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Air Permeability and Porosity: Glossary and Fact Sheet Air permeability (porosity): The rate at which air passes through a sheet of paper or board, reflecting the openness of its internal fiber structure. Gurley seconds: The unit of result from the Gurley porosity method: the time, in seconds, for a fixed volume of air to pass…

Paper and board manufacturers need to know how porous their sheet is at two different points: while it is being made, and after it is made. This piece explains both approaches, why they matter together, and how the results relate to each other. Overview Porosity describes how open or closed the internal fiber structure of…

Understanding Air Permeability (Porosity) in Paper and Board Air permeability, also called porosity, is the measure of how readily air passes through a sheet of paper or board. It is used across paper and board production to monitor and control the internal structure of the sheet as it is made. Porosity affects printability, coating holdout,…

You think you’ve picked the perfect packaging to protect your precious products...then you encounter an oxygen permeation problem. A problem that can lead to product recalls, expense, wasted time, and reputational damage. Knowledge of oxygen transmission rates is important - particularly if you’re a food producer that packages goods in a modified atmosphere. In this…

You think you’ve picked the perfect packaging to protect your precious products…then you encounter an oxygen permeation problem. An issue that can lead to product recalls, expense, wasted time, and reputational damage.  Knowledge of oxygen permeability is important because it determines the oxygen transmission rate (OTR) of a package. This is the amount of oxygen…

Why is water vapor permeation testing important? And how do permeation testing instruments help you? Let’s start with the first question...in fact, there are several reasons, depending on what you make and how you make it. We can take a look at an obvious one - food packaging. Nobody wants a soggy, stale potato chip,…