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Official Journal of the Japan Wood Research Society

Table 1 Strength classes and characteristic values for hardwoods at 12 % m.c., according to the NBR 7190

From: Potential of rubberwood (Hevea brasiliensis) for structural use after the period of latex extraction: a case study in Brazil

HARDWOODS

Classes

σ c,k (MPa)

σ s,k (MPa)

E c║,m (MPa)

D b (g cm−3)

D 12 (g cm−3)

C20

20

4

9500

0.500

0.650

C30

30

5

14,500

0.650

0.800

C40

40

6

19,500

0.750

0.950

C60

60

8

24,500

0.800

1.000