Application:

Many medical products are made of latex, rubber or silicone, the elastic properties of these materials being useful in this field, while their non-toxicity especially that of natural latex, plays an important role in medicine and hygiene in excluding germs.

Tensile Test on Rubber Gloves

post77Single-use medical gloves provide protection in operations, exami- nations and caring activities. The most important requirement is preventing the entry of air, fluids and micro-organisms. Manufacture in- volves immersing molds in solutions of natural rubber or latex mixtures.

The number of immersion and drying processes is repeated until the required thickness is achieved, after which the gloves are vulcanized in curing ovens.

So that they do not tear when being pulled on in use, the gloves must display sufficiently elastic behavior.

Examples of stresses to which they are subjected include hooking on or holding pointed or sharp tools, for-eign bodies or instruments. Methods used to guarantee the required operational reliability, include the following mechanical tests. Tear-strength tests are performed on gloves with and without a seam, as well as on artificially aged gloves. zwicki-Line or ProLine testing ma- chines are also used for this and testing takes place to ISO 37 and ASTM D412. Three shouldered test bars are punched out of the palm, back and cuff of the random sample glove, parallel to the longitudinal axis and avoiding structured areas.

Tensile Test on Condoms

post78zwicki-Line table-top testing ma- chines are suitable for determining the tear strength and strain at tear of condoms. The required force measurement range as specified in the standard lies between 0 – 200 N and the load cell suitable for this has a nominal force of 200 N (measuring range from 2 N in Class 1 to DIN EN 10002-2). The crosshead speed is 500±50 mm/min.

Flanged rollers, arranged horizontally and mounted at one end only, are used to hold the specimens. One of these rollers is driven via a toothed belt proportionally to the crosshead movement, loading the condom specimen uniformly over its entire circumference. If the rollers were fixed or not driven, frictional forces would act in addition to the tensile mforce and the specimen could be unacceptably loaded and pre-damaged.

A thickness-measuring device can be connected via the serial port of the PC, so that these measured values are automatically input into the test as well.