Thread: SRD & OTHER DIAMOND SPRAYS! Comparisons.

hi_bud_gl: *IF I UNDERSTAND THIS ALL CORRECTLY*
Mono does allude to one/single and poly alludes to many...but it doesn't mean one crystal or many crystals. I refers to the structure of the individual diamond crystals. Monocrystalline diamonds look like much like salt under a microscope, they are very strong and you must "round off" the corners of the crystals before the cutting action is compromised. Polycrystalline diamonds look a little more like coc-ker burrs under a microscope. They *supposedly* cut more aggressively and leave a finer finish due to the fact that they aren't very strong and will crack/break/crush into smaller diamonds just like the grit on your Aluminum Oxide or Sil. Carbide sandpaper. Polycrystalline is usually black, and both kinds are/can be man-made.
Here's the snippet that I found was the most helpful:
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Lynn: The SRD 15carats is the highest concentration I've found. (By a pretty good margin too!) Most places don't list the carat...only the fl. ounces. Metallography, Gem Cutting, and whatever you call guys who build stone/marble floors and monuments is where I've found most sources. Many give the option of mono or poly. They don't provide any details on grading...and the liquid carrier varies widely.

I'm using it to sharpen professional high-end shears. It's going on a 6" disk that spins like an old lp table...at 700-1700rpm. One of my mentors uses 3mic poly spray on a piece of billiard table wool. His source only sells in 16oz quantities. That's $90 before shipping...and at $90 for each grit it's going to get very very expensive to try 3mic vs. 1mic vs. 1/2mic. I'm quite sure 1/2mic is overkill, as we still want the edge to have ever-so-slight of a bite to it so that the hair doesn't "push" out of shear tips.

Sil. Carbide, CBN and 3M Trizact are the common abrasives used before polishing/stropping/burnishing the edge. Usually they jump from 9mic to polish.


I'll throw another question out there:
3M diamond lapping films. Really Really thinking of trying the PSA backed on a slab of glass...lapping gets old really fast. How easily do they gouge? A colleague has somehow quantified that it takes 10-12# of downforce on the blade to get a proper honing on the inside of the blades. Any chance at all they'll work for something like that?


Saw a few guys using the Naniwa diamond stones at a recent convention, don't know how they compare to my glasstones as far as hardness. Any experience there? Should probably head over to the hone subforum for that.

Dang, that was long. Los sientos.

The two types are best used for different applications. The price isn't that much different. Advantages of the poly?


■Higher cutting rates
■Very uniform surface finish
■More uniform particle size distribution
■Higher removal rates (self sharpening abrasives)
■Harder/tougher particles
■Blocky shaped
■Hexagonal microcrystallites (equally hard in all directions)
■Extremely rough surface (more cutting points)
■Surface area 300% greater than monocrystalline diamond
■No abrasion-resistant directionality (abrasion independent of particle orientation)

Of course the poly wear much faster than the mono reason being the mono is one single xtl while the poly is made up of individual grains.

Speaking of polydiamonds....


has anyone tried the Dupont Poly Diamond spray from Japanese knife sharpening I've been curious about it for a while now but haven't taken the plunge....

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