Three test pieces are cut from various positions of the material with a diameter of about 16 mm with a + or – 0.2 mm allowance and thickness of about 6.0 – 10 mm using a tubular drill.

The piece of test specimen must be parallel to the bottom and top. The round of flank must be vertical to either side, which is in the column’s shape.

Note: if the test piece thickness is less than 6.0 mm, another rubber test piece with a hardness of 65 HA must be taken in a similar way, and sticks to the test piece using universal glue. This is to guarantee the thickness of a minimum of 6 mm.

The number of test pieces must be at least 3 pieces taken from each type of material. Instrumental correction: After testing for 10 times, the instrument must be corrected using a standard rubber. It should be done in accordance to the following:

First, a standard rubber must be tested for three times. Its mean is indicated as S. The results are correct when the standard rubber wear mean is around 200 + or – 20 mg. If the results read more than 220 mg, it means that the sandpaper is too sharp and it needs to be readjusted.

Put the iron of the same size as the test specimen, then rub the rubber until it becomes less than 220 mg in size. If it achieves a size of under 180 mg after wearing, the sandpaper needs to be replaced because apparently, it is a bit too blunt.

Note: if the wears in the test piece have a variance of over 15 mg, then the specimen must be abandoned, and retesting must be done.