Gas permeability measurements for film envelope materials

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871541

Ludtka, Gerard M ^[1]; Kollie, Thomas G ^[1]; Watkin, David C ^[2]; Walton, David G ^[3]

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1. Oak Ridge, TN
2. Clinton, TN
3. Knoxville, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
• Patent Number(s): US 5750882
• OSTI ID: 871541
• Country of Publication: United States
• Language: English

Related Subjects

gas
permeability
measurements
film
envelope
materials
method
apparatus
measuring
polymer
super-insulation
powder-filled
evacuated
panels
peps
reduce
time
required
testing
weeks
months
involves
substitution
solid
non-outgassing
free
volume
25
total
powder
pep
control
body-filled
panel
pressure
versus
data
piece
permit
extrapolation
obtain
term
performance
candidate
permeability measurements
film materials
total volume
time required
polymer film
method involves
film material
free volume
method involve
gas permeability
powder-filled evacuated
pressure versus
/73/428/