ASTM E1582-21 PDF
Standard Test Method for Temperature Calibration of Thermogravimetric Analyzers
Standard Test Method for Temperature Calibration of Thermogravimetric Analyzers
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 6
- Дата публикации:
- 1 июля 2021 г.
- Издание:
- E1582
- ICS:
- 17.200.20
SIGNIFICANCE AND USE 5.1 Thermogravimetric analyzers are used to characterize a broad range of materials. In most cases, one of the desired values to be assigned in thermogravimetric measurements is the temperature at which significant changes in specimen mass occur. Therefore, the temperature axis (abscissa) of all apparent-mass-change curves must be calibrated accurately, either by direct reading of a temperature sensor, or by adjusting the programmer temperature to match the actual temperature over the temperature range of interest. In the latter case, this is accomplished by the use of either melting point or magnetic transition standards. 5.2 This test method permits interlaboratory comparison and intralaboratory correlation of instrumental temperature scale data. SCOPE 1.1 This test method describe the temperature calibration of thermogravimetric analyzers over the temperature range from 25 °C to 1500 °C and is applicable to commercial and custom-built apparatus. This calibration may be accomplished by the use of either melting point standards or magnetic transition standards. 1.2 The weight change curve in thermogravimetry results from a number of influences, some of which are characteristic of the specimen holder assembly and atmosphere rather than the specimen. The variations from instrument to instrument occur in the point of measurement of the temperature, the nature of the material, its size and packing, the geometry and composition of the specimen container, the geometry and design of the furnace, and the accuracy and sensitivity of the temperature sensor and displaying scales. These all contribute to differences in measured temperatures, which may exceed 20 °C. In addition, some sample holder assemblies will show variations of measured temperature with sample size or heating/cooling rate, or both. Since it is neither practical nor advisable to standardize sample holders or thermobalance geometries, instruments may be calibrated by measurement of the deviation of a melting or magnetic (Curie point) transition temperature from the standard reference temperature. This deviation can be applied as a correction term to subsequent measurements. 1.3 This test method assumes that the indicated temperature of the instrument is linear over the range defined by a two-point calibration and that this linearity has been verified. These two calibration temperatures should be as close to the experimental measurements to be made as possible. 1.4 This test method describes two procedures for temperature calibration of thermogravimetric analyzers using any type balance. Procedure A uses melting point standards for calibration. Procedure B uses magnetic transition standards for calibration. 1.5 The data generated by these procedures can be used to correct the temperature scale of the instrument by either a positive or negative amount using either a one- or two-point temperature calibration procedure. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM E1582-21 is the standard test method for temperature calibration of thermogravimetric analyzers (TGA). Thermogravimetric analyzers are instrumental in characterizing material properties by measuring changes in mass as a function of temperature. Accurate temperature calibration is essential because it ensures that the temperature axis of thermogravimetric data reliably corresponds to the true sample temperature, leading to more precise detection of significant mass changes in specimens.
This standard details calibration for TGAs over a wide temperature range (25 °C to 1500 °C) using either melting point standards or magnetic transition standards. ASTM E1582-21 supports both commercial and custom-built thermogravimetric analyzers and establishes procedures to facilitate interlaboratory and intralaboratory consistency.
Key Topics
- Temperature Calibration Methods: The standard covers two main procedures:
- Procedure A: Uses melting point standards.
- Procedure B: Uses magnetic transition (Curie point) standards.
- Instrumentation Variability: Recognizes sources of variability such as sample holder geometry, atmosphere composition, sample size, and heating rates.
- Calibration Range: Applicable for temperature measurement from 25 °C to 1500 °C.
- Correction of Temperature Readings: Outlines the use of one-point or two-point calibration corrections to ensure linearity and accuracy in temperature measurement.
- Documentation and Reporting: Specifies the details to be reported, including reference materials, instrument configuration, calibration procedures, and environmental conditions.
- Precision and Bias: Provides guidelines for assessing repeatability and reproducibility in calibration results.
Applications
Thermogravimetric analyzers are widely used in:
- Materials Characterization: Accurate temperature calibration allows for the reliable determination of transition points such as melting, decomposition, or magnetic transition in polymers, metals, ceramics, and composites.
- Quality Control: Ensures consistent production quality in industries relying on thermogravimetric analysis by standardizing temperature calibration procedures.
- Research and Development: Assists laboratories in comparing data across different instruments or facilities, supporting innovative new material development.
- Compliance and Certification: Helps organizations meet regulatory and industry requirements for calibration and measurement procedures, enhancing both internal and external audit readiness.
Related Standards
The following ASTM standards are referenced or relevant to temperature calibration of thermogravimetric analyzers:
- ASTM E2040: Test Method for Mass Scale Calibration of Thermogravimetric Analyzers
- ASTM E967: Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
- ASTM E473: Terminology Relating to Thermal Analysis and Rheology
- ASTM E1142: Terminology Relating to Thermophysical Properties
- ASTM E691: Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Practical Value
Implementing ASTM E1582-21 ensures that thermogravimetric analyzers provide accurate, reproducible temperature data essential for reliable material analysis. The standard enables:
- Consistent calibration across a variety of instruments
- Reliable detection of material transition temperatures
- Enhanced comparability of test results within and between laboratories
- Improved compliance with international standards for thermal analysis
By following ASTM E1582-21, laboratories and manufacturing facilities can maintain high standards of accuracy and quality when performing thermogravimetric measurements, ultimately contributing to better product performance and material research outcomes.
Технические детали
- Технический комитет
- E37 - Thermal Measurements
- SKU
- ASTM E1582-21
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