Razors edge sharpening stones

[Slim7]

Hi,
I came across a video of someone using the razor edge sharpening stones. Im curious about the grit rating. Is the ultrafine stone finer than a Norton fine India stone? What are these stones made of Sic or alumuium oxide? Curious if the fine stone wears or gullys fast?​

 

[HeavyHanded]

Hi,
I came across a video of someone using the razor edge sharpening stones. Im curious about the grit rating. Is the ultrafine stone finer than a Norton fine India stone? What are these stones made of Sic or alumuium oxide? Curious if the fine stone wears or gullys fast?​

The fine stone is finer than an India, probably about an 800 grit. It wears slowly, appears to be AlumOx but I can't be sure. They sell seconds from time to time, but even the regular price is pretty good for these.

 

[David Martin]

HH, I was hoping you'd see this and come answer Slims question. Good working radar. They will not dish quickly if it's aluminum oxide. DM

 

[Slim7]

HH, I was hoping you'd see this and come answer Slims question. Good working radar. They will not dish quickly if it's aluminum oxide. DM

Thanks Guys!
So are the ultrafine razor edge stones pretty hard stones? I know this is off the subject, but i need someone expertise on lapping fine water stones for straight razors. Ive read that using wet/dry sandpaper to lap stones can cause the grit to get embedded in the pores and cause cross contamination
Certain stone manufacturers only recommend diamond plates. Some recommend loose Sic grit, but Imo it looks like loose grit would be more likely to get embedded as the sic breaks down and fractures. I maybe wrong, but is this just a marketing strategy to get people to buy their $$$ diamond plates? What are your guys thoughts on using sandpaper?

 

[FortyTwoBlades]

HH, I was hoping you'd see this and come answer Slims question. Good working radar. They will not dish quickly if it's aluminum oxide. DM

*Ahem*

Actually, most synthetic water stones are made of aluminum oxide, and those are notorious for how rapidly they dish. It's not the abrasive type that determines the rate of dishing, but rather the bond strength.

 

[HeavyHanded]

Thanks Guys!
So are the ultrafine razor edge stones pretty hard stones? I know this is off the subject, but i need someone expertise on lapping fine water stones for straight razors. Ive read that using wet/dry sandpaper to lap stones can cause the grit to get embedded in the pores and cause cross contamination
Certain stone manufacturers only recommend diamond plates. Some recommend loose Sic grit, but Imo it looks like loose grit would be more likely to get embedded as the sic breaks down and fractures. I maybe wrong, but is this just a marketing strategy to get people to buy their $$$ diamond plates? What are your guys thoughts on using sandpaper?

IIRC the problem with wet dry is in the bond layer, which encourages the abrasive to stick in the waterstone as it breaks down. I don't have first hand experience of this, but that means I don't use wet/dry to lap anything really. Regular lose grit will not embed to any extent.

For my waterstones I use a DMT XXC for rough flattening and a 180 mesh diamond grit lapidary disk for my finer ones.

The RE ultra fine seems to dish a little less than a SiC stone, more than an India stone. It would not be a good choice for lapping anything.

 

[David Martin]

The aluminum oxide I was speaking of was Norton's India stones. I have lapped mine after more than 10 years of sharpening on it. And it was
difficult to cut and bring to level. Thus, it has great economy. So, the Razor Edge stones are not of this hardness & binders. DM