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RIKIO (Uapaca paludosa)
Trade Name
Rikio
Scientific Name
Uapaca paludosa Aubrev.
Family
EUPHORBIACEAE
Common Names
Koondi (Sierra Leone); Rikio (Côte d`Ivoire); Bosenge (Zaire); Assam (Gabon); N'sanvi (Congo); Assam (Cameroon)
Scientific Name Synonyms
Uapaca guineensis Müll. Arg.
Description Of The Tree
Botanical Description
The tree reaches a height of 20 m. The bole is straight, with large stilt roots. The trunk diameter attains 70 cm.
Natural Habitat
Uapaca paludosa is abundant in swampy regions, sometimes found also in the savanna forests.
Natural Distribution
West Africa.
Wood Identification
Anatomic Description Of Wood
Vessels per mm2 10 to 20 (abundant). Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tyloses thin walled. Tangential diameter of vessel lumina 150 to 200 micras (medium). Vessel-ray pits coarse throughout the ray cell. Occasionally mu Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Non-crystals in axial parenchyma cells. Rays storied. Rays of two distinct sizes. 4 to 10 rays per mm (medium). Larger rays more than 4 seriate. Silica bodies in the ray cells. Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is pale-pink or pale-red, it is not clearly demarcated.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is mostly coarse in texture.
Luster
This species is moderate in luster.
Natural Durability
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Natural durability index (1= Very high durability, 7=Vey low durability)
1
Internal Growth Stresses
Residual stresses are reported to be absent.
Resistance To Impregnation
Nearly impossible to treat with a too much low penetration of the preservative substances.
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
Drying Defects
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. Kiln Schedules: The kiln schedule has been tested.
Recommended Dry Kiln Schedule
FR-11
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1251
Stiffness (MOE) 12%MC (kgf/cm²)
257923
Compression parallel to fiber 12%MC (kgf/cm²)
651
Compression perpendicular to fiber 12%MC (kgf/cm²)
88
Shear strength radial 12%MC (kgf/cm²)
107
Janka hardness (side) 12%MC (kgf)
720
Janka hardness (end grain) 12%MC (kgf)
805
Workability
Sawing
It is easy to saw.
Rotary Veneer Cutting
Not suitable for veneering.
Sliced Veneer
Not suitable for veneering.
Blunting Effect
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Machining
Possible difficulties caused by interlocked grain are reported.
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
Pre-boring is necessary.
Gluing
Glues well if basic gluing technical rules are followed.
Sanding
Easy to perform; it gives good results.
Polishing
Needs pre-coating.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, rails, crossarms, crossties, HOUSING GENERAL, beams, joists, boards, flooring, parquet, steps, CONTAINERS, truck bodies, truck flooring, OTHER AND MUSICAL INSTRUMENTS, axle
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Rails
- 6 - Physical and mechanical properties of Eucalyptus deglupta Blume grown in Costa Rica
Crossheads Crossarms
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Crossties
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Joists
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Flooring
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Steps
- 17 - Tree Conservation Database
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Axles
- 73 - Handbook of Hardwoods
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