7
Concentration
The concentration indicates the proportion of diamond in the grinding layer (as a percentage by volume).
The concentration code is internationally standardized, as follows:
C100 means 25% by volume diamond content in the grinding layer.
The diamond content in carats (1 ct = 0.2g)
can be calculated from the density of diamond ρ = 3.52 g/cm
3
C 100 = 4.4 ct/cm
3
layer volume.
All other indications are derived from this:
C 25 = 1.10 ct/cm
3
layer volume
C 40 = 1.76 ct/cm
3
“
C 50 = 2.20 ct/cm
3
“
C 75 = 3.30 ct/cm
3
“
C 90 = 3.96 ct/cm
3
“
C135 = 5.94 ct/cm
3
“
Recommendations for specifying concentration can only be given as guidelines, i.e. the concentration is important for
efficient operation (to achieve a self-sharpening process). In general, specify low concentration for a small contact
surface, high concentration for a large contact surface.
Self-sharpening process
If the specification (grit size + bond + concentration) and the operating parameters are correctly specified, the diamond
tool will work efficiently, by means of self-sharpening. This gives optimal economic and technical performance, i.e. low
cost and fulfilment of the requirements for tolerance, surface finish and surface integrity. If the self-sharpening process
is not working properly, this may be corrected by appropriate changes in specification of the parameters mentioned
above (see also Tables on pages 33 and 37). Or to put it another way, the right bond is not the bond with the lowest
wear rate, but the bond with the correct wear rate. Similary, a high diamond concentration is no guarantee for an
optimal grinding result. The right specification is one which permits the self-sharpening process, i.e. continuous
efficient operation throughout the life of the tool.
Concentration
Self-sharpening process
Ordering data
diamond tools
