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ASTM E794-06

(Test Method)

Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis

Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis

SIGNIFICANCE AND USE
Differential scanning calorimetry and differential thermal analysis provide a rapid method for determining the fusion and crystallization temperatures of crystalline materials.  
This test is useful for quality control, specification acceptance, and research.
SCOPE
1.1 This test method describes the determination of melting (and crystallization) temperatures of pure materials by differential scanning calorimetry (DSC) and differential thermal analysis (DTA).
1.2 This test method is generally applicable to thermally stable materials with well-defined melting temperatures.
1.3 The normal operating range is from 120 to 600 C for DSC and 25 to 1500 C for DTA. The temperature range can be extended depending upon the instrumentation used.
1.4 Computer or electronic based instruments, techniques, or data treatment equivalent to those in this test method may be used.
1.5 SI units are the standard.
This standard does not purport to address all of the safety problems, 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.

General Information

Status
Historical
Publication Date
28-Feb-2006
ICS
17.200.10 - Heat. Calorimetry
Technical Committee
E37 - Thermal Measurements
Drafting Committee
E37.01 - Calorimetry and Mass Loss
Current Stage
Ref Project

Relations

Replaces
ASTM E794-01 - Standard Test Method for Melting and Crystallization Temperatures by Thermal Analysis
Effective Date
01-Mar-2006
Replaced By
ASTM E794-06(2012) - Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis
Effective Date
01-Sep-2012
Referred By
ASTM D5577-19 - Standard Guide for Techniques to Separate and Identify Contaminants in Recycled Plastics
Effective Date
01-Mar-2006
Referred By
ASTM E1214-11(2023) - Standard Guide for Use of Melt Wire Temperature Monitors for Reactor Vessel Surveillance
Effective Date
01-Mar-2006
Referred By
ASTM D8046-21 - Standard Guide for Pumpability of Heat Transfer Fluids
Effective Date
01-Mar-2006
Referred By
ASTM F2150-19 - Standard Guide for Characterization and Testing of Biomaterial Scaffolds Used in Regenerative Medicine and Tissue-Engineered Medical Products
Effective Date
01-Mar-2006
Referred By
ASTM E793-06(2018) - Standard Test Method for Enthalpies of Fusion and Crystallization by Differential Scanning Calorimetry
Effective Date
01-Mar-2006
Referred By
ASTM F2902-16e1 - Standard Guide for Assessment of Absorbable Polymeric Implants
Effective Date
01-Mar-2006
Referred By
ASTM F1925-22 - Standard Specification for Semi-Crystalline Poly(lactide) Polymer and Copolymer Resins for Surgical Implants
Effective Date
01-Mar-2006
Referred By
ASTM E2069-19 - Standard Test Method for Temperature Calibration on Cooling of Differential Scanning Calorimeters
Effective Date
01-Mar-2006
Referred By
ASTM F3384-21 - Standard Specification for Polydioxanone Polymer Resins for Surgical Implants
Effective Date
01-Mar-2006
Referred By
ASTM D5747/D5747M-21 - Standard Practice for Tests to Evaluate the Chemical Resistance of Geomembranes to Liquids
Effective Date
01-Mar-2006
Referred By
ASTM F2313-18 - Standard Specification for Poly(glycolide) and Poly(glycolide-co-lactide) Resins for Surgical Implants with Mole Fractions Greater Than or Equal to 70 % Glycolide
Effective Date
01-Mar-2006
Referred By
ASTM E928-19 - Standard Test Method for Purity by Differential Scanning Calorimetry
Effective Date
01-Mar-2006

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ASTM E794-06 - Standard Test Method for Melting And Crystallization Temperatures By Thermal AnalysisASTM E794-06 - Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis
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ASTM E794-06 - Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E794 − 06
StandardTest Method for
Melting And Crystallization Temperatures By Thermal
1
Analysis
This standard is issued under the fixed designation E794; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
3.1 Definitions—Specialized terms used in this test method
1.1 This test method describes the determination of melting
(and crystallization) temperatures of pure materials by differ- are defined in Terminologies E473 and E1142.
ential scanning calorimetry (DSC) and differential thermal
4. Summary of Test Method
analysis (DTA).
4.1 The test method involves heating (or cooling) a test
1.2 This test method is generally applicable to thermally
specimen at a controlled rate in a controlled environment
stable materials with well-defined melting temperatures.
throughtheregionoffusion(orcrystallization).Thedifference
1.3 The normal operating range is from −120 to 600°C for
in heat flow (for DSC) or temperature (for DTA) between the
DSCand25to1500°CforDTA.Thetemperaturerangecanbe
test material and a reference material due to energy changes is
extended depending upon the instrumentation used.
continuously monitored and recorded. A transition is marked
by absorption (or release) of energy by the specimen resulting
1.4 Computer or electronic based instruments, techniques,
in a corresponding endothermic (or exothermic) peak in the
ordatatreatmentequivalenttothoseinthistestmethodmaybe
heating (or cooling) curve.
used.
NOTE 1—Enthalpies of fusion and crystallization are sometimes deter-
1.5 SI units are the standard.
minedinconjunctionwithmeltingorcrystallizationtemperaturemeasure-
1.6 This standard does not purport to address all of the
ments. These enthalpy values may be obtained by Test Method E793.
safety problems, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5.1 Differential scanning calorimetry and differential ther-
bility of regulatory limitations prior to use.
malanalysisprovidearapidmethodfordeterminingthefusion
and crystallization temperatures of crystalline materials.
2. Referenced Documents
5.2 This test is useful for quality control, specification
2
2.1 ASTM Standards:
acceptance, and research.
E473Terminology Relating to Thermal Analysis and Rhe-
6. Interferences
ology
E793Test Method for Enthalpies of Fusion and Crystalliza-
6.1 Test specimens need to be homogeneous, since milli-
tion by Differential Scanning Calorimetry
gram quantities are used.
E967Test Method for Temperature Calibration of Differen-
6.2 Toxic or corrosive effluents, or both, may be released
tial Scanning Calorimeters and Differential ThermalAna-
when heating the material and could be harmful to personnel
lyzers
and to apparatus.
E1142Terminology Relating to Thermophysical Properties
7. Apparatus
7.1 Apparatus shall be of either type listed below:
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
7.1.1 Differential Scanning Calorimeter (DSC) or Differen-
Measurements and is the direct responsibility of Subcommittee E37.01 on Calo-
tial Thermal Analyzer (DTA)—The essential instrumentation
rimetry and Mass Loss.
required to provide the minimum differential scanning calori-
Current edition approved March 1, 2006. Published April 2006. Originally
metric or differential thermal analyzer capability for this
approved in 1981. Last previous edition approved in 2001 as E794–01. DOI:
10.1520/E0794-06.
method includes:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1.1.1 Test Chamber composed of:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(1)A furnace or furnaces to provide uniform controlled
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. heating (cooling) of a specimen and reference to a constant
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E794 − 06
temperatureorataconstantratewithintheapplicabletempera- 9. Calibration
ture range of this method.
9.1 Using the same heating rate, purge gas, and flow rate as
(2)A temperature sensor to provide an indication of the
that to be used for analyzing the specimen, calibrate the
specimen or furnace temperature to within 6 0.01°C.
temperature axis of the instrument using the procedure in
(3)Differential sensors to detect a heat flow difference
Practice E967.
(DSC) or temperatur
...

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