Made of stellene, mostly-an improved form of polyethylene-almost the same stuff as a weather balloon."
"The Planet Strappers"
Raymond Zinke Gallun
To achieve this, the jar was placed on a rabbit-wire support as described above, and housed in two cheap, clear polyethylene bags, such as used for vegetables in the United States.
"The BYU Solar Cooker/Cooler"
Steven E. Jones
That's why the threads have a ten-thousandth of an inch of soft polyethylene covering the hard steel, so that when the threads are tight, the polyethylene will act as a seal.
"Hanging by a Thread"
Gordon Randall Garrett