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Thanks Glen, interesting!

Nothing like going to the source for the numbers. Here's a link to the draft 2015 Norton catalog, see page 52:
...

The following is opinion ...

No I don't think there's anything special about the Norton matrix but could be wrong of course. What I think is folks don't understand that it is entirely possible to...

No I don't believe it does lol.

If youre comparing the G20k to other synths, just get it (disclaimer, my synth experience is not great). If you're comparing it to JNat finishers, it does as we'll...

You're welcome. If you mix brands it's a good reference. I think there's a similar table in the SRP Library.

I don't know what Suehiro uses in this line. I'd be interested to know too. But now...

Yes, they don't use the same grit scales but microns are microns no matter what brand. AFAIK, Shapton uses a proprietary scale that's a little different from Naniwa (JIS) and both are a lot different...

This (12-15k) is exactly the grit range for "smoothness" Alex and I were talking about, Thuringians, kiita, coticule w/honing methods to reduce scratch depth (unicot, dilucot...).

Cheers, Steve

Or the engineers at Suehiro. They seem to have modeled the Gokumyo stone(s) to mimic the desirable qualities of a natural stone, undoubtedly a JNat. That means they had to know what physical...

Just a comment on grit scales - again - the Suehiro G20k is 0.5 microns, the Shapton 30k is 0.49 microns ... I'd go for the Suehiro. The Norton 8k is about 4.5k on the JIS scale Naniwa uses.

But...