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abrasive grades

Thu Jul 05, 2012 7:06 am

I've noticed most of the products out there(here too) don't specify the grit scale they use. I assume that Japanese style water stones use JIS but other products can be a mystery. Personally I prefer real measurements to arbitrary scales, in this case everything should be in nominal microns. At least then I only have to experiment with type of grits, bond type(hard/soft, film, metal plate) feel, and longevity. Instead trying to match grit size-progression between different brands of flat stones, powered wheels, films, rods, and strop compound.

I just found this page comparing Japanese, USA, and European grit scales.http://www.uama.org/Abrasives101/101Standards.html it's a bit technical but the charts are good, as you can see they are all about the same below 300 grit, but in the fine grits they are all over and not linear (kind of like the mohs hardness scale).
There are also different scales for coated(film, belts, sandpaper) vs bonded(stones) and loose grits.

Long story short: a grit number has a max & min micron size(the d94%-d3% charts) and a target range for the average size(the d50% charts). ANSI is an old scale developed around natural grits and thus has a much wider tolerance range for each grit than the newer F&P Euro or JIS grades. If something is labeled in microns only it is generally in a very tight range.

As you can see, a bonded/loose ANSI-600 averages about 9-12 micron
a JIS 1000 about 11-13 micron,
The euro F600(bonded is F, coated is P) is about 8-10.5 micron
Likewise ANSI 1200 at 3-4.5 microns is about JIS 3500

Re: abrasive grades

Thu Jul 05, 2012 8:37 am

Somebody on Knifeforums spent a LONG time contacting all the companies and bugged them a bit for information on their grit scales and piled it all together here:

http://www.knifeforums.com/forums/showp ... t/2475134/

Credit goes to Komitadjie for posting such a great chart.

Re: abrasive grades

Thu Jul 05, 2012 10:02 am

awesome updated ones too

Re: abrasive grades

Thu Jul 05, 2012 5:01 pm

whoa that is amazing.

Re: abrasive grades

Thu Jul 05, 2012 11:37 pm

Michiel Vanhoudt wrote:Somebody on Knifeforums spent a LONG time contacting all the companies and bugged them a bit for information on their grit scales and piled it all together here:

http://www.knifeforums.com/forums/showp ... t/2475134/

Credit goes to Komitadjie for posting such a great chart.


I'm wondering if we should sticky that chart in this forum?

It's very useful for referencing different brands and cobbling together an ala carte progression using diffferent brands and types of stones.

Re: abrasive grades

Fri Jul 06, 2012 2:29 am

chefknivestogo wrote:
Michiel Vanhoudt wrote:Somebody on Knifeforums spent a LONG time contacting all the companies and bugged them a bit for information on their grit scales and piled it all together here:

http://www.knifeforums.com/forums/showp ... t/2475134/

Credit goes to Komitadjie for posting such a great chart.


I'm wondering if we should sticky that chart in this forum?

It's very useful for referencing different brands and cobbling together an ala carte progression using diffferent brands and types of stones.


+1 sticky!

Re: abrasive grades

Fri Jul 06, 2012 9:48 am

I'll ask Komi if he's ok with posting the chart here.
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