Relationships between Janka and Brinell hardnesses were determined using standard linear regression methods (10).
Table 1 lists the means, variations, the coefficient of variation, standard deviation and minimum and maximum values of Janka and Brinell hardnesses including air-dry density of the eastern beech wood specimens.
The mean values of Janka and Brinell hardnesses of the specimens ranged from 4,810 to 6,903 N and from 2.
On the basis of density and Brinell and Janka hardnesses, the eastern beech is classified into the group of medium hard wood.
Figures 1 through 3 show the relationship between Brinell and Janka hardnesses for cross, radial, and tangential sections of eastern beech, respectively, determined with linear regression analysis.
Figure 4 shows the relationship between the values of Brinell and Janka hardnesses for the total of radial and tangential sections.
Finally, Figure 5 shows the relationship between Brinell and Janka hardnesses for all data from the cross, radial, and tangential sections.
It has been reported that for a variety of wood species, the linear relationship equation between Brinell and Janka hardnesses was as follows: H(Y) = I 15[H.
It comes in hardnesses from 75 A to 72 D and in injection and extrusion grades, as well as a solution grade for dip coating.
Available in hardnesses of 47-49 and 60 A, they are designed for over-molding ABS, PC, and ABS/PC in computer housings.