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Gurley Type Products Paper Testing Instruments Surface Roughness Smoothness Tester Gurley Type
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|  Air resistance is the resistance to the passage of air, offered by the paper structure, when a pressure difference exists across the boundaries of the specimen. It is quantified by obtaining the time for a given volume of air to flow.
Densometer is a standard instrument for measuring porosity, air permeability or air resistance of paper and paper products by determining the time necessary for a certain volume of air to flow through the inserted sample, under a uniform light pressure.
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