Durable Hardness Testing Machine Plastic Hardness Testing Machine For Plastic Ball

A.  Features:

1. This instrument adopts micro-processing control and integrated and digital measurement and control technology. Procedural setting according to the standard test procedure.
2.  Chinese color crystal display, touch screen operation, easy to understand.
3. It adopts digital display dial indicator, high-precision force value measurement system, high measurement and control
precision and stable control.
4. Micro-printer for data printing.
5. The instrument is upgraded to touch screen control, which is novel, convenient and easy to operate, and more humanized.
6.Using a large-size 65535 true color screen, the visual effect is better, and the interface displays more information.
7. Improve the calculation function of the test results, keep decimals, and round the results to make the calculation results more accurate.
8.Various parameter settings can be set arbitrarily, which is more convenient for the testers to operate flexibly and meet
more test requirements
9. Any step in the test can be skipped manually, which is convenient for testing

B.  Hardness test method:

The plastic ball indentation hardness test is to use a steel ball with a specified diameter to press vertically into the surface of the sample under the action of the test load, and keep it for a certain period of time.Then read the indentation depth value. Obtain its hardness value by calculation or look-up table.
1.The thickness of the sample is not less than 4mm, the adjustable range of loading speed is within 2-7 seconds, usually 4-6 seconds, and the loading time is 30 seconds or 60 seconds; The load size should be selected according to the expected hardness of the sample. If the hardness is higher, a larger load can be selected; otherwise, a smaller load should be selected. if unpredictable The hardness of the sample must be gradually upgraded from a small load, so as not to damage the steel ball indenter and the sample; The test can be carried out by selecting the load.
2.Ball indentation hardness means that a steel ball with a specified diameter is vertically pressed into the surface of the sample under the action of the test load and kept for a certain period of time. Finally, the average pressure per unit area is expressed in Kgf/mm2 or N/mm2.
Its expression is: H=0.21p/0.25πD (h-0.04) (kg/mm2)
P—load (kg)
h—indentation depth (mm)
D—Steel ball diameter (mm)
π - pi
Note: h=h1-h2
h1: Indentation depth of sample load (mm);
h2: The frame deformation of the instrument under the test load (mm)
3.The distance between the center of the measurement point and the edge of the sample is not less than 10mm, and the distance
between the centers of two adjacent measurement points is not less than 10mm

C.Main purpose and function:

Plastic hardness refers to the ability of a plastic material to resist being pressed into it by another rigid object that is
regarded as not elastically and plastically deformed. The plastic ball indentation hardness test is to use a steel ball with a
specified diameter to press vertically into the surface of the sample under the action of the test load, and read the indentation depth after a certain period of time. Obtain its hardness value by calculation or look-up table.
 

Applicable standards:

   * GB/T3398.1-2008
   Plastics - Determination of hardness - Part 1 Pressure ball method
   * ISO 2039-1-2001
    Plastic - Determination of hardness by ball pressure
   * JJG884-1994
    Plastic Rockwell Hardness Tester Verification Regulations
   * JJG369
      Plastic ball indentation hardness tester inspection rules