Melting Temperature (Solidus)
A single, sharp melting point only really applies to very pure substances. Most materials enter a semi-molten transitional state at one temperature (solidus), and become fully liquid at another (liquidus).
Melting data is primarily useful for fabrication considerations, since mechanical properties tend to strongly deteriorate at a much lower temperature than the solidus. In metals, this deterioration is reversible on cooling, unless the material has been heat-treated or work hardened, in which case some degree of annealing is likely to have occurred.
The phenomenon of melting is generally a little too obvious to need standardized tests. However, some standards exist to cover a few challenging cases. For example, ASTM D7138 for synthetic fibers, and ASTM F766 for waxes.
Material Properties Explained
Material Properties Explained is a handbook published by MakeItFrom.com. It is a concise encyclopedia of engineering material properties. It is not tied to the MakeItFrom.com material properties database, and covers a far larger number of properties than those used on the website. Subject matter includes:
- Differences in definition and testing between types of materials.
- Common testing variations and their significance.
- What additional information is required to correctly interpret a value.
- Any equations to calculate or estimate property values.
- Synonyms and related terms.
- Relevant international testing standards, including both ASTM and ISO.
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