Overview
ASTM E1142-23b: Standard Terminology Relating to Thermophysical Properties is a critical international standard developed by ASTM International. This document compiles selected terms and definitions specifically used in ASTM standards related to thermophysical properties, supporting clear and consistent communication in scientific, engineering, and industrial contexts. The terminology is designed to foster understanding, accuracy, and alignment in documentation and research regarding thermal and physical behaviors of materials, supporting compliance with globally recognized standardization principles.
Key Topics
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Specific Terminology: The standard provides clear, concise definitions for terms fundamental to thermophysical properties, such as thermal conductivity, thermal diffusivity, heat capacity, thermal expansion, viscosity, and phase diagrams. Only terms used or proposed for ASTM documents are included.
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Field-Specific Definitions: Where relevant, the standard distinguishes field-specific meanings (e.g., as in dynamic mechanical measurements), supporting correct use in various scientific and industrial settings.
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SI Units Compliance: All values, terms, and definitions refer exclusively to SI units, in accordance with international practice, eliminating ambiguities in measurement and reporting.
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Clarity of Definitions: Each definition is a single sentence, with supplementary explanations provided as discussions to support clear interpretation and practical application.
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Revision and Development: The standard is subject to regular review and revision by ASTM Committee E37, ensuring continued relevance in light of technical advances.
Applications
ASTM E1142-23b plays a foundational role across multiple sectors involving material science and thermophysics:
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Materials Characterization: Researchers and engineers rely on standardized terminology to accurately describe the thermal properties (e.g., glass transition, thermal conductivity, specific heat) of metals, polymers, ceramics, and composites.
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Product Development and Quality Control: Manufacturers use these definitions to develop testing protocols, document material properties, and ensure compliance with contract specifications and regulatory requirements.
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Thermal Analysis Techniques: The standard provides indispensable language for describing and interpreting results from methods such as differential scanning calorimetry (DSC), thermomechanical analysis (TMA), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA).
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Data Reporting and International Collaboration: Consistent terminology enables unambiguous reporting in scientific publications, industry reports, safety data sheets, and technical datasheets, enhancing cross-border collaboration and trade.
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Education and Training: Academic institutions employ this standardized vocabulary to support instruction in thermodynamics, materials science, and related engineering curricula.
Related Standards
ASTM E1142-23b is closely aligned with other ASTM terminology and test method standards, ensuring comprehensive coverage of relevant concepts, including:
- ASTM D4092: Terminology for Plastics: Dynamic Mechanical Properties
- ASTM E7: Terminology Relating to Metallography
- ASTM E344: Terminology Relating to Thermometry and Hydrometry
- ASTM E2744: Test Method for Pressure Calibration of Thermal Analyzers
These referenced standards deepen the scope of terminology, offering definitions tailored to plastics, metals, temperature measurement, and pressure calibration contexts.
Practical Value
By establishing a common language for thermophysical properties, ASTM E1142-23b helps ensure communication accuracy, reduces errors in specification interpretation, and underpins quality assurance activities in materials research, product development, and process engineering. Its adoption advances international harmonization, supporting innovation and efficiency in both research and industrial applications where thermophysical property data is essential.