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The phrase "a class of material" is correct and usable in written English.
It can be used when referring to a specific category or type of material in various contexts, such as science, engineering, or education.
Example: "In our chemistry class, we studied a class of material known as polymers, which have unique properties."
Alternatives: "a category of material" or "a type of material".
Exact(5)
But Mr. Jahnigen eventually discovered PopFoam, a type of hard foam made of ethylene-vinyl acetate, a class of material similar to that used in Crocs, the popular and durable sandals.
Metallic nanoparticles as a class of material have many useful properties.
Although Fe0 is a class of material from a thermodynamic view (E 0 = −0.44 V), it should be considered that each Fe0 material is subject to its own unique corrosion process (intrinsic reactivity).
This means that Fe0 was considered a class of material and results obtained with various Fe0 materials compared to each other (Richardson and Nicklow 2002; Miehr et al. 2004; Birke et al. 2015; Li et al. 2016).
PCRAM, also known as PCM, perfect RAM (PRAM), OUM, and chalcogenide RAM (CRAM), is a type of nonvolatile RAM based on a class of material called chalcogenide glasses that can exist in two different phase states (e.g., crystalline and amorphous) [102, 103].
Similar(54)
Now there is excitement, and it is over a class of materials known as perovskites.
Both products belong to a class of materials known as silicone-based polyurethanes.
The warmest of the high-temperature superconductors -- a class of materials first discovered in 1986 -- remain superconducting, under high pressure, at up to minus 184 degrees.
These particles, called micelles, are one type of a class of materials known as nanoparticles.
The new material is part of a class of materials made of spongelike frameworks of inorganic elements.
Semiconductor nanocrystals represent a class of materials that have hybrid molecular and bulk properties.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com