ASTM E967-2018 pdf free download

ASTM E967-2018 pdf free download.Standard Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
1. Scope
1.1 This test method describes the temperature calibration of differential thermal analyzers and differential scanning calorimeters over the temperature range from −40°C to +2000°C. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This test method is similar to ISO standard 11357–1. 1.4 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 appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 This test method consists of heating the calibration materials at a controlled rate in a controlled atmosphere through a region of known thermal transition. The heat flow into the calibration material or the difference of temperature between the calibration material and a reference sample is monitored and continuously recorded. A transition is marked by the absorption of energy by the specimen resulting in a corresponding endothermic peak in the heating curve. N OTE 1—Heat flow calibrations are sometimes determined in conjunc- tion with temperature calibration. Some differential scanning calorimeters permit both heat flow and temperature calibrations to be obtained from the same experimental procedure.
5. Significance and Use
5.1 Differential scanning calorimeters and differential ther- mal analyzers are used to determine the transition temperatures of materials. For this information to be meaningful in an absolute sense, temperature calibration of the apparatus and comparison of the resulting data to that of known standard materials is required. 5.2 This test method is useful in calibrating the temperature axis of differential scanning calorimeters and differential ther- mal analyzers.
6. Apparatus
6.1 Apparatus shall be of either type listed below: 6.1.1 Differential Scanning Calorimeter (DSC), capable of heating a test specimen and a reference material at a controlled rate and of automatically recording the differential heat flow between the sample and the reference material to the required sensitivity and precision. 6.1.1.1 A Furnace(s), to provide uniform controlled heating or cooling of a specimen and reference to a constant tempera- ture or at a constant rate within the applicable temperature range of this test method. 6.1.1.2 A Temperature Sensor, to provide an indication of the specimen temperature.6.1.1.3 Differential Sensors, to detect a heat flow (power) difference between the specimen and reference. 6.1.1.4 Test Chamber Environment, a means of sustaining a test chamber environment of nitrogen or other inert purge gas at a purge rate of 10 to 50 mL/min. 6.1.1.5 A Temperature Controller, capable of executing a specific temperature program by operating the furnace(s) between selected temperature limits at a rate of temperature change of 10°C/min. 6.1.1.6 Data Collection Device, to provide a means of acquiring, storing, and displaying measured or calculated signals, or both. The minimum output signals required for DSC are heat flow, temperature, and time. 6.1.2 Differential Thermal Analyzer (DTA), capable of heat- ing a test specimen and reference material at a controlled rate and of automatically recording the differential temperature between sample and reference material both to the required sensitivity and precision. 6.2 Containers (pans, crucibles, vials, lids, closures, seals, etc.), that are inert to the specimen and reference materials and that are of suitable structural shape and integrity to contain the specimen and reference in accordance with the specific require- ments of this test method. 6.3 Nitrogen, or other inert purge gas supply. 6.4 A Balance, to weigh specimens or containers (pans, crucibles, vials, etc.), or both to 60.1 mg. The balance should have a capacity greater than 20 mg.