The permeance is determined as the gas transmission rate per pressure differential across

a specimen. The permeability is determined by multiplying permeance by the specimen

thickness.


Driving Force,PD
 I


Figure 4-1. Permeability experimental setup for manometric determination method.

 The monometric determination method was not considered for this study since it

is dangerous to handle the mercury compound which is considered as a health hazardous

material. Therefore, the permeability facility was constructed based on the volumetric

determination method as shown in Figure 4-1.