Significance and Use
Most thermal analysis experiments are carried out under temperature ramp conditions where temperature is the independent parameter. Some experiments, however, are carried out under isothermal temperature conditions where the elapsed time to an event is measured as the independent parameter. Isothermal Kinetics (Test Methods E 2070), Thermal Stability (Test Method E 487), Oxidative Induction Time (OIT) (Test Methods D 3895, D 4565, D 5483, E 1858, and Specification D 3350 and Loss-on-Drying (Test Method E 1868) are common examples of these kinds of experiments.
Modern scientific instruments, including thermal analyzers, usually measure elapsed time with excellent precision and accuracy. In such cases, it may only be necessary to confirm the performance of the instrument by comparison to a suitable reference. Only rarely will it may be required to correct the calibration of an instrument’elapsed time signal through the use of a calibration factor.
It is necessary to obtain elapsed time signal conformity only to 0.1 times the repeatability relative standard deviation (standard deviation divided by the mean value) expressed as a percent for the test method in which the thermal analyzer is to be used. For those test methods listed in Section 2 this conformity is 0.1 %.
1.1 This test method describes the calibration or performance confirmation of the elapsed-time signal from thermal analyzers.
1.2 SI units are the standard.
1.3 There is no ISO standard equivalent to this method.
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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3350 Specification for Polyethylene Plastics Pipe and Fittings Materials
D3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry
D4565 Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable
D5483 Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
E473 Terminology Relating to Thermal Analysis and Rheology
E487 Test Method for Constant-Temperature Stability of Chemical Materials
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1142 Terminology Relating to Thermophysical Properties
E1858 Test Method for Determining Oxidation Induction Time of Hydrocarbons by Differential Scanning Calorimetry
E1868 Test Method for Loss-On-Drying by Thermogravimetry
E2161 Terminology Relating to Performance Validation in Thermal Analysis
calibration; elapsed time; thermal analysis; time;
ICS Number Code 17.200.20 (Temperature-measuring instruments)
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Citing ASTM Standards
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