1. Performance Introduction
The sponge hardness tester is specially customized by the factory for the convenience of customers to measure the hardness of the foam material. It is suitable for measuring the hardness of soft foam materials and polyurethane foam rubber products. This hardness tester and other hardness testers have The difference is that when in use, the presser foot directly contacts the sample and uses its own weight as the load for measurement.
2. Main performance parameters
Stroke range of pressing needle: 0 ~ 2.5mm;
Dial value: 0 ~ 100 degrees;
End force of pressing needle: 550mN ~ 4300mN (56 ~ 438.5g).
3. How to use:
Holding the middle part of the instrument, place the hardness tester gently on the flat sample (or test piece) larger than the presser foot. When the hardness tester and the sample are in stable contact, the reading will be made within 1 second. It is the hardness value of the test sample (test piece). In order to improve the measurement accuracy, the sample should be placed on a flat glass or flat plate, each measurement point should only be measured once, and the measurement points of different parts on the same sample separated by more than 25mm should be no less than 5 points. The average value of the measurement results is the hardness value of the sample material.
4. Matters needing attention
When the pressure foot of the hardness tester is in a free state, the pointer shows “0”, the end surface of the presser pin is in close contact with the plane of the presser foot, and the pointer display should be “100”. If the hardness tester pointer cannot display “0” and “100” during inspection, it can be used only when it is adjusted to “0” and “100”.
5. Sample and adjustment
(1) The thickness of the sample should be between 25mm and 30mm: when the thickness is less than 25mm, two pieces can be stacked, but the contact surface must be smooth and flat, and the total thickness should still meet the thickness of the sample.
(2) The size of the sample should be greater than 100mm in length and width, the distance between the measuring point and the edge of the sample should not be less than 40mm, the distance between each measuring point should not be less than 25mm, and the measuring point of each sample should be no less than 5 points.
(3) Remove the skin on both sides of the sample, the thickness should be uniform, the surface is smooth, the pores are evenly distributed, and there is no mechanical damage and impurities.
(4) The sample adjustment and test environmental conditions shall be carried out in accordance with GB / T2941-91.
(5) After using the hardness tester, put it into the instrument box and place it in a dry place to prevent moisture.
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