Samples polished grit paper the final of 1200, and then polished the diamond pastes (powder with a diameter of 6, 3 and 1 micron). The samples to be further polished for microscopic examination using a colloidal silica having a particle size 0.06 microns, and then digested with the alcohol solution consisting of 10 ml of acetic acid + 10 ml water + 70 ml of a 4% solution of picric acid in ethanol. For samples destined for final polishing micro-hardness measurements were carried out on the diamond grit paste 0.25 microns. Photos morphology of the samples was performed on an optical microscope Leica DMIRM. The measurements were made using Knoop hardness with a load of 0.1 kg at 2500 Tukon hardness tester using the guidelines of ISO 4545. Two series of measurements were made covering the entire wall thickness (in the direction of TD). For one of them, the longer diagonal footprint was always parallel and the other perpendicular to the RD.