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ISO 7258:1984 Polytetrafluoroethylene (PTFE) tubing for aerospace applications - Methods for the determination of the density and relative density
standard by International Organization for Standardization, 06/01/1984
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Specifies three methods: Method A - density gradient column method without a preconditioning heating and cooling cycle; method B - displacement of water and determination of change of weight method; method C - density gradient column method with a preconditioning heating and cooling cycle.