• Prepare the test piece:
  1. Determination of the position of the test piece: Select the test piece from the dispersed position of the same batch of materials.
  2. Test piece production: Cut the test piece into two pieces of standard disc core test piece with a thickness of 12.5mm and a diameter of 28mm.
• Operation steps:
  1. Confirmation before operation:
     1. Check if the machine is level. If the machine is not in the horizontal state, adjust the machine to the level through the adjustable feet.
     2. Confirm that the slider is vertical.
  2. Clamp the test piece: Loosen the fixing screw of the machine stand and move the test piece up to the position where the rubber test piece can be placed. After pressing the rubber, lock the fixing screw.
• Start the test:
  1. Move the hammer along the slide bar to the highest point, use the trigger to fix the hammer.
  2. Press the lever, the hammer will naturally fall to the test piece along the slide bar and the height will be the rubber rebound height.

Note:

• The same test piece is tested six times, the first three times are predicted first, no need to record the value, and then the adjustment handle is locked.
• After predicting three times, test again three times and record the rebound heights h1, h2, h3.
• Only when the test piece is clamped, the test can be carried out, otherwise the hammer and the base will be damaged.
• Recording method: The bounce height is read from the scale.

Note:

• When reading, the line of sight should be perpendicular to the scale to avoid errors in the test results.
• When reading a value, generally retain 1 decimal place, and the second digit is rounded.
• The scale next to the slide bar of the machine, each scale is 4mm.
• Results Processing Take the average of the first three test results

Rubber Rebound Height (W)= (h1 + h2 + h3)/3

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