ASTM_E_1269_-_11.pdf

Designation:E126911Standard Test Method forDetermining Specific Heat Capacity by Differential ScanningCalorimetry1This standard is issued under the fixed designation E1269;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of specificheat capacity by differential scanning calorimetry.1.2 This test method is generally applicable to thermallystable solids and liquids.1.3 The normal operating range of the test is from 100 to600 C.The temperature range can be extended,dependingupon the instrumentation and specimen holders used.1.4 The values stated in SI units are to be regarded as thestandard.1.5 Computerorelectronic-basedinstrumentation,techniques,or data treatment equivalent to this test methodmay be used.NOTE1Users of this test method are expressly advised that all suchinstruments or techniques may not be equivalent.It is the responsibility ofthe user of this test method to determine equivalency prior to use.1.6 This method is similar to ISO 113574,but containsadditional methodology not found in that method.Additionally,ISO 113574 contains practices not found in this standard.Thismethod is similar to Japanese Industrial Standard K 7123,butcontains additional methodology not found in that method.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 9.2.Referenced Documents2.1 ASTM Standards:2E473 Terminology Relating to Thermal Analysis and Rhe-ologyE967 Test Method for Temperature Calibration of Differen-tial Scanning Calorimeters and Differential Thermal Ana-lyzersE968 Practice for Heat Flow Calibration of DifferentialScanning CalorimetersE1142 Terminology Relating to Thermophysical Properties2.2 ISO Standard:ISO 113574 Plastics:Differential Scanning Calorimetry(DSC)-Determination of Specific Heat Capacity32.3 Japanese Industrial Standard:K 7123 Testing Methods for Specific Heat Capacity ofPlastics33.Terminology3.1 DefinitionsTechnical terms used in this test methodare described in Terminologies E473 and E1142.4.Summary of Test Method4.1 This test method consists of heating the test material ata controlled rate in a controlled atmosphere through the regionof interest.The difference in heat flow into the test material anda reference material or blank due to energy changes in thematerial is continually monitored and recorded.5.Significance and Use5.1 Differential scanning calorimetric measurements pro-vide a rapid,simple method for determining specific heatcapacities of materials.5.2 Specific heat capacities are important for reactor andcooling system design purposes,quality control,and researchand development.6.Interferences6.1 Since milligram quantities of specimen are used,it isessential that specimens are homogeneous and representative.1This test method is under the jurisdiction ofASTM Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.01 on Calo-rimetry and Mass Loss.Current edition approved April 1,2011.Published May 2011.Originallyapproved in 1990.Last previous edition approved in 2005 as E1269 05.DOI:10.1520/E1269-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 The occurrence of chemical changes or mass loss onheating during the measurement may invalidate the test.Therefore,the temperature range and specimen holders shouldbe chosen so as to avoid these processes.6.3 Water samples have a special interference.The largeheat of evaporation causes the specific heat capacity to be toolarge if there is too much head space in the sealed crucible.Completely fill the crucible for most accurate results.7.Apparatus7.1 Differential Scanning Calorimeter(DSC)The essentialinstrumentation required to provide the minimum differentialscanning calorimetric capability for this method includes:7.1.1 DSC Test Chamber,composed of the following:7.1.1.1 Furnace(s),to provide uniform controlled heating(cooling)of a specimen and reference to a constant temperatureor at a constant rate within the applicable 100 to 600 Ctemperature range of this test method.7.1.1.2 Temperature Sensor,to provide an indication