ASTM E793−06 Enthalpies of Fusion and Crystallization by Differential Scanning Calorimetry

E793 – 06 uses differential scanning calorimetry to determine the enthalpy (heat) of fusion (melting) and crystallization (DSC). It is used on solid materials in the form of granules or any constructed shape from which an acceptable specimen can be cut, as well as liquid samples that crystallize within the instrument's range. SI units are used as standard.

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ASTM E793−06 Enthalpies of Fusion and Crystallization by Differential Scanning Calorimetry

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM E 793 enthalpy of fusion and crystallization testing is a standardized material testing method that involves using differential scanning calorimetry to determine the enthalpies of fusion and crystallization of materials, which is a measurement of heat absorbed during fusion or crystallization of a material sample. ASTM E 793 is a material testing standard that specifies procedures for preparing material specimens, calibrating a differential scanning calorimeter, and measuring enthalpies of fusion and crystallization, which is essential information for materials engineers, polymer scientists, and thermal analysts.

Scope, Applications, and Benefits

Scope

The test for the enthalpy of fusion and crystallization of materials is performed in accordance with ASTM E 793. This test involves heating and subsequently cooling a test specimen in a calorimeter. The calorimeter is then calibrated to determine the enthalpy values per gram.

ASTM E 793 enthalpy testing evaluates:

Enthalpy of fusion of crystalline and semi-crystalline polymer and material specimens
Enthalpy of crystallization during controlled cooling of molten material specimens
Degree of crystallinity estimation from fusion enthalpy for semi-crystalline polymer materials
Comparative phase transition enthalpy across material formulations and thermal histories
Compliance with the defined enthalpy of fusion requirements for material specification programs

Applications

Semi-crystalline polymer materials require a degree of crystallinity and fusion enthalpy data
Pharmaceutical materials requiring melting enthalpy for purity and polymorphism assessment
Wax, fat, and lipid materials requiring fusion and crystallization enthalpy characterization
Metals and alloys requiring phase transition enthalpy measurement for thermal analysis
Material suppliers and researchers requiring ASTM E 793 DSC enthalpy test data

Benefits

Provides reliable fusion and crystallization enthalpy data for material thermal characterization
Supports material specification compliance and supplier assessment programs
Identifies crystallinity and phase transition anomalies in materials before processing
Delivers traceable DSC enthalpy test records for engineering and research submissions
Reduces material risk by verifying phase transition enthalpy early in the characterization cycle

Test Process

Sample Preparation

Specimens prepared to defined mass and encapsulated in DSC pan per ASTM E 793 requirements.

DSC Calibration

DSC instrument calibrated using certified reference standards for temperature and enthalpy accuracy.

Thermal Scanning

Specimens heated and cooled through phase transitions at defined scan rate recording heat flow data.

Data Analysis & Reporting

Fusion and crystallization enthalpy peaks integrated and assessed for test compliance result.

Technical Specifications

Parameter	Details
Applicable Materials	Semi-crystalline polymers, pharmaceuticals, waxes, metals, and crystalline material systems
Specimen Geometry	Defined specimen mass per ASTM E 793 DSC pan encapsulation requirements
Thermal Scan Conditions	Defined heating and cooling rate per ASTM E 793 measurement requirements
Measured Parameters	Heat flow, fusion enthalpy, crystallization enthalpy, and peak transition temperature
Measured Outputs	DSC thermograms, fusion enthalpy, crystallization enthalpy, and test compliance result

Instrumentation Used for Testing

Calibrated differential scanning calorimeter with defined heating and cooling rate control
Certified enthalpy and temperature reference standards for DSC instrument calibration
Precision analytical balance for specimen mass measurement
Aluminum and hermetic DSC sample pan encapsulation equipment
Specialist DSC data acquisition and thermal event integration software
Data reporting and DSC thermogram visualization system

Results and Deliverables

DSC thermograms showing fusion and crystallization thermal event peaks for all specimens
Integrated fusion and crystallization enthalpy values expressed in joules per gram
Peak onset and peak transition temperatures for all measured phase transitions
Test compliance result assessed against defined material enthalpy specification requirements
ASTM E 793 DSC enthalpy test report for material characterization, research, and supplier assessment submissions

Why Choose Infinita Lab for ASTM E 793?

Infinita Lab is a trusted USA-based testing laboratory offering ASTM E 793 testing services across an extensive network of accredited facilities across the USA. Infinita Lab is built to serve the full spectrum of modern testing needs—across industries, materials, and methodologies. Our advanced equipment and expert professionals deliver highly accurate and prompt test results, helping businesses achieve quality compliance and product reliability.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

Frequently Asked Questions

ASTM E793-06 measures the heat flow during phase changes to find the enthalpies of fusion and crystallization of materials. It uses differential scanning calorimetry to assess the thermal properties of polymers, metals, and various other materials.

Enthalpy of fusion and crystallization represents the energy needed for phase changes. ASTM E793-06 helps assess material purity, crystallinity, and thermal behavior. This supports product development and quality control processes.

ASTM E793-06 is often used for polymers, plastics, composites, pharmaceuticals, and other materials where phase transitions and thermal properties matter for performance and processing.

ASTM E793-06 testing uses a differential scanning calorimeter to heat or cool samples at controlled rates. It records heat flow changes related to melting and crystallization transitions.

ASTM E793-06 results might be affected by how samples are prepared, the rates at which they are heated, and the calibration of instruments. These results may not fully reflect how materials behave in actual processing or service conditions.