Abrasive manufacturers use a variety of code numbers to identify the abrasive type, grit size, bond structure and treatments of their individual products. It is not practical to identify the various stones and so Delapena use a coding system that is common for all stone sizes
Three types of conventional abrasive grit are commonly used in honing.
Silicon Carbide (F)
A jagged, splinter like type of free cutting abrasive grit. Used on soft materials such as brass, bronze, aluminium and cast iron. Can also be used on very hard materials such as carbon, ceramic and hardened steels.
Aluminium Oxide (R)
A regular, chunky shaped grit used for deburring all materials and stock removal in most soft steels up to HRC 50.
A special purified form of aluminium oxide having a cool cutting action. Used on wear resistant materials such as hard chrome and heat treated steels above HRC 50.
Sulphur impregnation (\S)
Stones that are suffixed "s" are sulphur treated. An extreme pressure lubricant that helps to reduce heat, reduces clogging and loading of the stone surface and reduces pick up in softer materials.
A range of polishing stones that will produce a high degree of surface finish on most materials.
A cork stick impregnated with fine abrasive grit used for polishing especially stainless steels.
A cork stick used mainly for plateau honing of cylinder bores.