Gas permeability measurements for film envelope materials

Details Gas permeability measurements for film envelope materials Gas permeability measurements for film envelope materials

1997-04-04

1998-05-12

Williams, Hezron E.

Measuring and testing

With fluid pressure

Porosity or permeability

428 69, G01N 1508

Patent

active

057508828

ABSTRACT:
Method and apparatus for measuring the permeability of polymer film materials such as used in super-insulation powder-filled evacuated panels (PEPs) reduce the time required for testing from several years to weeks or months. The method involves substitution of a solid non-outgassing body having a free volume of between 0% and 25% of its total volume for the usual powder in the PEP to control the free volume of the "body-filled panel". Pressure versus time data for the test piece permit extrapolation to obtain long term performance of the candidate materials.

REFERENCES:
patent: 4213327 (1980-07-01), Prescott et al.
patent: 4668551 (1987-05-01), Kawasaki et al.
patent: 5157960 (1992-10-01), Brehm et al.
patent: 5513515 (1996-05-01), Mayer
patent: 5591898 (1997-01-01), Mayer

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