Tips: Some International Standards on Safety Shoes

Safety shoes are collectively referred to as safety footwear and protective footwear, and generally refer to footwear worn in different workplaces to protect the feet and legs from foreseeable injuries. Safety shoes are high-tech and high value-added footwear products. The production process of safety shoes is very demanding on raw materials, auxiliary materials, chemical materials, and mechanical equipment. At present, many shoes with a certain scale and grade are produced in China. The company has turned its sights on safety footwear, a market area that was previously occupied by developed countries. Xiao Bian collected some international standards concerning safety shoes. I believe interested friends will like it.

1. European Standard "Special Safety, Protection and Work Shoes"

The European Standard was developed by CEN/TC61 "Protective Products for Feet and Legs" and its secretariat is BSI.

The standard specifies the structural design and performance indicators of the safety footwear, such as the pattern design, the entire shoe, the upper, the shoe, the tongue, the insole, and the outsole. The test methods of each item specified in the standard are similar to other similar standards. The method principles are also generally applicable to most safety shoes. The main indicators are:

a. Impact resistance of the toe cap The impact test is carried out with a steel hammer of a specified weight. The height of the gap under the toe cap should be less than the specified value when the toe cap is impacted, and there should not be any penetrating cracks in the direction of the test axis of the tow cap. It is worth noting that the specifications of impact hammers in different countries are different in terms of their weight, specifications, impact height, and the structure of the tester. Actual tests should be differentiated.

b. Anti-piercing performance test machine is equipped with a pressure plate, and the pressure plate is equipped with a test nail. The test nail is a truncated tip. The hardness of the nail head should be greater than 60HRC. The shoe sole sample is placed on the chassis of the tester in such a way that the test nail can be pierced through the outsole, and the test nail pierces the sole at a speed until it penetrates, recording the maximum force required. Select 4 points on each sole for testing (at least 1 point in the heel), each point is not less than 30mm apart, and the distance from the inner bottom edge is greater than 10mm. The bottom of the anti-slip block should be pierced between the blocks. Two of the four points should be tested at a distance of 10-15 mm from the edge line of the planting floor. If humidity affects the results, the sole should be immersed in deionized water at 20 °C ± 2 °C for 16 ± 1 h before testing.

c. The electrical properties of conductive shoes and anti-static shoes are adjusted in a dry and wet atmosphere. The clean steel ball is filled into the human shoe and put on the metal probe device. The specified resistance test equipment is used to measure the front two The resistance between the probe and the third probe. Under normal circumstances, conductive shoes require resistance should not be greater than lOOK ohms; anti-static shoes require resistance should be between 100K ohms and 100M ohms.

d. Insulation performance Using the shoe as a sample, the thermocouple is fitted in the center of the connection area of ​​the inner bottom and the steel ball is filled into the shoe. Adjust the temperature of the sand bath to 150°C and 5°C. Place the shoe on it so that the sand touches the outer sole of the shoe. Use a temperature tester connected to the thermocouple to measure the temperature of the inner sole and the corresponding time. , gives the temperature increase curve. Calculate the temperature increase from 30 minutes after the sample is placed on the sand bath. General insulation shoes require that the temperature increase of the inner bottom surface is less than 22°C.

e. Energy Absorption Performance of the Heel Part The test equipment has a maximum compression load of 6000N and is equipped with a device for recording load/deformation characteristics. Place the heel-like shoe on a steel plate, and place the test punch against the inner bottom on the inner side of the heel portion. The load is applied at a speed. Plot the load/compression curve and calculate the absorbed energy, E, in joules.

f. Requirements for non-slip outsole This standard specifies the test for non-slip coefficient of shoe soles, but specifies the design and specifications of the nonslip piece, such as the thickness of the sole, the height of the non-slip piece, and the distance from the edge of the sole.

2. Standard: EN345-1, US ANSI-Z41, China An1