Permeability Articles:

Relationship Between Measurements of Air Permeability by Two Machines

In this paper is described the derivation of the empirical relationship between two commonly used instruments for determining air permeability—namely, the Frazier and Gurley machines. In addition, the limitations of each of the devices are discussed as well as the number of specimens necessary for testing. The correlation has also been determined by consideration of physical constants and pressure differentials, using the empirical data obtained on the Frazier and Gurley instruments operating at a pressure of 0.5 and 1.26 inches of water, respectively. The equations derived were log YF = log 533.0 — 1.02 log X G, based upon the empirical data alone, and log YF = log 507.5 — log XG when the physical constants of the machines were considered.

M.I. Landsberg - Technologist, Philadelphia Quartermaster Depot.

Gerald Winston - Statistician, Philadelphia Quartermaster Depot.

Textile Research Journal, Vol. 17, No. 4, 214-221 (1947)
DOI: 10.1177/004051754701700405