The phrase "are unsuitable for application" is correct and usable in written English.
It can be used when discussing items, methods, or conditions that do not meet the necessary criteria for a specific use or purpose.
Example: "The materials provided are unsuitable for application in this project due to their low durability."
Alternatives: "are not appropriate for use" or "are not fit for application."
The energy product of samarium-based permanent magnets is second to those based on neodymium, iron, and boron (Nd2Fe14B), but the latter have much lower Curie points than the samarium magnets and therefore are unsuitable for applications above approximately 300 °C (570 °F).
UV-responsive TiO2 photocatalysts are unsuitable for applications in indoor environments.
Ag2O is unsuitable for application in full-solar-spectrum photocatalysis, because it is unstable under UV irradiation.
However, the low-grade heat sources for micro-CHP systems were unsuitable for application to the conventional blade-type micro-steam turbines, because the low-grade heat sources of the saturated steam conditions included with condensing droplets caused blade erosion.
However, methods in those experiments were unsuitable for application as diagnostic tools.
67 The assistant secretary of the Scottish Board of Health wrote to the Registrar General for Scotland, Dr James Crauford Dunlop, that, although many of the provisions of these bills were unsuitable for application to Scotland, there were 'certain points' within them, 'notably the registration of still-births', which appeared to the Board to be of value.
Furthermore, SHPER uses threshold based sensing and, as such, is unsuitable for applications that need periodic reports because nodes may not communicate if thresholds are not reached.
Secondly, just as in TEEN (Manjeshwar and Agrawal 2001), SHPER uses threshold based sensing and, as such, is unsuitable for applications that need periodic reports because nodes may not communicate if thresholds are not reached.
However, given real building morphologies and particular architectural requirements for the modeling and data analysis, the frequently used methods in research work are unsuitable for practical application.
