The absorbers are mainly made of plastic and the actual density is common to vary considerably over time due to the contraction phenomenon in the cooling process. In addition to the distance, radius, angle, shape and position differences, the seal surface is a particularly important measurement problem. Since the gap is 20 μm to 100 μm, the level of measurement inaccuracy required corresponds to the middle grade. The measurement time is a relatively secondary factor considering the object. To consider the density stability due to contraction, it is preferable to apply measurement or adjustment after stability rather than after the shape.
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