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Tensile strength and elongation at break are crucial indicators of the mechanical properties of medical-grade disposable gloves. For instance, in the case of disposable medical rubber examination gloves, the standard GB 10213-2006 stipulates that the tensile strength before aging should be no less than 15 MPa, and the elongation at break should be no less than 500%. For disposable sterile rubber surgical gloves, the requirements are even stricter, with a tensile strength before aging of no less than 18 MPa and an elongation at break of no less than 600%.
To test these properties, a universal materials testing machine is typically used. Samples are cut from specific parts of the gloves, such as the palm area, and placed in the clamps of the testing machine. The machine then stretches the samples at a constant speed until they break, and the maximum tensile force and the elongation at break are recorded. This process helps ensure that the gloves can withstand the mechanical stresses during medical procedures without breaking easily.
The puncture resistance of medical gloves is directly related to their ability to block bacteria or viruses. A standard method for testing puncture resistance is outlined in YY/T 0616.4-2018. A specialized puncture device is used, which consists of a puncture probe mounted on a testing machine. The probe moves at a speed of 200 mm/min under a load and is used to puncture the glove samples. A total of 12 puncture tests are carried out, and the average value is calculated.
For example, in some medical settings, gloves may come into contact with sharp medical instruments such as needles or scalpels. If the puncture resistance is insufficient, the gloves can be easily punctured, allowing pathogens to pass through and increasing the risk of cross-infection between patients and medical staff. Therefore, ensuring adequate puncture resistance is essential for the safety of medical gloves.
The leakage test is designed to check if there are any holes or defects in the gloves that could allow the passage of liquids or microorganisms. One common method is the water leakage test. In this test, a certain amount of water (usually 1000 mL) is injected into the glove, and the glove is then hung for a specified period (usually 2 minutes). The amount of water that leaks out is measured. According to relevant standards, the leakage should not exceed 1 mL for the gloves to be considered合格 (qualified). This test is crucial as even a small hole in the glove can compromise its protective function and lead to the spread of infections.
Heavy metals such as lead, cadmium, and zinc can be present in medical gloves due to the raw materials used or the manufacturing process. These heavy metals can be harmful to human health if they leach out of the gloves and come into contact with the skin or mucous membranes. For example, lead can accumulate in the body and cause damage to the nervous system, kidneys, and other organs.
To detect the content of extractable heavy metals, techniques such as inductively coupled plasma mass spectrometry (ICP-MS) can be used. Samples of the gloves are first subjected to an extraction process using a suitable solvent to dissolve the heavy metals. Then, the extracted solution is analyzed using ICP-MS to determine the concentration of each heavy metal. Standards such as GB/T 16886.10 provide guidelines for the maximum allowable levels of heavy metals in medical gloves to ensure their safety for use.
In addition to heavy metals, medical gloves may also contain other residual chemical substances, such as plasticizers, accelerators, and antioxidants used in the manufacturing process. Some of these substances can cause skin irritation, allergic reactions, or other adverse health effects. For example, certain plasticizers used in polyvinyl chloride (PVC) gloves have been associated with endocrine disruption.
To test for residual chemical substances, methods such as high-performance liquid chromatography (HPLC) or gas chromatography-mass spectrometry (GC-MS) can be employed. These techniques can separate and identify the different chemical components in the glove samples and quantify their concentrations. By setting strict limits on the levels of these residual substances, manufacturers can ensure that their medical gloves are safe for use in medical settings.
For natural rubber latex gloves, the protein content is an important consideration. Some people are allergic to natural rubber latex proteins, and exposure to these proteins can cause allergic reactions ranging from mild skin irritation to more severe anaphylactic shock. Therefore, it is necessary to control the protein content in latex gloves.
Methods such as the modified Lowry method or enzyme-linked immunosorbent assay (ELISA) can be used to measure the protein content in glove samples. The modified Lowry method is a colorimetric assay that quantifies the total protein content based on the reaction of proteins with a specific reagent. ELISA, on the other hand, is a more specific method that can detect and quantify specific latex proteins. Standards such as GB 24788-2009 set limits on the protein content in medical gloves to reduce the risk of allergic reactions in users.
For sterile medical gloves, ensuring their sterility is of utmost importance. Sterile gloves are used in surgical procedures and other invasive medical operations where any microbial contamination can lead to serious infections. The sterility test is usually carried out using a membrane filtration method as specified in GB/T 14233.2.
In this test, a sample of the glove is placed in a sterile container with a suitable diluent, such as physiological saline or cell culture medium. The mixture is then filtered through a sterile membrane filter to trap any microorganisms present. The membrane is then transferred to a culture medium and incubated at an appropriate temperature for a specified period (usually 14 days). If no microbial growth is observed on the culture medium, the gloves are considered sterile.
Bacterial endotoxins are toxic substances released from the cell walls of Gram-negative bacteria. Even in small amounts, bacterial endotoxins can cause fever, inflammation, and other adverse reactions in the human body. Therefore, it is necessary to test for bacterial endotoxins in medical gloves, especially those used in surgical procedures.
The most common method for detecting bacterial endotoxins is the limulus amoebocyte lysate (LAL) test. In this test, a sample of the glove is extracted with a suitable solvent, and the extracted solution is mixed with LAL reagent. If bacterial endotoxins are present in the sample, they will react with the LAL reagent to form a clot or cause a color change, which can be detected and quantified. Standards set limits on the amount of bacterial endotoxins allowed in medical gloves to ensure their safety for use.
The cytotoxicity test is used to evaluate the potential of medical gloves to cause cell damage or death. This test is important because if the gloves release toxic substances that can harm cells, they may also cause tissue damage or other adverse effects when in contact with the body.
One common method for cytotoxicity testing is the MTT assay. In this assay, cells are cultured in the presence of extracts from the glove samples. After a certain period of incubation, a reagent called MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) is added to the cells. MTT is reduced by viable cells to form a purple formazan product, which can be quantified by measuring its absorbance at a specific wavelength. A decrease in the amount of formazan indicates cell damage or death, suggesting that the glove extracts are cytotoxic. By conducting cytotoxicity tests, manufacturers can ensure that their medical gloves are biocompatible and safe for use in medical applications.
