Тонкие микропорошки для полировки от производителя пигментов

Nikolay_K

29-7-2011 15:09 Nikolay_K

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Chrome oxide Cr2O3 ( Pigment green 17 )
Particle: spherical, size: 0.3 (μm) approx. ( Electron microscope )

Those pigments work beautifully, they are excellent.
There Cr2O3 is excellent for finishing razors.

This post about a European source of 0.3 micron Chromium Oxide powder caught my eye. And, so I bought it to try and compare. (Purchase source in an earlier post on this thread.)

I performed a test today to compare these two powders.
The primary question I had was related to the purity of the powder. Sure, it might have a lot of 0.3 micron grains of powder. But, if even 5% of the particles were larger, say, of 1 micron size, then it's no good!

I have a razor my wife bought for about $7, and as expected it is crap! Soft metal, and won't hold an edge, forms burrs easily, and you get the idea.
Because this razor isn't in use, and because it is seemingly soft metal that might more readily show scratches and striations from big particles, that razor became the test object.

I loaded up a balsa wood strip with a heavy dose of SRD CrOxide crayon. I loaded up another balsa strip with heavy amounts of powder (mixed with mineral oil.) The right side of the blade was exclusively stropped with SRD's CrOxide, 100 times. Every motion was in the same direction, and only affected the right side. I repeated the process for the left side of the blade, but used the CrOxide pasted balsa strop. 100 times to keep everything the same. While stropping, (if that is the right term when on balsa), I put a lot of pressure on the entire length of the blade to possibly accentuate the scratching and gouging that might result from larger particles.

Then, I cleaned both sides and examined both sides closely with a 100x microscope.

My non-scientific conclusions are that the CrOxide powder is very pure, judging by the total lack of anything that might possibly be interpreted as deep scratches or striations. The bevel was noticeably smoother, to the point that striations or scratches were barely visible, if at all visible. Tiny, shallow SRD scratches were discernable.

The CrOxide definitely removed metal, based on the discoloration of the CrOxide strop, and the visual inspection. But, it is a slower working medium that the SRD CrOxide crayon, not removing as much metal.

My overall conclusion is that the CrOxide powder is in all probability a very pure source of very small particle Chromium Oxide, and that it is appropriate for straight razor sharpening.

End of my experiment chronicle. Beginning of a muse...

Let's assume the above is correct, and the CrOxide powder is very small and very pure. Is this significant? I use the SRD CrOxide crayon as my last abrasive before the untreated linen and leather strops. My blades are sharp, and compare reasonably to a shave ready blade I purchased from Lynn. (I didn't say my edge was as good as Lynn's; no flame wars please! ) I am consistently getting good shaves.

Now, I believe I can put an even smoother edge on my bevels using Kremer CrOxide. And, it is possible that I might create a slightly sharper edge on my blades, (even tho I think this last statement is suspect.) But, I'm happy already!

(The obvious missing test is the shave test. The main reason I left it out is that I am not sure I could discern the difference between a smooth comfortable shave with SRD CrOxide as the final abrasive, and a smooth comfortable shave with CrOxide.)
So, for what it's worth.. .

Iron Oxide Red ( Pigment red 101 )
Synthetic Iron oxide a-Fe2O3
Predominant particle size (μm): spherical 0.09 (Electron microscope)

ivan-3


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