In FEPA F standard only 3% percent of particles are larger. JIS is not better standard. Hones 10k and finer are not covered by standards.
I have Naniwa, Suehiro, Shapton, King stones and more others.
I started to sharpening 19 years ago.
Printable View
The “FEPA F Standard”, Oh, why didn’t you say so….
Ok, you win.
:popcorn:
<sarcasm on>
+/- 0.3 um? Oh no that will just leave gigantic scratches readily visible in any electron microscope! That might scratch my hair before cutting it!
<sarcasm off>
<rant on>
So I really hate it when people apply the statistic numbers and standards to the wrong thing.
The particle size link (http://www.engis.com/pdf/Particle-Si...s-summer07.pdf) applies to one company's separation technique of CBN and diamond powders which are not used in the Naniwa 10k or 12k. There are other companies that do it differently. So while the link is full of good information it is just useless fluff.
And as stated, hones 10k and finer are not covered by the standards so applying the standards in relationship to a 10k or 12k is just a waste of time.
<rant off>
The 12k naniwa leaves smaller scratches than the 10k. You can look high magnification and see the size difference or even measure the difference of the scratches.
Wow it looks like I really sparked a big debate type thing! HAha, well I have the 10k, but I went ahead and bought a 12k anyway... figured i'de use it to polish knife bevels as well, so all I have to get next is the 8k SS stone. I have an 8k glass, not sure how similar in micron it is to the SS 8k
The 10k SS is 1.37 micron, does that make the 12k like 1.05 micron? The glass 16k is .95, I considered buying that with my glass 500, 1k, 4k, and 8k instead, but I really like the super stones on razors... gah I have too many water stones. I need to sell some I think. Thanks guys!
If you have an 8K Shapton, you don’t need the 8K Super Stone and it will not make a difference finishing on the 10 or 12k.
But if you are looking for a great 8K, the Naniwa Snow White, the old one, (IF-0001 Junpaku) not the new T-380, is a great 8k stone.
Feels much like a Super Stone but more aggressive and without the loading common with Super Stones. Lays a fine stria pattern and a very straight edge.
I cannot bear to read through all of this (tell me if I am wrong), but the Naniwa 10k has the abrasive finely ground in with the synthetic substrate and is a solid color as are the lower grits.
By comparison, the 12k SS has tiny dark dots all over it's surface. These are the actual abrasive in this hone, as I understand it. As they are harder, the substrate wears around them and they stick up. This is why you lightly lap the 12 SS properly after only a few razors. If you don't, it is a bed of nails, I think.
If you have not lapped your 12k, the 10k would definitely be better!
YMMV
My 12kSS is the pink one, it’s old and nothing like that. Leaves a smooth even stria pattern and super straight edge.
I have use some of the new White ones, and they work pretty much the same to me.
I'm not sure I agree. I just shot this photo of the two.
Attachment 225815