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It is made of glue-type insulating material, and there should be no harmful irregularities on the upper and lower surfaces of the insulating pad. Detrimental irregularities of insulating mats are the following characteristics**, i.e. defects that destroy the uniformity, damage the smooth contour of the surface, such as small holes, cracks, local bumps, cuts, inclusions of conductive foreign objects, creases, voids, bumps and castings logo etc. Harmless irregularities are surface irregularities formed during the production process.

More than 5 different points should be randomly selected for thickness measurement and inspection on the entire insulation board. Measurements can be made with a micrometer or an instrument of equal precision. The accuracy of the micrometer should be within 0.02mm, the diameter of the measuring drill should be 6mm, the diameter of the flat presser foot should be (3.17±0.25)mm, and the presser foot should be able to apply a pressure of (0.83±0.03) N. The insulating pad should be placed flat to avoid Makes micrometer measurements smooth between.