To evaluate the elastic modulus of PDMS, the pre-polymer solution was cross-linked inside a hollow cylindrical mould (capillary tube) with a circular cross-section to create rods with a diameter of 1.17 mm. These rods were subjected to a cantilever beam experiment, in which one end of a rod was secured to a rigid support and the deflection of the free end under gravity was observed. To estimate the modulus ( E ), slope of  tan vs. 3 l was obtained and was equated to the slope, 8