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ASTM E324-16

(Test Method)

Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals

Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals

SIGNIFICANCE AND USE
5.1 It has long been recognized that narrow melting range and high final melting point are good indications of high purity in crystalline organic compounds. Several ASTM test methods use these criteria to assay the purity of organic compounds (Note 1). Test Method D1016 uses the cryoscopic constants plus the melting point of 100 % pure material to calculate the mol percent purity of the sample under test.
Note 1: Other ASTM test methods using melting (or freezing point) data to indicate sample purity are Test Methods D852, D1015, D1016, D1493, D1982, and D6875.  
5.2 The relatively simple and rapid test prescribed in this test method shows the sample under test to be either more or less pure than the standard sample. For specification purposes, a minimum allowable purity can be assured by setting limits on the differences in final melting points and the melting ranges between the standard sample and the sample under test.
SCOPE
1.1 This test method covers the determination, by a capillary tube method, of the initial melting point and the final melting point, which define the melting range, of samples of organic chemicals whose melting points without decomposition fall between 30 and 250°C.  
1.2 This test method is applicable only to crystalline materials that are sufficiently stable in storage to met the requirements of a satisfactory standard sample as defined in Section 7.  
1.3 This test method is not directly applicable to opaque materials or to noncrystalline materials such as waxes, fats, and fatty acids.  
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, handling, and safety precautions.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Oct-2016
ICS
19.040 - Environmental testing
71.080.01 - Organic chemicals in general
Technical Committee
D16 - Aromatic, Industrial, Specialty and Related Chemicals
Drafting Committee
D16.04 - Instrumental Analysis
Current Stage
Ref Project

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ASTM E324-16 - Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic ChemicalsASTM E324-16 - Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals
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ASTM E324-16 - Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals
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Standards Content (Sample)

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: E324 − 16
Standard Test Method for
Relative Initial and Final Melting Points and the Melting
1
Range of Organic Chemicals
This standard is issued under the fixed designation E324; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
2
1.1 This test method covers the determination, by a capil- 2.1 ASTM Standards:
lary tube method, of the initial melting point and the final D852 Test Method for Solidification Point of Benzene
melting point, which define the melting range, of samples of D1015 Test Method for Freezing Points of High-Purity
organic chemicals whose melting points without decomposi- Hydrocarbons
tion fall between 30 and 250°C. D1016 Test Method for Purity of Hydrocarbons from Freez-
ing Points
1.2 This test method is applicable only to crystalline mate-
D1493 Test Method for Solidification Point of Industrial
rials that are sufficiently stable in storage to met the require-
3
Organic Chemicals (Withdrawn 2004)
ments of a satisfactory standard sample as defined in Section 7.
D1982 Test Method for Titer of Fatty Acids
1.3 This test method is not directly applicable to opaque
D6809 Guide for Quality Control and Quality Assurance
materials or to noncrystalline materials such as waxes, fats, and
Procedures for Aromatic Hydrocarbons and Related Ma-
fatty acids.
terials
1.4 Review the current Safety Data Sheets (SDS) for de- D6875 Test Method for Solidification Point of Industrial
Organic Chemicals by Thermistor
tailed information concerning toxicity, first aid procedures,
handling, and safety precautions. E1 Specification for ASTM Liquid-in-Glass Thermometers
E11 Specification for Woven Wire Test Sieve Cloth and Test
1.5 The values stated in SI units are to be regarded as
Sieves
standard. No other units of measurement are included in this
E180 Practice for Determining the Precision of ASTM
standard.
Methods for Analysis and Testing of Industrial and Spe-
1.6 This standard does not purport to address all of the 3
cialty Chemicals (Withdrawn 2009)
safety concerns, if any, associated with its use. It is the
E1547 Terminology Relating to Industrial and Specialty
responsibility of the user of this standard to establish appro-
Chemicals
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3. Terminology
1.7 This international standard was developed in accor-
3.1 Definitions:
dance with internationally recognized principles on standard-
3.1.1 See Terminology E1547 for definition of terms used in
ization established in the Decision on Principles for the
this test method.
Development of International Standards, Guides and Recom-
3.1.2 initial melting point, n—the temperature at which
mendations issued by the World Trade Organization Technical
positive evidence of liquefaction is observed (see 9.4.1).
Barriers to Trade (TBT) Committee.
1 2
This practice is under the jurisdiction of ASTM Committee D16 on Aromatic, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Industrial, Specialty and Related Chemicals and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D16.04 on Instrumental Analysis. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2016. Published November 2016. Originally the ASTM website.
3
approved in 1967. Last previous edition approved in 1999 as E324 – 99 which was The last approved version of this historical standard is referenced on
withdrawn April 2001 and reinstated in November 2016. DOI: 10.1520/E0324-16. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E324 − 16
3.1.3 final melting point, n—the temperature at which the 120 mm long and 0.9 to 1.1 mm in internal diameter with walls
last crystal disappears into the melt. 0.2 to 0.3 mm thick and closed at one end.
6.3 Thermometer, of the partial immersion type and of
4. Summary of Test Method
suitable range selected from Specification E1. It shall be
4.1 1 This test method determines initial and final melting
divided into subdivisions of 0.5°C and capable of being read to
points by a relative procedure, utilizing a standard sample that
0.1°C.
has been assigned jointly accepted melting point values by the
6.4 Sieve—The 125-µm sieve used in preparation o
...

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ASTM E324-23(Test Method)
Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals

SIGNIFICANCE AND USE
5.1 It has long been recognized that narrow melting range and high final melting point are good indications of high purity in crystalline organic compounds. Several ASTM test methods use these criteria to assay the purity of organic compounds (Note 1).
Note 1: Other ASTM test methods using melting (or freezing point) data to indicate sample purity are Test Methods D852 and D6875.  
5.2 The relatively simple and rapid test prescribed in this test method shows the sample under test to be either more or less pure than the standard sample. For specification purposes, a minimum allowable purity can be assured by setting limits on the differences in final melting points and the melting ranges between the standard sample and the sample under test.
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1.1 This test method covers the determination, by a capillary tube method, of the initial melting point and the final melting point, which define the melting range, of samples of organic chemicals whose melting points without decomposition fall between 30 °C and 250 °C.  
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1.3 This test method is not directly applicable to opaque materials or to noncrystalline materials such as waxes, fats, and fatty acids.  
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, handling, and safety precautions.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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.  
1.7 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.

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5.1 It has long been recognized that narrow melting range and high final melting point are good indications of high purity in crystalline organic compounds. Several ASTM test methods use these criteria to assay the purity of organic compounds (Note 1).
Note 1: Other ASTM test methods using melting (or freezing point) data to indicate sample purity are Test Methods D852 and D6875.  
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1.1 This test method covers the determination, by a capillary tube method, of the initial melting point and the final melting point, which define the melting range, of samples of organic chemicals whose melting points without decomposition fall between 30 °C and 250 °C.  
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