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

Importancia y uso:

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.

Subcomité:

D16.04

Referida por:

E1547-09R23, D1519-95R23

Volúmen:

06.04

Número ICS:

19.040 (Environmental testing), 71.080.01 (Organic chemicals in general)

Palabras clave:

analysis; capillary tube; melting point; melting range;