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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 ( ). Test Method 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 , , , , , and .
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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D852 Test Method for Solidification Point of Benzene
D1015 Test Method for Freezing Points of High-Purity Hydrocarbons
D1016 Test Method for Purity of Hydrocarbons from Freezing Points
D1493 Test Method for Solidification Point of Industrial Organic Chemicals
D1982 Test Method for Titer of Fatty Acids
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
D6875 Test Method for Solidification Point of Industrial Organic Chemicals by Thermistor
E1 Specification for ASTM Liquid-in-Glass Thermometers
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
E1547 Terminology Relating to Industrial and Specialty Chemicals
ICS Number Code 19.040 (Environmental testing); 71.080.01 (Organic chemicals in general)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM E324-16, Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top