permeability number
permeability number
[‚pər·mē·ə′bil·əd·ē ‚nəm·bər] (engineering)
A numbered value assigned to molding materials indicating the relative ease of passage of gases through them.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
Procedure - The
permeability number, which has no units, is determined by the rate of flow of air, under standard pressure, through a 2 x 2-in.
Permeability can be measured with commercially available equipment and is usually specified as a
permeability number. The larger that number is, the higher its permeability.
In addition, Mercury Marine determined that these "precision" sands should have an AFS GFN of 25-33, with an AFS
permeability number of 450-500.
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