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NATURAL WHETSTONES "2 Medaglie"
Quartz is the abrasive material most frequently occurring in nature.
However only few natural stones have the correct relation between quartz and carbonates (bonding agents); a perfect equilibrium that the natural stones of our production achieve.
The natural characteristics of the stones are still emphasised by the use with water, which, reacting with the lime, removes it slightly, leaving the abrasive quartz granulates permanently exposed. All this allows a quick and perfect cleaning of the stone, whereby the abrasive characteristics are permanently maintained.
Quality of the natural stone "La Pradalunga" "2 medaglie oro":
- High quartz content (45/50 %) with hardness 7 of the Mohs scale, thus suitable for cutting or (sharpening) steel.
- Carbonate is the principal bonding agent (hardness 3/4 of the Mohs scale) which permits a strong cohesion.
- Homogeneous dimension of the quartz particles (only a few tenths of a Micron).
- The sharp edged quartz grains: high friction ability.
- Homogeneous distribution of the quartz grains: constant and perfect use even after long time.
All this permits an easy, natural (without synthetic oils) and long use.
Application: with water.
Cleaning: leave stone to soak in water and vinegar for 12 hours.
NATURAL WHETSTONES
"Quality standard"
 Natural stones which allow sharpening of all kind of blades, also with non professional steel and finishing characteristics.
Quality of the stone:- high friction ability;
- Easy use
Application: with water.
Cleaning: leave stone to soak in water and vinegar for 12 hours.
NATURAL GRINDSTONE (Sandstone)The Natural Grindstones (Sandstones) can be used on all kind of machineries, which don't exceed 450 revolutions per minute (see table) and freshen up with water.
The characteristics of our grinstones, extracted since centuries from a quarry, allow a perfect sharpening of all kind of blades without modifying the tempering of the steel and at the same time an excessive metal removal (this quality can hardly be find in synthetic mixture grindstones).
ATTENTION: freshen up stone with water.
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