A grey rubber stopper is a specially designed sealing component used to close the top of blood collection tubes. These stoppers are typically made from medical-grade rubber or synthetic rubber compounds that are specifically chosen for their flexibility, durability, and biocompatibility. The "grey" designation refers to the color of the stopper, which is often associated with a specific type of rubber or material used for particular applications. In blood collection tubes, these grey rubber stoppers are common in the collection tubes that are used for tests requiring a non-reactive, stable environment.

The main purpose of the stopper is to prevent contamination and leakage while also protecting the sample from environmental factors like temperature, humidity, and air exposure, all of which can affect the integrity of blood samples. These stoppers also play a role in ensuring that the collection tube is properly sealed for safe transportation to laboratories.

One of the most important characteristics of grey rubber stoppers for blood collection tubes is their biocompatibility. Medical-grade rubber, often used for these stoppers, is carefully manufactured to meet the stringent safety standards necessary for medical and laboratory use. Biocompatibility ensures that the rubber material will not react with the blood sample or the additives inside the tube, which could alter the results of diagnostic tests.

Grey rubber stoppers are also non-toxic, providing a safe environment for both the patient and the healthcare professional. The materials used in these stoppers do not introduce any harmful chemicals or substances into the sample, making them suitable for a wide range of blood tests, from routine screening to more specialized diagnostic procedures.

This biocompatibility is particularly important because any interaction between the stopper and the blood sample could lead to compromised test results or even pose a risk to patients, especially in the case of highly sensitive tests. Therefore, manufacturers use high-quality, safe materials that meet international standards for medical equipment.

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Good formulation technology guarantees excellent leakage of butyl rubber stopper，Leakage <20mg
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 .
The most stringent process control ensures the cleanliness of the rubber stopper .