Quote Originally Posted by bill3152 View Post
One interesting fact although it doesnt tell the whole story is the SG 20k is .5 micron particles, as opposed the the shapton 30k is .49. So particle wise they are essentially the same. I never used the shapton 30k so I have nothing to say about it.
I know little to nothing about mfg of stones but, I think the binder has as important an impact on the characteristics of the stone as the size of the grit. Also, whether the abrasive is close in size, I'm not at all sure the 30k and the 20k are made with the same material ? Maybe, maybe not. We could ask the companies that make them but my guess is they ain't sayin'.