Indentation hardness
Hardness measurements quantify the resistance of a material to plastic deformation. Indentation hardness tests compose the majority of processes used to determine material hardness, and can be divided into two classes: "microindentation" and "macroindentation" tests. Microindentation tests typically have forces less than . Hardness, however, cannot be considered to be a fundamental material property. Classical hardness testing usually creates a number which can be used to provide a relative idea of material properties. As such, hardness can only offer a comparative idea of the material's resistance to plastic deformation since different hardness techniques have different scales.
Paper and ink testing
% of moisure content in the paper is known as relative moisure content.High moisure content will increase the weight of the paper and increase the cost of paper. At the same time low moisure content will make the paper brittle and increases the chances of break in production.Roughness indicates varying degree of porosity of the paper. Porosity is a direct indication of paper to accept ink or water.