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permeability number

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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.
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It should be noted that the motivation of this modeling was not to provide quantitative results matching observed permeability numbers, but rather to explain the general trend seen with these materials.
Mixed matrix membrane materials with glassy polymers. Part 1 by Mahajan, Rajiv; Koros, William J. / Polymer Engineering and Science
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.
Understanding the basics of green sand testing by Granlund, Matt J. / Modern Casting
In an equation form, it is: (Volume of Air)*(Height of Specimen)/(Area)*(Time)*(Pressure) Permeability can be measured with commercially available equipment and is usually specified as a permeability number.
Mold venting: a return to the basics by Scheil, Steve / Modern Casting
 
 
 
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