ASTM D and ASTM E are two distinct series of standards developed by the American Society for Testing and Materials (ASTM) to cover various materials and testing applications.

Generally speaking, ASTM D standards are related to testing methods and specifications for various materials, including rubber, plastics, textiles, and petroleum products. This series of standards covers a wide range of physical and mechanical properties, such as tensile strength, hardness, and thermal properties, as well as various analytical methods for identifying and characterizing materials.

On the other hand, ASTM E standards are related to various testing and measurement methods for evaluating materials and systems in the fields of building and construction, aerospace, electronics, and environmental applications. This series of standards covers topics such as non-destructive testing, fire testing, thermal analysis, and environmental monitoring.

Overall, while there is some overlap between the two series of standards, ASTM D tends to cover more traditional materials testing applications, while ASTM E tends to focus more on specialized testing and measurement methods for specific industries and applications.