Significance and Use
DSC analysis may be used with fluoropolymers to achieve at least four different objectives as follows:
4.1.1 To measure transition temperatures to aid in the identification of the various fluoropolymers, individually or in mixtures;
4.1.2 To compare the relative levels of crystalline content of two or more specimens of a sample of a fluoropolymer relative to another sample by measuring the heat of fusion;
Note 2—Absolute values of crystalline content cannot be determined until values for heats of fusion of the completely crystalline polymers are available.
4.1.3 To characterize PTFE (DSC thermal curves determined on powders or products of PTFE that have never been melted convey appreciable information about details of morphology and molecular structure);4
4.1.4 To supplement the test for standard specific gravity (SSG) described in Specifications D 4894
1.1 This test method defines conditions for the use of differential scanning calorimetry (DSC) with fluoropolymers. It covers the use of DSC analyses with the fluoropolymers, PTFE, PVDF, PCTFE, and PVF and their copolymers PFA, MFA, FEP, ECTFE, EFEP, VDF/HFP, VDF/TFE/HFP, VDF/CTFE. The test method is applicable to the analysis of powders as well as samples taken from semi-finished or finished products. The nature of fluoropolymers is such that special procedures are needed for running DSC analysis and interpreting the results.
1.2 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
There is currently no ISO standard that duplicates this test method. ISO 12086-1 and ISO 12086-2 cover similar testing and reference this test method for testing conditions.
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