Jasper 150x25x5.5mm on blank

A bar of technical jasper 150x25x5.5 mm on an aluminum blank is intended for use in manual grinding machines. The bar is finished and completely ready for work.
The tactile response when working with jaspers is very characteristic. It can vary greatly depending on the composition and hardness of the steel being processed, but it is always recognizable - it is the velvet stroke of the blade on stone, with a slight rustle, and sometimes even hissingly noisy. Technical jasper is one of the few natural stones that works well with hard steels. It easily cuts both powder and high-alloy (quick cut) steels with hardness up to 63 HRC. At the same time, it is characteristic that, despite its high hardness, technical jasper perfectly exposes the carbide structures of hypereutectoid steels (steels with a high carbon content, over 0.8%). The abrasive ability of technical jaspers is low. When working with many grades of steel, technical jasper may not leave signs of metal removal, such as blackening of the coolant or clogging of the stone. But this does not mean at all that jasper does not work. Technical jasper is used at the very finishing stages of finishing, it cannot sharpen a knife, but it can greatly add sharpness to a knife, as well as increase resistance to blunting.
Technical jasper is mined mainly in the Orsk region. Technical jasper is opaque, painted in a greenish-gray almost uniform color. The surface of the stone is matte, silky to the touch, the rock is very dense (the density of jasper is 2.7, and the hardness is up to 7 on the Mohs scale), when tapped it makes a glass ringing. The composition of technical jaspers is determined mainly by the quartz component (from 80 to 90%) and chlorite (up to 15-10%), as well as various other impurities, consisting mainly of metal oxides. What is important for the abrasive properties of jaspers is that they are characterized by the presence of a garnet mineral in the structure, which in turn affects the color scheme of the color and gives them (along with other oxides, such as iron) a greenish tint. The presence of garnet impurities is the main diagnostic sign of jasper itself.

Name Technical jasper
Grit 12000 grit (JIS)
Material Quartz rock with impurities
Appointment for machine sharpening
Color Grey-green
Recommended coolant oil
Modification on aluminum blank
Jasper dimensions 150x25x5.5mm
Dimensions 161x25x9.5mm
Bar weight 80 g