Medical Glove Testing
Medical gloves can be manufactured from materials such as latex, nitrile, and vinyl; all of which must adhere to performance levels specified by the FDA and international standards, including ASTM D6319, ASTM D5250, EN 455-2, ISO 11193-1:2002, and ISO/AWI 11193-2. Typically, medical glove manufacturers test the mechanical properties of new gloves in addition to gloves that have undergone accelerated aging to determine specifications for shelf-life. In most cases, mechanical testing should examine the strength and elongation of the rubber or latex material at break to ensure that measured values fall within normal ranges of use. One of the main challenges with measuring elongation in medical gloves involves accurately measuring strain. Strain measurement can be difficult since traditional strain measurement devices risk damaging the material, causing unwanted failures at the attachment points.
When an extensometer is required, we recommend using one of our high-resolution video extensometers, such as the Standard Video Extensometer (SVE) or Advanced Video Extensometer (AVE). The SVE and AVE use a camera system designed to track specimen elongation via two dots made on the specimen's surface. This technology prevents premature failure in delicate materials, such as latex, due to the fact that there is no load on the specimen caused by knife edges. In cases where crosshead elongation measurement is suitable, we recommend pneumatic side action grips with line-contacting faces to ensure material extrusion from the grips does not occur.