Hardness of the wood
The classification of species is characterized by its resistance to puncture, which affects the wear of the surface.
More the wood is hard and less surface is deteriorated.
More wear layer is tough and thick, more renovation by sanding is possible.
Class of hardness depending on the thickness of attrition.
| Class hardness of species | Class of wooden floor according to the minimum thickness of the top layer (mm) |
| >=2,5 mm >=3,2 mm >=4,5 mm >=7 mm | |
|
Aa Bb Cc Dd |
21 21 22 22 21 22 23 31 23 32 33 41 31 33 34 41 |
| Classe A: |
(Wood mid hard) hardness between 10 and 20.N/Nmm ≈: spruce, pine, fir and alder. |
| Classe B: | (Wood mid hard)hardness between 20 and 30. N / Nmm ≈: brushed birch, teak, chestnut, melèze, cherry, walnut, maritime pine, and sipo. |
| Classe C: | (Hard wood) hardness between 30 and 40 N / mm ≈: Afrormosia, oak, doussié, maple, eucalyptus, ash, guatambu, beech, iroko, makoré, moabi, movingui, elm, charm, locust. |
| Classe D: | (Hard wood) hardness greater than 40 N / mm ≈: angelic, cabreuva, cumaru, ipé, jatoba, sucupira and wenge. |
What class of hardness, for what purpose.
| Classe | Type of use: |
| Residentail use | |
| 21 | Passage low, room and corridors living without access to the outside. |
| 22 | Passage means, living without access to the outside and lobby apartment. |
| 23 | Passage intense room with access to the outside or professional use. |
| Public use or Commercial use | |
| 31 | Moderate, weak or intermittent passage. |
| 32 | Passage, library, places of worship, shop without direct access to the outside world. |
| 33 | Passage intense, boutique with direct access to the outside, offices collective stairs. |
| 34 | Passage intense commercial use. |
| Industrial use | |
| 41 | Passage moderate area where the work is essentially sedentary with occasional use of light vehicle, factory workshop. |
| 42 | Place where the work is done primarily for standing and / or movement of vehicles. |
| 43 | Passage high, other light industrial areas. |