The principle and test method of anti static tester for safety shoes

test instrument

when applied (100 ± 2) The resistance can be measured to 0 ± The accuracy i2.5%< The inner electrode is composed of stainless steel beads with a total mass of 4kg and a diameter of 5mm. Measures shall be taken to prevent or remove oxidation of steel balls and copper plates, as oxidation may affect their electrical conductivity< The outer electrode is composed of a copper contact plate and cleaned with ethanol before use< The device for measuring the resistance of conductive coating is composed of three conductive metal probes with a radius of (3 ± 2) mm, mounted on a base plate. The distance between the two probes is (45 ± 2) Mm and connected by a metal band. The distance between the midpoint of the third probe and the other two probes is (180 ± 5) Mm and insulated from them sample preparation if the shoes are equipped with movable pads, they should be retained during the test. The sole surface was washed with ethanol to remove all traces of mold release agent, and then washed with distilled water at (23 ± 2) 1t is dry in the environment of. The sole surface should not be rubbed or worn, and should not be cleaned with organic materials that damage or expand the sole special preparation of wet conditioning for the sample adjusted under wet conditions, a layer with an area of 200 mm is applied on the sole × 50mm conductive coating covering heel and forefoot. The resistance of the coating is less than 1 × 103 megohm fill the shoe with clean steel balls and place them on the metal probe of the device, so that the forefoot area of the outer sole is supported by two probes with a distance of 45mm, and the heel area is supported by a third probe. Measure the resistance between the forefoot probe and the third probe with a test instrument according to the function of the tested shoes, adjust the prepared samples according to one of the following conditions 1) drying conditions, (20 ± 2) The relative humidity was (30 ℃) ± 5)%.((7 days) 2) wet condition, (20 days) ± 2) The relative humidity was (85 ± 5)%.(1f the test cannot be carried out in the regulated environment, it should be fully tested within 5 minutes after the sample is removed from the environment test steps fill the sample with clean steel balls with a total mass of 4kg. 1f necessary, a piece of insulating material can be used to increase the upper height. A sample filled with steel balls was placed on a copper plate and (100 ± 2) V DC test voltage for 1 minute and calculate the resistance value the energy consumption of safety shoes soles should not exceed 3W. 1f the voltage is reduced due to the limitation of 3W, the actual voltage value should be recorded in the test report China labor insurance net

Back to list