In this experiment, it was found that the percentage of shrinkage values for natural rubber (NR), hardness 60 shore and shore 50 EA. The more extreme hardness is shrinking a little contrast to the strength of each contraction, and the size of the pieces, it is not the same shrinkage depends on the length of the contraction, if very long over, and the safety margin of the humidity it must use appropriate safety margin to each shape and size.
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