NASA NTRS · 19660000327
Cork is used to make tooling patterns and molds
Abstract
Sheet and waste cork are cemented together to provide a tooling pattern or mold. The cork form withstands moderately high temperatures under vacuum or pressure with minimum expansion, shrinkage, or distortion.
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Hoffman, F. J.. 1965-11-01. Cork is used to make tooling patterns and molds. https://ntrs.nasa.gov/citations/19660000327
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