The segment quality can be judged by the following things:
1.the hardness.The hardness should be in proper range,depends on the material.
2.the size.the size deviation is the reflect of the quality.In good production methods, the deviation will be no more than 0.1mm.
3.the density and weight.The density is the reflect of the quality,too.Usually the the minmum density =the weight /the volume*95%.
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