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NIEUK (Fillaeopsis discophora)
Trade Name
Nieuk
Scientific Name
Fillaeopsis discophora Harms
Family
LEGUMINOSAE
Common Names
Oyi okan (Nigeria); Nieuk (Gabon); Enoumnoume (Gabon); Angocon (Equatorial Guinea); Koungui (Congo); Nonomba (Cameroon); Nom adoum (Cameroon); Eléko (Cameroon); Bongongui (Cameroon); Totom; Sonanaka; Oyi okan; Oviokan; Mupukupuku; Mukubakuba; Mbaka; Kwokwo; Kele; Etotum; Esonanaka; Enoumnoume; Douala; Bongongui; Bongongi; Bongonge; Angongi; Nieuk
Description Of The Tree
Botanical Description
The tree reaches a height of 16 to 23 m. The bole may be up to 3 to 5 m in length in mature specimens. The trunk diameter attains 100 cm.
Natural Habitat
Fillaeopsis discophora occurs in dry Mediterranean regions and in tropical forest. It prefers deep sandy soils.
Natural Distribution
West, Central, East Africa, from Senegal to Ethiopia, from Kenya to Mozambique, to Angola and Namibia.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma lozenge-aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Rays non-storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is yellowish white. The heartwood is pinkish brown, it is clearly demarcated.
Grain
It has highly interlocked grain; special care is needed when drying because of frequent risks of distortion.
Texture
Texture is usually medium to coarse.
Natural Durability
Moderately durable to decay. Without preservative treatment, this species can be used when risks of occasional re-humidification, but it is not suited for uses with risks of permanent or long-lasting humidification.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Silica Content
Silica Content: Silica content is negligible. Amounts over 0.05% may affect wood processing. Silica Value: 0.01
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.53
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.58
Total shrinkage Tangential (Saturated to 0%MC) (%)
6.4
Total shrinkage Radial (Saturated to 0%MC) (%)
3.3
Drying Defects
Ease of Drying: Terap seasons rapidly to fairly slowly. It takes 1 to 3 months to dry 15 mm thick boards to air-dry condition. Drying Defects: It has a moderate to slight tendency to bow, cup and check.
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.9
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
803
Stiffness (MOE) 12%MC (kgf/cm²)
119219
Compression parallel to fiber 12%MC (kgf/cm²)
456
Compression perpendicular to fiber 12%MC (kgf/cm²)
55
Shear strength radial 12%MC (kgf/cm²)
73
Janka hardness (side) 12%MC (kgf)
409
Janka hardness (end grain) 12%MC (kgf)
513
Workability
Sawing
It is easy to saw.
Rotary Veneer Cutting
Not suitable for veneering.
Sliced Veneer
Not suitable for veneering.
Blunting Effect
Slight blunting effect; ordinary tools can be used for sawing and machining.
Machining
Machining of this species is reportedly easy.
Planing
Easy; no particular problems.
Moulding
Moderately easy; tools must be cautiously sharpened.
Boring
Moderately easy; tools must be cautiously sharpened.
Mortising
Moderately easy; tools must be cautiously sharpened.
Nailing
No particular problem.
Gluing
Glues well if basic gluing technical rules are followed.
Sanding
Easy to perform; it gives good results.
Polishing
Can be polished without surface preparation.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
PLYWOOD AND VENEER
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
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