CBN sharpening/honing stones 150-25-3, metal bond, any grain size, Poltava

Description

CBN sharpening stones,
Poltava
150 х 25 х 3
Length 150 mm x width 25 mm x thickness 3 mm
Length 6 inch x width 1 inch x thickness 0.12 inch
Material:
CBN - cubic boron nitride.
It has the best cost/productivity ratio for  processing of STEEL, comparing to diamond and cheaper stones.
CBN  is a generic name, there are also other names of this material, depending on manufacturer: borazon, elbor.
CBN grit: any,
please select from the list.
Please refer grain size conversion chart below.
There's also aluminum blank 160-25-3 in grain selection window, just in case you need support plate for these stones. I sell blank if you buy stone.
Metal bond.
Concentration
100%
.
Do not waste your money on cheaper stones with lower/unknown concentrations.
Flat
solid block.
Preparation
Stones with grits finer 3 microns either require preparation on cast iron plates, or they will be self-polished after sharpening of 30-50 knives. Then they will be  of gold color and work well.
This is common issue for all manufacturers, unless stones are prepared before shipment (cost 10usd). So there's "Stone preparation" option in grain selection window.
Use and cleaning
Use any comfortable oil (baby, olive..) to prevent glazing. If glazed - clean with alcohol and toothbrush.
Maintenance
is only needed every year or two.
In 1-2 years you may need to flatten stone, 20 mins with Ferric chloride (FeCl):
- 10 mins setting in 25% mixture (25 gr FeCl per 75 gr of water),
- 10 mins polish movements (carefully draw "8") on glass plate.
You may buy 100 gr. FeCl  in grain selection window. I sell it if you buy a stone.
I have also
diamond stones
for harder materials.
30000 grit = 0.5/0 μ
- fine polishing
15000 grit = 1/0 μ
- fine polishing
10000 grit = 2/1 μ
- fine polishing
5000 grit = 3/2 μ
- fine polishing
4000 grit = 5/3 μ
- polishing
3000 grit = 7/5 μ
- polishing
1700 grit = 10/7 μ
- polishing
1500 grit = 14/10 μ
- polishing
1100 grit = 20/14 μ
- polishing
650 grit = 28/20 μ
- polishing
550 grit = 40/28 μ
- fine grinding
325 grit = 50/40 μ
- fine grinding
285 grit = 63/50 μ
- fine grinding
240 grit = 80/63 μ
- fine grinding
225 grit = 100/80 μ
- fine grinding
160 grit = 125/100 μ
- grinding
100 grit = 160/125 μ
- grinding
80 grit = 200/165 μ
- sharpening / rough grinding
Made in Ukraine, by Poltava diamond tools, industry standard since 1966.
List of my wheels on stock
Shipping:
Ukrainian post (ukrposhta.ua), registered mail with tracking number; delivery time to US, Europe - 2-4 weeks.
Tracking will be available on your local post website when order arrives to your country; it is advisable to track on specialized sites like trackitonline, etc.
All orders do arrive if address is correct, but delivery time of some parcels  may be delayed up to 2 months because of logistics or customs issues. Please contact me first before opening case.
International Buyers – Please Note:
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.
Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.
Grain conversion chart