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A 5544 universal testing system configured with side action screw
grips and 25.4 mm x 50.8 mm (1 in x 2 in) rubber coated faces can be used for
evaluating the tensile strength of medical gloves.
The Challenge
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 as
well as international standards (ASTM D 6319-00ae3, ASTM D 5250-00e4, EN 455-2,
ISO 11193-1:2002, ISO/AWI 11193-2). The aging effects of the material must be
evaluated to ensure that cross-contamination of the examiner and the patient
does not occur. Testing should examine the strength and elongation of the
material at break to ensure that measured values fall within normal ranges of
use. The main testing difficulty usually involves measuring strain, since
traditional strain measurement devices risk damaging the material and causing
unwanted failures at the attachment points.
Our Solution
Instron's pneumatic grips are ideal for gripping delicate materials without
tearing or causing slippage. The grips allow for adjustable gripping pressure
and a choice of face dimensions and surfaces, such as rubber-coated, serrated,
wave-profile or flat metallic. Instron's high resolution, non-contacting video
extensometer provides accurate strain measurement without damaging the
specimen. By attaching two small markers to the sample, the video extensometer
precisely measures elongation without extraneous loads or knife-edges to
distort the results. The video extensometer and pneumatic grips are readily
adapted to any of Instron's universal testing systems, which are engineered for
precise control and accurate alignment.
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