AS 2210.2:2019 Personal protective equipment
5.2.4 Measurement of bond strength
Before carrying out the test, measure the width of the test piece to the nearest mm at several points using a calibrated steel rule and calculate the average value to the nearest mm. Then measure the bond strength on a minimum length of 30 mm in one of the following ways.
– For sole/upper bond strength (construction type a): clamp the test piece into the jaws of the tensile machine, using a pincer jaw to grip the short edge of the sole (see Figure 5), and record the load/deformation graph (see Figure 6) at a jaw separation speed of (100±20) mm/min.
– For sole/upper bond strength (construction types b, c, d and e) and sole interlayer bond strength [construction types fand g): clamp the separated ends of the test piece in the flat jaws and record the load/deformation graph (see Figure 6) at a jaw separation speed of (100±20) mm/min.
5.2.5 Calculation and expression of results
Determine, from the load/deformation graph, the average peeling load in newtons and divide by the average width (calculated in 5.2.4) to give the bond strength in N/mm.
5.3 Determination of internal toecap length
5.3.1 Preparation of test piece Carefully extract the toecaps from an untested pair of footwear and remove all foreign materials adhering to them, or take a new pair of identical toecaps.
NOTE Preconditioning of the test piece is unnecessary.
5.3.2 Determination of the test axis
Position the left toecap with its rear edge in line with a base line and draw its outline. Repeat the exercise with the right toecap of the pair. Position the outlines in such a manner that the outlines at both the toe end of the toecaps and the base lines coincide (see Figure 7).
5.3.3 Test procedure
Place the toecap, open side down, on a flat surface. Using an appropriate gauge, measure the internal length, I, along the test axis from the toe to the back edge at a distance between 3 mm and 10 mm above and parallel to the surface upon which the toecap rests (see Figure 8). I is the maximum length which can be measured.