ASTM D6319 ISO 11193 医用手套拉伸测试
ASTM D6319, ISO 11193, and EN 455-2 are standards used by the biomedical industry to regulate the tensile properties of medical gloves. Used primarily during the quality control process, these tests ensure that the glove material meets expected criteria for tensile strength and elongation so that the gloves do not fail during use. This is extremely important, as glove failure in medical settings could expose the care provider or patient to dangerous and potentially life-threatening contaminants.
Medical gloves are manufactured from a wide variety of materials and are designed for different applications. Materials used for medical gloves generally vary from latex to nitrile, PVC, natural rubber, or polychloroprene, with the requirements for surgical gloves being more stringent than those designed for patient examination. Though there are three standards commonly used to evaluate their tensile properties, their differences are minor, and all require the same basic test setup and procedure. This guide will provide a general overview of the testing process, but should not be considered a substitute for reading the full published standards.
Materials Testing System
Despite the importance of medical glove testing, the procedure itself is fairly straightforward. Most testing to ASTM D6319, ISO 11193, and EN 455-2 can be easily performed on a single column universal testing machine such as Instron's 34SC-5, though labs looking to use their test system for a wider variety of applications may prefer a high-tier 6800 Series test frame in order to take advantage of its additional features. Because medical gloves are made of high-elongation elastomers, an extra height test frame may be required. Due to the low forces involved, a 500 N load cell is considered the maximum when testing to these standards.
| Glove Test Setup | |
|---|---|
| 1) | Load Cell A 500N load cell is an appropriate capacity for all glove materials. |
| 2) | Pneumatic Grips Air pressurized grips ensure consistent clamping forces Jaw faces are easily interchangeable to ensure the correct surface texture is used for the material. Elastomeric materials like rubber gloves typically require rubber coated faces due to how thin the specimen is. The rubber coating is able to prevent slippage of the material without damaging the specimen. |
| 3) | Bluehill Software The biomedical method suite includes preconfigured methods for EN455-2 |
| 4) | Elastomeric Roller Grips Roller grips provide a cost effective gripping solution for thin elastomers The roller grip utilizes a proportional clamping pressure which increases as more force is applied to the specimen |
| 5) | AVE 2.0 An optical non-contacting strain device can be used to ensure more accurate strain measurement |
| 6) | Specimen Preparation All the major ASTM/ISO/EN standards require a dumbbell shaped specimen to be stamped from the palm of the glove EN 455-2 takes into consideration the potential discrepancies in thickness between the palm and the fingertips. The standard compares their thickness and uses a correction factor for the tensile strength of the speicmen. |
