www.klstopper.com/product/pharmaceutical-rubber-stopper/butyl-rubber-stoppers-for-injection.html
Uses:  suitable for the sealing of injection liquid
Chemically stable, good compatibility
Few fragments upon piercing
A substitute for barrier film stoppers