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Loose Aluminum Oxide Powder


FEPA Grit: 120


Abrasive Aluminum oxide


Aluminum Oxide Powder is a perfect tool for lapping sharpening stones. Choose one of 5 available grit: F 230, F 400, F 600, F 800 and F 1200.

Use the aluminum oxide powder if the silicon carbide powder leads to abrasive contamination.

F 230
Lapping of medium waterstones (320 - 800 grit)
F 400
Lapping of fine/extra-fine waterstones (1000 - 4000 grit)
F 600
Lapping of extra-fine/ultra-fine waterstones (5000 grit and above).
F 800
Lapping of soft ultra-fine natural stones and Waterstones (10000 grit and above).
F 1200
Honing of soft ultra-fine natural stones


  • Net weight (+/- 5 g):
    F230 - 350 gram (12.3 oz)
    F400 - 260 gram (9 oz)
    F600 - 210 gram (7.4 oz)
    F800 - 200 gram (7 oz)
    F1200 - 190 gram (6.7 oz).

How to use

Warning! Respirator required to work with F800 and F1200 aluminum oxide powder. Inhalation can cause illness.

The Aluminum Oxide powder should always be coarser than a sharpening stone.

Take a slate pencil and put crosshatch pattern to the surface of the stone. Never skip this step. Your goal is to get rid of crosshatch completely. If you notice left-over of pattern somewhere, it means geometry is not flat yet.

Always add water to make a suspension, not dry Aluminum Oxide. Try to use glass area evenly. Your glass will wear over time because Aluminum Oxide affects glass too.

When Aluminum Oxide disintegrates, put another pinch (refresh). If there is too much suspension, clean your glass. Use a straight edge or metal ruler to check flatness. If you are not sure, make crosshatch pattern again.

The abrasive hygiene should be a priority. Don't let single coarse particle to remain in fine lapping.