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In this project we target a desired viscoelastic properties of PDMS for the application of thin wall membrane uses as a container to support soft test sample biomaterials during mechanical compression tests. The biocompatible PDMS membrane is produced by a custom made PDMS seal. This axisymmetric chamber is made by reaction injection molding. In this project student should synthesize different PDMS by changing some parameters and polymerization process and do some standard mechanical tests on them using INSTRON machine to optimize the viscoelastic properties of produced material to reach to the best composition with less viscosity modulus good stiffness and as thin as possible membrane.