The phrase "material already used" is correct and usable in written English.
You could use this phrase to emphasize that something has already been used, either in a physical or figurative sense. For example: "We will not be able to use the material already used in the first experiment to conduct our second one."
To create industrial quantities of man-made sapphire, the material already used to cover the fingerprint-sensing home button and camera lens on its phones, Apple has a $578m£350m0m) deal with manufacturer GT Advanced Technologies, which has built a plant powered by renewable energy in Mesa, Arizona.
In summary, ZnO is a semiconductor material already used for water treatment.
Sheep wool is a natural material, already used for thermal insulation of pitched roofs, in the form of soft mats.
The valve was of the same type and material already used for the construction of valves that were worked in service without any problem.
However, it is unknown which substance (possibly an existing nanoparticulate material already used clinically in DDSs and possibly transported through the bloodstream, with confirmed safety and properties similar to those of CNTs) will be the appropriate reference material.
So-called phase change materials, already used in skiing socks and some forms of drywall, can help control temperature.
The starting points for me here were the open-plan nature of the space, the materials already used and the history of the building.
The Argonne researchers have improved the performance of the positive electrodes by increasing the chemical and structural stability of the materials already used in laptop batteries.
The raw materials are already used in skin lotions and shampoo, he said.
Nanoscale materials are already used in products as diverse as sun-blocking lotions, tennis balls, computer displays and paneling on cars.
At most, it might open up a new range of applications, from clothes that change colour to dimmable windscreens.Solid phase-change materials are already used to store data in optical memory disks.
