Shandong Gaomi Lianchi protective products introduces the heat resistance of safety shoe leather

      The ability of safety shoes to be subject to the extremes of normal temperature encountered in the shoemaking process is important to avoid excessive damage. Especially for directly vulcanized (DV molded) workpieces, a temperature of 180-200 degrees Celsius is normal, plus the pressure around the edge of the bottom mold when it is closed on the upper. This leads to so-called undercut failure. The thickness of the upper (not just the leather mentioned earlier, but also the stitching from the upper to the edge) is also important.

      A test to evaluate heat resistance by imitating undercut failure, and then conducting a tensile strength test and a 180-degree bending test.

Although the shrinkage temperature is sometimes measured, the temperature is not always related to DV molding, because modern Far East production uses fewer high temperatures. For example, during heat setting, the shrinkage temperature below 100 degrees Celsius may be as low as 90 degrees Celsius proved to be sufficient. For professional footwear, such as fire safety shoes, the ability of leather to withstand thermal contact, thermal radiation and burning is very important.