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How to test the hardness of pearl cotton?

Source: shengpingda technology, release time: May 16, 2018, hits: 1249

Pearl cotton is a kind of packaging material commonly used in packaging industry. Pearl cotton can be used as packaging material, sound insulation material, floating water material and so on. But for different occasions, the hardness requirements of pearl cotton are different. How do we test the hardness of pearl cotton?

 Anti-static EPE

Hardness is the ability of a material to resist hard objects pressing into its surface. It is one of the important properties of materials. Generally, the higher the hardness, the better the wear resistance. The common hardness indexes are Brinell hardness, Rockwell hardness and Vickers hardness.

1. Brinell hardness (HB)

The hardened steel ball with a certain size (generally diameter of 10 mm) is pressed into the surface of the material with a certain load (generally 3000kg). After the load is removed, the ratio of the load to the indentation area is the Brinell hardness value (HB), and the unit is kgf / mm2 (n / mm2).

Rockwell hardness (2

When HB > 450 or the sample is too small, Brinell hardness test can not be used, but Rockwell hardness measurement is used. A diamond cone with a top angle of 120 ° or a steel ball with a diameter of 1.59 and 3.18 mm is pressed into the surface of the tested material under a certain load, and the hardness of the material is calculated from the depth of the indentation. According to the hardness of different materials

HRA: it is the hardness obtained by using 60kg load and diamond cone indenter. It is used for materials with high hardness (such as cemented carbide, etc.).

HRB: hardness obtained by using 100kg load and 1.58mm diameter hardened steel ball is used for materials with lower hardness (such as annealed steel, cast iron, etc.).

HRC: it is the hardness obtained by using 150kg load and diamond cone indenter. It is used for materials with high hardness (such as quenched steel).

3 Vickers hardness (HV)

A diamond square cone indenter with a load of less than 120kg and a top angle of 136 ° is pressed into the material surface. The Vickers hardness HV value (kgf / mm2) is obtained by dividing the surface product of indentation pits into the load value.

The above is about the pearl cotton hardness test method. For example, when we make the pearl cotton into coiled material, the pearl cotton needs to be soft at this time, because the sheet material is mainly used to wrap some articles, but if it is used as some floating water sticks, we need to make it harder and have higher density.


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