Safety shoes are shoes and protective safety class class shoes collectively , but also a labor supplies . Protect feet and legs from foreseeable harm footwear.
PPE European standard EN344: 1997 " special security , protection , and work shoes ."
The standard safety shoes models design, the entire shoe uppers, shoe , tongue , insole , outsole and other structures and performance indicators were provided . Each item specified in the standard test methods and other similar standards similar to its principle of the method is also generally applicable to most safety shoes , the main indicators are:
a. Baotou impact resistance steel with a prescribed weight impact test hammer , Baotou Baotou upon impact should be less than the clearance height of the specified value , and Baotou in the axial direction of the test should be no penetrating cracks. It is noteworthy that the national standards of the hammer weight , size , height and impact testing machine structure different from the requirements such as the actual test should be distinguished.
b. puncture resistance test machine is equipped with a plate, nail plate is equipped with a test , the test is a truncated tip of the nail head , nail head should be greater than the hardness of 60HRC. The sole sample is placed on the test machine 's chassis , the position can test for nail piercing through the outsole , the test nails to pierce the speed 10mm/min ± 3mm/min soles until penetrate far, record the maximum required force . Each four points selected on the sole test ( of which at least one point of the heel ) , each point distance of not less than 30mm, and the distance from the inner bottom edge than 10mm. A non-slip bottom block , between the blocks should be pierced. 4 points in the two points should be located away from the implant bottom corner edge line distance of 10-15mm for testing. If the humidity will affect the results , soles should be soaked before testing plus 20 ℃ ± 2 ℃ deionized water 16 ± 1h.
c. conductive anti-static shoes, shoes and fireproof shoes like electrical performance through in the dry and wet atmospheric adjustment , will be filled with people clean the ball and put it inside the shoe metal probe device, using a predetermined resistance testing instruments, measuring the first two probe between probe and the third resistor. Under normal circumstances, conductive shoes required resistance should not exceed l00K ohms ; Anti-static shoes should be required 100K ohm resistor to 100M ohms.
d. insulation performance with a shoe as a sample , the inner end of the thermocouple installed at the center of the connection area , and the person filling ball shoes . Adjusting the temperature of the sand bath pot to 150 ℃ disabilities 5 ℃, the shoe placed thereon , so that the sand contacts the shoe outsole , with the temperature of the thermocouple connected to the testing apparatus , measuring the temperature inside the end of the corresponding time , given the increase in the temperature curve . Calculated from the sample placed on a sand bath after 30min from the increase in temperature . General requirements insulated shoes inner bottom surface temperature increase is less than 22 ℃.
e. heel portion of the energy absorption performance test instrument's maximum compression load 6000N, with a record load / deformation characteristics of the device. The shoe will take place with a steel plate , the test punch in the center portion of the inside of the heel against the inner sole . 3mm/min with disabilities speed 10mm/min load is applied . Draw the load / compression curve and calculate the absorbed energy E, expressed in joules .
f. slip outsole for the standard specifies requirements for non-slip soles coefficient test , but the skid block designs, specifications , etc. made ??provisions, such as the thickness of the sole , skid block height , the distance between the edge of the sole , etc. are required .