Step:
On a hard flat surface, use the sample, hardness meter, reduce the distance between the needle and sample, press 12mm from the end, apply smooth pressure on the inner foot of the sample and make the foot fully contact with the inner sample. Add vertical pressure to the sample for 1 second. Measure the hardness value of different places with a hardness of more than 6mm 5 times and get the average value (micro-porous material is more than 15mm) In order to stabilize the determination condition and improve the accuracy of the decision, the hardness tester must be made the same judgment with the assumption of supporting the manufacturer.