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European Standard EN344: 1997 "Specific Safety, Protective and Work Shoes" This European Standard was developed by CEN / TC 61 "Technical Committee of Foot and Leg Protection Products" and its secretariat is held by BSI. The standard labor protection shoes section design, the whole shoe, help surface, shoes, tongue, insole, outsole and other structural and performance specifications. The test methods stipulated in the standards are similar to other similar standards, and the principle of the method is generally applicable to most labor protection shoes. The main indicators are as follows:
(1) Baotou impact resistance
With a predetermined weight of steel impact hammer impact test, Baotou Baotou under impact when the gap height should be less than the specified value, Baotou in the direction of the test axis should not be any penetrating cracks. It is noteworthy that the national standards on the weight of the hammer, specifications, impact height and the structure of the test machine, etc. are different, the actual test should be distinguished.
(2) anti-piercing performance
The test machine is equipped with a pressure plate, the pressure plate is equipped with a test nail, the test nail is a truncated tip, and the hardness of the nail head should be greater than 60 HRC. The soles of the sample on the chassis of the testing machine, the location of the nail can be pierced through the outsole, the test nail to pierce the soles 10mm / min ± 3mm / min speed until the penetration of the record required maximum force. Each shoe selected 4 points on the test (of which at least 1 point in the heel), each point not less than 30mm, and from the bottom edge of the distance greater than 10mm. There are anti-slide block at the end, should be pierced between blocks. Two of the four points should be tested at a distance of 10-15 mm from the edge where the plantar is located. If the humidity will have an impact on the results, soak the soles in deionized water at 20 ° C ± 2 ° C for 16 ± 1h before testing.
(3) Conductive shoes and anti-static protective shoes electrical performance
After the shoe sample is conditioned in a dry and humid atmosphere, the clean steel ball is filled into a human shoe and placed on a metal probe device using the specified resistance tester to measure the distance between the first two probes and the third probe Between the resistance. Under normal circumstances, conductive shoes require resistance should not be greater than l00K ohm; anti-static work shoes require resistance should be 100K ohms to 100M ohms.
(4) thermal insulation properties
To shoes as a sample, the thermocouple installed in the inner connecting area at the center, and the ball into the shoe. Adjust the temperature of the sand bath to 150 ° C ± 5 ° C and place the shoe on it so that the sand comes into contact with the outsole of the shoe and use the temperature test device connected to the thermocouple to determine the temperature of the insole and the corresponding time , Gives the temperature increase curve. Calculate the temperature increase from 30 minutes after placing the sample in the sand bath. General insulation shoes in the bottom surface of the temperature increase is less than 22 ℃.
(5) Heel part of the energy absorption performance
The maximum compressive load of the test equipment 6000N, with a record of load / deformation characteristics of the device. The shoe with the shoe placed on a steel plate, the test punch in the heel part of the inner center of the inner bottom. Apply a load of 10 mm / min ± 3 mm / min. Draw the load / compression curve and calculate the absorbed energy, E, in Joules.
(6) The requirements of non-slip outsole
The standard specifies the test of non-slip coefficient of the sole, but the provisions of the design, specifications and other provisions of the slider, such as the thickness of the sole, the height of the slider, and the edge of the soles are required.