Azobé

Dark red to purplish brown wood. Intermediate zone between sapwood and perfect wood (heartwood). White deposits in the pores.

Azobé
Nom(s) botanique(s) :

Lophira alata, Lophira procera (synonymous)

Family: 
OCHNACEAE (angiosperm)

Commercial restiction: 
no commercial

 

Azobé WOOD DESCRIPTION


Color: dark red
Sapwood: clearly demarcated
Texture: coarse
Grain: Interlocked
Interlocked grain: marked

LOG DESCRIPTION


Diameter: from 60 to 100 cm
Thickness of sapwood: from 2 to 4 cm
Floats: no
Log durability: good

Note: Dark red to purple brown wood. Intermediate zone between sapwood and heartwood. White deposits in the pores.

Note:1,060,0410,72,70,690,0110,30,97,31,028poorly stable96916221214203539

Azobé PHYSICAL PROPERTIES

 

Physical and mechanical properties are based on mature heartwood specimens. These properties can vary greatly depending on origin and growth conditions.

 

Azobé MECHANICAL AND ACOUSTIC PROPERTIES 

 

 

Mean

 

Std dev.

 

 

Mean

 

Std dev.

Specific gravity *:

1,06

0,04

Crushing strength *:

96 MPa

9 MPa

Monnin hardness *:

10,7

2,7

Static bending strength *:

162 MPa

21 MPa

Coeff. of volumetric shrinkage:

0,69 %

0,01 %

Modulus of elasticity *:

21420 MPa

3539 MPa

Total tangential shrinkage (TS):

10,3 %

0,9 %

 

 

 

 

Total radial shrinkage (RS):

TS/RS ratio: Fiber saturation point:

 

7,3 %

1,4

28 %

 

1,0 %

 

(*: at 12% moisture content, with 1 MPa = 1 N/mm²)

 

 

Musical quality factor: 111,2 measured at 2569 Hz

 

Stability: poorly stable

 

Azobé NATURAL DURABILITY AND TREATABILITY


Fungi and termite resistance refers to end-uses under temperate climate. Except for special comments on sapwood, natural durability is based on mature heartwood. Sapwood must always be considered as non-durable against wood degrading agents.

E.N. = Euro Norm

Funghi (according to E.N. standards): class 2 - durable
Dry wood borers: durable - sapwood demarcated (risk limited to sapwood)
Termites (according to E.N. standards): class D - durable
Treatability (according to E.N. standards): class 4 - not permeable
Use class ensured by natural durability: class 4 - in ground or fresh water contact Species covering the use class 5: Yes

Note: This species is listed in the European standard NF EN 350-2.
Transitional wood has a variable durability. Good resistance to marine borers in temperate water but moderate resistance in tropical water. This species is thus considerated as "moderately durable" towards marine borers and covers the use class 5 only when used in temperate or cold marine environment.
According to the European standard NF EN 335, performance length might be modified by the intensity of end-use exposition.

REQUIREMENT OF A PRESERVATIVE TREATMENT


Against dry wood borer attacks: does not require any preservative treatment
In case of risk of temporary humidification: does not require any preservative treatment
In case of risk of permanent humidification: does not require any preservative treatment

Azobé DRYING


Drying rate: slow Risk of distortion: high risk
Possible drying schedule: 1
Temperature (°C)

Risk of casehardening: no

M.C. (%)

dry-bulb

wet-bulb

Air humidity (%)

Risk of checking: high risk

Green

40

37

82

Risk of collapse: no

40

44

38

68

Note: Surface drying period recommended (3 to 4 months)

30

44

36

59

(under shelter) prior to kiln drying. Drying very difficult

20

46

36

52

for thickness > 38 mm.

15

49

37

46

 

This schedule is given for information only and is applicable to thickness lower or equal to 38 mm. It must be used in compliance with the code of practice.

For thickness from 38 to 75 mm, the air relative humidity should be increased by 5 % at each step. For thickness over 75 mm, a 10 % increase should be considered.

 

Azobé SAWING AND MACHINING


Blunting effect: fairly high
Sawteeth recommended: stellite-tipped
Cutting tools: tungsten carbide
Peeling: not recommended or without interest
Slicing: not recommended or without interest

Note: Requires power. Log turning sawing recommended (internal stresses). Some difficulties in planing due to interlocked grain.

Azobé ASSEMBLING


Nailing / screwing: good but pre-boring necessary
Gluing: correct (for interior only)

Note: Variable gluing properties. Gluing must be done carefully (dry wood and smooth surface) as the wood is very dense.

Azobé COMMERCIAL GRADING

 

Appearance grading for sawn timbers:
According to SATA grading rules (1996)

For the "General Purpose Market":
- Possible grading for square edged timbers: choix I, choix II, choix III, choix IV
- Possible grading for short length lumbers: choix I, choix II
- Possible grading for short length rafters: choix I, choix II, choix III

For the "Special Market":

- Possible grading for strips and small boards (ou battens): choix I, choix II, choix III
- Possible grading for rafters: choix I, choix II, choix III

Azobé FIRE SAFETY

 

Conventional French grading:
- Thickness > 14 mm : M.3 (moderately inflammable)
- Thickness < 14 mm : M.4 (easily inflammable)
Euroclasses grading: D s2 d0

Default grading for solid wood, according to requirements of European standard EN 14081-1 annex C (April 2009). It concerns structural graded timber in vertical uses with mean density upper 0.35 and thickness upper 22 mm.

END-USES

 

 

Hydraulic works (fresh water)                                                                         Sleepers

Bridges (parts in contact with water or ground)                                            Industrial or heavy flooring

Vehicle or container flooring                                                                           Stairs (inside)

Heavy carpentry                                                                                                Bridges (parts not in contact with water or ground)

Wood frame house                                                                                           Cooperage

Poles                                                                                                                  Stakes

Resistant to one or several acids                                                                   Hydraulic works (seawater) Note: For end-uses under permanent humidification, transition wood must be eliminated.

Azobé MAIN LOCAL NAMES

 

Country
Benin
Cameroon
Ivory Coast
Ghana
Nigeria
Central African Republic
Germany
United Kingdom
Local name
EKI
OKOKA
AZOBE
KAKU
EBA
KOFYO
BONGOSSI
EKKI
Country
Cameroon
Congo
Gabon
Equatorial Guinea
Nigeria
Sierra Leone
Germany

Country
BONGOSSI
BONKOLE
AKOGA
AKOGA
EKKI
HENDUI
BONKOLE

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