Eight versions of CNT-sheets were characterized in order to investigate the dependence of the tensile performance data (tensile strength, Young's modulus and failure strain) on physical parameters (volumetric density and areal density) and manufacturing parameters (nominal or enhanced production method, and/or acid treated). The morphology and microstructure of CNT-sheets were also studied. An enhanced (faster) production method without any post-processing acid treatment reduces tensile strength and stiffness relative to those produced by the nominal production method due to increase of impurities in the CNT-sheet as well as due to less compactness of layers in the sheet. The acid treatment improves tensile strength and stiffness due to reduced impurities and better consolidation of layers. Increase in areal density of the CNT-sheet does not increase its tensile strength and stiffness but increase in volumetric density improves tensile strength and stiffness in CNT-sheets if impurities are not increased. However, failure strain increases with increasing either volumetric or areal density indicating it depends directly upon the amount of CNTs.