W501: Air Permeability and Burst Pressure
Here are the results for air permeability testing of W501. The sample closest to the origin had one very small (very difficult to see on Brian’s scope unless viewing at 100x) pinhole, the middle sample had 3 very small pinholes. The completely intact sample had a permeability of .773 cc/(cm^2*atm*s). It seems that the pinholes contributed most of the permeability to the other two samples, though their values are still very small. To confirm the small permeabilities were not due to leaks, I tested a solid piece of Si and observed stability for an hour.
I also tested the samples for burst pressure, as shown below.
