ASTM E793-24 PDF
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St ASTM E793-24
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Ст ASTM E793-24
Original standard ASTM E793-24 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Enthalpies of Fusion and Crystallization by Differential Scanning Calorimetry (ASTM E793‑24). Defines procedures to determine the enthalpy (heat) of fusion (melting) and of crystallization using differential scanning calorimetry (DSC), with guidance for specimen selection, instrument settings, and data treatment for routine testing, quality control, and research applications.
Abstract
ASTM E793‑24 specifies a DSC test method to measure heats of fusion and crystallization for solid and liquid samples that crystallize within the instrument range. The method covers typical specimen forms, recommended temperature programs, and limits of applicability (thermally stable materials with well defined endothermic/exothermic behavior). Units are SI and results are intended for specification acceptance, quality control and research.
General information
- Status: Active (current ASTM standard, revision of the previous edition).
- Publication date: 2024 (published January 9, 2024; listed active/last updated September 12, 2024).
- Publisher: ASTM International.
- ICS / categories: 17.200.10 (Heat. Calorimetry).
- Edition / version: E793‑24 (2024 edition).
- Number of pages: 5 pages.
Scope
This test method describes determination of the enthalpy of fusion (melting) and crystallization by DSC. It applies to solid samples (granular or cut specimens) and to liquids that crystallize within the instrument range, noting that specimen form, mass and experimental conditions can affect results. Normal operating temperature range is approximately −120 °C to 600 °C (extendable depending on instrumentation). SI units are the standard.
Key topics and requirements
- Principle: measurement of heat flow associated with first‑order transitions (fusion and crystallization) using DSC instrumentation.
- Specimen considerations: suitable sample mass, form (granular, cut specimens), and calorimetric pan selection to minimize artefacts.
- Temperature program: controlled heating and cooling rates, baseline and reference handling to accurately integrate peak areas for enthalpy calculation.
- Operating range and limits: typical instrument range −120 °C to 600 °C; method intended for thermally stable materials with well‑defined peaks.
- Units and reporting: enthalpies reported in SI units; include specimen mass, heating/cooling rates, instrument model and calibration details.
- Intended uses: quality control, specification acceptance, research; users must consider limitations (effect of sample form/mass and experimental conditions).
Typical use and users
Laboratories performing thermal analysis, polymer and materials scientists, pharmaceutical and chemical R&D, quality control and materials specification teams, instrument manufacturers and calibration labs. Typical applications include determination of melting/crystallization heats for polymers, pharmaceutical solids, specialty chemicals and other crystalline or partially crystalline materials for formulation, purity assessment, and process control.
Related standards
Closely related and cross‑referenced standards include ASTM E794 (melting and crystallization temperatures by thermal analysis), ASTM E473 (terminology for thermal analysis and rheometry), and relevant parts of the ISO 11357 series (DSC methods for plastics; the enthalpy/melting/crystallization portions are aligned in intent). E793‑24 revises the earlier E793‑06 family of editions.
Keywords
enthalpy of fusion, enthalpy of crystallization, differential scanning calorimetry, DSC, melting, crystallization, thermal analysis, calorimetry, heat of fusion, heat of crystallization, thermal transitions.
FAQ
Q: What is this standard?
A: ASTM E793‑24 is the ASTM test method that defines how to measure heats of fusion and crystallization using differential scanning calorimetry (DSC).
Q: What does it cover?
A: It covers specimen preparation considerations, instrument operation (temperature programs and ranges), data integration for enthalpy calculation, reporting requirements (SI units), and limitations related to specimen form, mass and thermal stability.
Q: Who typically uses it?
A: Thermal analysis laboratories, materials and polymer scientists, pharmaceutical and chemical R&D labs, quality and specifications engineers, and instrument/calibration facilities. It is used for research, product development and routine QC.
Q: Is it current or superseded?
A: E793‑24 is the current (active) edition as of 2024; it is a revision that replaces earlier editions in the E793 series (previously E793‑06 and its reapprovals). Publication/active listing dates appear in vendor and ASTM records (2024; active/last updated Sep 12, 2024).
Q: Is it part of a series?
A: E793 is part of ASTM Committee E37’s thermal analysis/calorimetric test methods and is commonly used alongside related ASTM methods (E794, E473) and harmonized with ISO DSC methods (ISO 11357 series) for plastics and thermal measurements.
Q: What are the key keywords?
A: enthalpy, fusion, crystallization, DSC, thermal analysis, heat of melting, heat of crystallization, calorimetry, melting point, crystallization temperature.