N52 sits in the N35–N52 series of the shared grade maximum working temperature table, listed at 80°C (176°F). That is the extent of the grade statement made on this page: a series membership and a listed maximum working temperature. No performance figure is derived from the grade name, no demagnetization curve value is quoted, and no claim is made that N52 is suitable or unsuitable for a particular application, because suitability depends on temperature, shape, direction and environment together.
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How to discuss a grade without overclaiming
Discuss grades as series plus temperature. The shared table lists six series: N35–N52 at 80°C, 33M–48M at 100°C, 33H–48H at 120°C, 30SH–45SH at 150°C, 30UH–40UH at 180°C and 28EH–38EH at 200°C. A buyer who states an operating temperature can be pointed to the series whose listed maximum covers it, and that is a discussion, not a guarantee: the inquiry should still confirm the combination of grade series, shape and direction. The company's sintered page carries demagnetization curve charts for several grades, including N52; curve values were not transcribed, so they are not quoted here.
Combining a grade with a shape, as in N52 disc magnets, does not create a new published product. The disc range and the grade table remain two separate published items, and a combined inquiry must satisfy both: the dimensions must fall inside the disc range, and the temperature discussion must use the shared table. The blog guide on N52 disc magnets follows the same rule.