Doctoral thesis, this project is intended to study the value of percent contraction, and the safety margin in mould design of natural rubber products. A major problem encountered in the use of molded rubber products rubber products is shrinking in size does not match the pattern that has been designed, which we see in our students the importance of the project, thus creating a mold silicone rubber. In order to make the research and experimentation by consulting a specialist teacher directly. A study of the theory used in the design and the process of creating a mold silicone rubber. Study on the design of rubber products The basic theory in the design of rubber mold products. Conditions to consider about creating mold silicone rubber The use of a computer program in the industry (CAD/CAE/CAM) the properties of rubber and statistical information. 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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