BS ISO 19935-2:2020 pdf free.Plastics一 Temperature modulated DSC.Measurement of specific heat capacity Cp.
BS ISO 19935-2 This document establishes a method for measurement of specific heat capacity, Cp, using temperature modulated differential scanning calorimetry.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 472, Plastics一Vocabulary ISO 11357-1, Plastics一Differential scanning calorimetry (DSC)一Part 1: General principles ISO 19935-1, Plastics一Temperature modulated DSC一Part 1: General principles ISO 80000-5, Quantities and units一Part 5: Thermodynamics.The procedures of temperature modulated DSC (setting up the apparatus, loading the specimen into the crucibles, insertion of crucibles into the instrument, performing measurements, and removal of crucibles) shall be in accordance with ISO 11357-1. The experimental conditions specified for temperature modulated DSC (for example, amplitude of the modulated heat flow rate, amplitude of modulated temperature, and the frequency of the modulation mposed on the underlying rate) to be used depend on the magnitude of the specific heat capacity to be determined.Figure 1 shows a typical example of modulated temperature and scanning rate (of modulation) derived by a derivative of modulated temperature of a sinusoidal waveform for the heat flux DSC plotted vs time. The scanning rate of modulation is measured as a sinusoidal wave.The test report shall include the following information:  a] a reference to this document, i.e. ISO 19935-2:2020;b] type and complete identification of specimen; c) type (heat flux or power compensated), manufacturer and model of DSC instrument used; d) material, type and mass of crucible used; e) type, purity and heat flow rate of purge gas used; f) type of calibration procedure (simplified or extended), calibration materials used, including source,  mass and other properties important for calibration; g) details of sampling, preparation of specimen and conditioning procedures, if applicable; h) shape and dimensions of specimen, if applicable; i) mass of specimen;  j) thermal histories of sample and specimen; k) temperature program parameters, including time and temperature of isothermal steps and rate of dynamic steps, frequency, amplitude and waveform of the modulation; 1) change of mass of specimen over duration of test, if any; m) test results including DSC curves and the specific heat capacity; n) date of test;   o] any additional information or operating details not specified in this document which may be important for assessment of the results. BS ISO 19935-2 pdf download.