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Sobu
Cleistopholis glauca Pierre
ANNONACEAE
otu (Nigeria); Sobou (Côte d`Ivoire); Ovok (Gabon); Avom (Gabon); Lukunzu (Congo); Ovok (Cameroon); Avom (Cameroon); Sobu; Sobou; Otu; Lukunzu; Avom; Ovok
Cleistopholis grandiflora De Wild.; Cleistopholis bequaertii De Wild.; Cleistopholis bequaerti De Wild.
The base of the tree is slightly thickened. The bole is straight and cylindrical, may be up to 20 m in length. The trunk diameter attains 80 cm.
Cleistopholis glauca occurs in evergreen forests, mainly along riverbanks, in dense forest, in semi-deciduous forest and in secondary formations.
West Africa, from Cameroon to the Democratic Republic of the Congo.
Considered as a promising species for plantation. The duration of the rotation is 15 to 20 years, to reach 60 cm in diameter.
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel Axial parenchyma reticulate. Non-crystals in axial parenchyma cells. Axial parenchyma bands under 4 per mm. Rays less than 4 per mm (rare). Rays non-storied. Larger rays more than 4 seriate. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with simple to minutely bordered pits.
Unrestricted
The heartwood is whitish, it is not clearly demarcated.
6
Straight or slightly interlocked, sometimes with an influence on further processing operations.
This species is usually reported to have a coarse texture.
The surface of the wood is naturally low in luster.
Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.
5
Residual growth stresses are absent.
Silica Content: Silica content is negligible. Amounts over 0.05% may affect wood processing. Silica Value: 0.01
Nearly impossible to treat with a too much low penetration of the preservative substances.
0.34
0.35
7.5
3.4
FR-2
2.2
556
100692
285
29
41
151
232
It is easy to saw.
Not suitable for veneering.
Not suitable for veneering.
Slight blunting effect; ordinary tools can be used for sawing and machining.
Machining of this species is reportedly easy.
Easy; no particular problems.
Moderately easy; tools must be cautiously sharpened.
Moderately easy; tools must be cautiously sharpened.
Moderately easy; tools must be cautiously sharpened.
Easy to perform but low nails holding.
Glues well if basic gluing technical rules are followed.
Particular care is needed to avoid woolly aspect of the surface.
Needs pre-coating.
No particular problems.
FURNITURE AND CABINETS, common furniture, PACKING, light packing, OTHER AND MUSICAL INSTRUMENTS, door core, moldings, scale model
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