Thickness is a critical measurement of the uniformity of paper or board. Variations in thickness can affect several basic properties including strength, optical properties and roll hardness. The weight or substance per unit area is obviously fundamental in paper and paper board products. The Basis weight of paper is the weight per unit area. This can be expressed as the weight in grams per square metre (GSM or g/M2), pounds per 1000 sq. ft. or weight in kgs or pounds per ream (500 sheets) of a specific size. REAM WEIGHT is a common term to signify the weight of a lot or batch of paper. Control of basis weight is important as all other properties are affected. Variations in moisture content in paper affects the grammage.

These are pressure-sens