SYMPOSIA PAPER Published: 01 January 2000

The Relationship Between Porosity and Barrier Effectiveness of Some Shell Fabrics Used in Protective Apparel


The porosity of twenty-two fabric samples was evaluated using image analysis. The relationship between the optical porosity and vapor penetration was investigated using a permeation test apparatus. A model was derived based on Whelan's equation for the resistance of fabric to diffusion of vapor, and the model was fit to the penetration data. The model fit the data fairly well, and may be used for some fabrics to predict the amount of vapor penetration under a null pressure gradient.

Author Information

McCord, MG
North Carolina State University, Raleigh, NC
Birla, K
Vijay Chemical Industries, Thane, INDIA
Barker, RL
North Carolina State University, Raleigh, NC
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Developed by Committee: F23
Pages: 297–311
DOI: 10.1520/STP14453S
ISBN-EB: 978-0-8031-5434-6
ISBN-13: 978-0-8031-2869-9