Sandpaper

80 grit Aluminum Oxide (abrasive) sandpaper versus Silicon Carbide (abrasive) sandpaper.
What is the practical difference, from the point of view of sharpening chisels, say? Any? I noticed a feller on the Woodsmith shop used Aluminum Oxide before he went to Silicon Carbinde on the finer grits.
Thank you, Bill
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Bill wrote:

The practical difference is that it's hard to find anything but aluminum oxide in coarse grits and anything but silicon carbide in fine grits.
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