Regge Wood specializes in tropical hardwoods and their applications. Our range of tropical woods is extremely suitable for
Sustainability class and strength class wood
Sustainability class wood
The sustainability class of wood varies from 1 to 5, in which 1 is very sustainable and five not sustainable at all. Azobé, according to the sustainability class wood table, is located in class 1. This is very sustainable wood and very suitable for civil engineering purposes. Robinia is located in sustainability class 1-2 and with that, it is the most sustainable type of European hardwood.
In the following table, the sustainability classes are listed.
Class | Sustainability | Lifespan |
1 | Very sustainable | + 25 years |
2 | sustainable | 15-25 years |
3 | Sufficiently / moderately sustainable | 10-15 years |
4 | Little sustainable | 5-10 years |
5 | Not sustainable | < 5 years |
Strength classes wood
For wood in architectural constructions, calculations according to building regulations are necessary. For this we use strength classes of the relevant wood species. The strength class for wood is an important property that gives a good indication of how strong a type of wood is. This strength class gives a good idea for which constructions the wood type is suitable. The strength class is indicated by the letter C for softwood and D for hardwood, followed by a number (e.g. C18), which corresponds to the representative value for the bending strength parallel to the fibre.
Examples of strength classes for structured wood, according to the NBN EN 338 standard
Examples of strength classes for structured wood, according to the NBN EN 338 standard | ||||||||||
Property |
Strength class |
|||||||||
Softwood |
Hardwood |
|||||||||
C16 |
C18 |
C24 |
C30 |
C40 |
D30 |
D40 |
D50 |
D60 |
D70 |
|
Bending resistance [N/mm²] |
16 |
18 |
24 |
30 |
40 |
30 |
40 |
50 |
60 |
70 |
Axial compressive yield strength [N/mm²] |
16 |
18 |
21 |
23 |
26 |
23 |
26 |
29 |
32 |
34 |
Average axial elasticity modulus [kN/mm²] |
8 |
9 |
11 |
12 |
14 |
10 |
11 |
14 |
17 |
20 |
Average voluminous mass [kg/m³] |
370 |
380 |
420 |
460 |
500 |
640 |
700 |
780 |
840 |
1080 |
Visual class |
S4 |
S6 |
S8 |
S10 |
– |
– |
– |
– |
– |
– |
There are many types of wood, all of which have their own unique properties, concerning the strength class and sustainability class. This makes that there will always be a suitable type of wood, for every utilization.
Our sales team has a lot of knowledge and is very willing to help you select the right type of wood. They can think along about the best solution. Call us on +31 547 286 350 or reach us by filling out the form on the right.