How is the degradation measured?
Method: * A patch is cut from the glove and attached to the top of a beaker containing the chemical under test. * The beaker is turned upside down; the glove comes into contact with the product. * After one hour of contact, the beaker is returned to its original position and a puncture test is immediately conducted using a needle as per standard EN 388. Result: This test enables measurement of the time (in minutes) taken by the chemical to break through the glove, in conditions equivalent to total immersion of the glove. The test is conducted at 30°C in order to simulate the hand’s temperature. The test lasts a maximum of 8 hours. If no permeation occurs, > 480 minutes is indicated as the result. In accordance with standard EN 374, the breakthrough time is represented in a permeation index as per the following table : Residual force (in Newton ) <5 5 to 10 11 to 15 >15 Degradation index 1 2 3 4 The glove with the highest index is most resistant to degradation.
