Introduction to ASTM E793
The quick approach for determining the enthalpic changes that accompany first-order transitions in materials is differential scanning calorimetry. Research, specification acceptance, and quality control can all benefit from this test methodology. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM E793 tests for our clients.
ASTM E793 Test Method
| Weighing the specimen | Weighing 1 to 15 mg of specimen into a dry, clean specimen capsule yields an accuracy of 60.1%. |
| Sealing the specimen | In ambient settings, the specimen capsule is sealed or crimped with a lid to minimize the amount of open space between the specimen and the lid. Hermetic sealing in an inert atmosphere might be preferred for specimens that are oxidation-sensitive. |
| Loading the specimen | The specimen is inserted into the instrument’s chamber. Dry nitrogen, or any other inert gas, is pumped into the chamber at a rate of 10 to 50 mL/min during the experiment. |
| Heating and Re-weighing the specimen | The specimen is heated to 50°C below melting point, stabilized, and cooled at 10°C per minute. After scanning, it’s reweighed, and discarded if there’s a reaction or mass loss. |
ASTM E793 Test Specimens
| Sample Detail | Materials that are granular or powdered should be thoroughly mixed before sampling, and portions should be taken from different areas of the container. In turn, these parts need to be well mixed and blended to provide a representative specimen for the determination. Samples of liquid may be taken immediately following mixing. |
| Sample Size | Sample homogeneity is crucial since milligram quantities of specimens are used. |
ASTM E793 Test Result
ASTM E793 effectively explains how to use differential scanning calorimetry (DSC) to calculate the enthalpy (heat) of fusion, or melting, and crystallization.
ASTM E793 Related Tests
ASTM E793 is related to tests including ASTM E473 for thermal analysis-related terms, ASTM E968 for calibration of heat flow, and ASTM E1142 for thermophysical properties-related terms.
