Impact resistance of toe cap
The impact test is carried out with a steel impact hammer of specified weight. When the toe cap is impacted, the gap height under the toe cap should be less than the specified value, and no penetrating cracks should appear on the toe cap in the direction of the test axis. It is worth noting that the weight, specifications, impact height and structure of the impact hammer in the standards of various countries are different, and they should be distinguished in actual testing.
Puncture resistance
The test machine is equipped with a pressure plate, on which a test nail is installed. The test nail is a head with a truncated tip, and the hardness of the nail head should be greater than 60HRC. Place the sole sample on the chassis of the test machine, and the position allows the test nail to pierce through the outsole. The test nail pierces the sole at a speed of 10 mm/min ± 3 mm/min until it penetrates, and the maximum force required is recorded. Select 4 points on each sole for testing (at least 1 of which is on the heel), and the distance between each point is not less than 30 mm, and the distance from the edge of the inner sole is greater than 10 mm. For the bottom with anti-slipper, piercing should be carried out between the blocks. Two of the four points should be tested within a distance of 10-15 mm from the edge line of the planted bottom ridge. If humidity affects the results, the soles should be immersed in deionized water at 20℃±2℃ for 16±1h before testing.
Electrical properties of conductive shoes and anti-static shoes
After the shoe samples are conditioned in dry and wet atmospheres, clean steel balls are filled into the shoes and placed on the metal probe device. The resistance between the first two probes and the third probe is measured using the specified resistance test instrument. In general, the resistance of conductive shoes should not be greater than 100K ohms; the resistance of anti-static shoes should be between 100K ohms and 1000M ohms.