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N`TOM (Pachypodanthium staudtii)
Trade Name
N`tom
Scientific Name
Pachypodanthium staudtii Engl. et Diels
Family
ANNONACEAE
Common Names
Anioukéli (Côte d`Ivoire); Ntom (Gabon); Touom (Congo); Mbalinga (Central African Republic); Ntombé (Cameroon); Ntoma (Cameroon); Ntom (Cameroon); Molombo (Cameroon); Zree-chu; Pae-aduasa; Okyira; Okianga; Ntom; N`tom; Gpaladio; Fale; Djirrowa-tue; Aniouketi
Scientific Name Synonyms
Uvaria staudtii Engler & Diels; Pachypodanthium staudtii var. letestui Pellegr.; Pachypodanthium barteri (Benth.) Hutch. & Dalziel; Anona barteri Benth.
Description Of The Tree
Botanical Description
The tree reaches a height of 30 m. The bole is cylindrical, unbuttressed, straight, and may be up to 20 m. The trunk diameter attains 70 to 100 cm.
Natural Habitat
Pachypodanthium staudtii is usually found in small groups. It occurs in dense riparian forests, preferably on sandy or swampy surfaces.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel Axial parenchyma scalariform. Non-crystals in axial parenchyma cells. 5 to 8 cells per parenchyma strand. Axial parenchyma bands over 4 per mm. Rays less than 4 per mm (rare). Rays non-storied. Larger rays more than 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Oil and/or mucilage cells associated with the axial and/or ray parenchyma (idioblasts). Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is red brown or yellow brown with an occasional olive tinge and stripes, it is not clearly demarcated.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is typically fine in texture.
Natural Durability
Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Moderately resistant to termites attack.
Natural durability index (1= Very high durability, 7=Vey low durability)
5
Resistance To Impregnation
Easy to treat with a full penetration of the preservative products using vacuum-pressure method.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.68
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.76
Total shrinkage Tangential (Saturated to 0%MC) (%)
8.9
Total shrinkage Radial (Saturated to 0%MC) (%)
4.6
Drying Defects
Ease of Drying: Drying is moderately difficult to difficult; special care is systematically needed. Drying Defects: Risks of checks and distortions. Kiln Schedules: The kiln schedule has been tested.
Recommended Dry Kiln Schedule
FR-3
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.9
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1304
Stiffness (MOE) 12%MC (kgf/cm²)
157790
Compression parallel to fiber 12%MC (kgf/cm²)
781
Compression perpendicular to fiber 12%MC (kgf/cm²)
113
Shear strength radial 12%MC (kgf/cm²)
62
Janka hardness (side) 12%MC (kgf)
724
Janka hardness (end grain) 12%MC (kgf)
809
Workability
Sawing
It is moderately easy to saw.
Rotary Veneer Cutting
Suitable for slicing, also suitable for peeling if treated.
Sliced Veneer
Suitable for slicing, also suitable for peeling if treated.
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
Easy; no particular problems.
Turning
30
Boring
Easy; no particular problems.
Mortising
Easy; no particular problems.
Nailing
Pre-boring is necessary.
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
Working with hand tools is difficult.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, flooring, parquet, fittings, FURNITURE AND CABINETS, cabinets, PLYWOOD AND VENEER, TURNING, PACKING, CONTAINERS, cooperage, OTHER AND MUSICAL INSTRUMENTS, handicrafts
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Fittings
- 19 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Cabinet
- 24 - Empire Timbers
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Turning
- 30 - Embassy of Honduras in Japan
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Containers
- 50 - Properties of imported tropical woods
Cooperage
- 51 - Recopilacion de propiedades mecanicas de maderas creciendo en Chile
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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