Scientific name

Guibourtia ehie J. Leonard

Other names

English: Mongoy, Ovengkol

Geographic origin

West Africa and Central Africa

Description

&;8226; Sapwood: Yellowish white colour that darkens with the light effects and changes into grey.
&;8226; Heartwood: greyish brown with frequent dark grey shades.
&;8226; Fiber: Straight. Slightly intertwined fibers are very frequent.
&;8226; Grain: Thin.
&;8226; Defects: white deposit bags

Capacity of being impregnated

&;8226; Sapwood: Capable of being impregnated
&;8226; Heartwood: Low capacity of being impregnated

Mechanization

&;8226; Sawing process: ordinary difficulties arise from hardness.
&;8226; Drying process: Medium speed to low speed. Little risk of deformation and crack formation.
&;8226; Planing process: Appart from hadness difficulties, risk of repelling is very frequent due to the intertwined fibers.
&;8226; Gluing process: No difficulties.
&;8226; Nailing and screwing process: Pre-drilling is required
&;8226; Finish: No difficulties

Physical properties

&;8226; Apparent density at 12% humidity 800 kg/m3 heavy wood
&;8226; Dimensional stability
- Volumetric contraction coefficient 0.49 % nervous wood.
- Relation between contractions
1.89 tendency to deformity
&;8226; Hardness (Chaláis-Meudon) 7.6 hardwood

Mechanical properties

&;8226; Resistance to static flexion 1,550 kg/cm2 &;8226; Elasticity module 157,000 kg/cm2
&;8226; Resistance to compression 690 kg/cm2

Observations

&;8226; They usually are small diameter trunks and so it is difficult to obtain wide Goods.
&;8226; Its streaking can be black or can have a strong pattern deppending on its origin