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RANGGU (Koordersiodendron pinnatum)
Trade Name
Ranggu
Scientific Name
Koordersiodendron pinnatum (Blanco) Merr.
Family
ANACARDIACEAE
Common Names
Kayu bugis (Indonesia); Tabu hitam (Indonesia); Karogkog (Philippines); Dangila (Philippines); Grepau (West Irian); Grepau (Indonesia); Amugis (Philippines); Ranggu (Sarawak)
Scientific Name Synonyms
Lannea speciosa (Blume) Engl. Ex Perk.; Koordersiodendron papuanum Kaneh & Hatus.; Koordersiodendron celebicum Engl.
Description Of The Tree
Botanical Description
It is a large, evergreen tree up to 50 m tall. The bole is cylindrical, branchless for up to 25 m, up to 80 cm in diameter, sometimes with buttresses up to 2 m high.
Natural Habitat
It is a scattered tree in lowland forests, growing up to 450 m of altitude. It prefers loamy soils.
Natural Distribution
It can be found in Philippines, Celebes, and Borneo (including Sabah).
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels exclusively solitary (over 90%). Occasionally tyloses common. Occasionally vessels per mm2 less than 6. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma reticulate. Rays of two distinct sizes. Rays and/or axial elements irregularly storied. Larger rays more than 4 seriate.
Availability
Cites Status
Unrestricted
General Wood Description
Odor
Its taste and odor is not perceptible.
Color
The sapwood is light pinkish, sharply marked off from the heartwood, which is reddish when fresh, turning reddish brown to russet, with age.
COLOR INDEX (1=Black, 7=Light yellow,white)
3
Grain
The grain is interlocked or wavy.
Texture
This species is reported to have a moderately fine texture.
Natural Durability
It is considered as non durable to moderately durable. It can be attacked by termites and it is moderately susceptible to Lyctus beetles. In Philippines it is reported as durable.
Natural durability index (1= Very high durability, 7=Vey low durability)
6
Resistance To Impregnation
Due to the presence of tyloses the heartwood is very difficult to treat with preservatives. The sapwood is moderately permeable to preservative treatment.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.71
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.80
Total shrinkage Tangential (Saturated to 0%MC) (%)
6.1
Total shrinkage Radial (Saturated to 0%MC) (%)
3.6
Drying Defects
Ease of Drying: Air drying is reported to be fairly rapid. Air drying of 13 mm, 25 mm and 38 mm thick boards of P. javanicum takes respectively 1.5 months, 2 months and 3.5 months.
Recommended Dry Kiln Schedule
UK-K; US-T13-C4S
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.7
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1530
Stiffness (MOE) 12%MC (kgf/cm²)
163384
Compression parallel to fiber 12%MC (kgf/cm²)
770
Shear strength radial 12%MC (kgf/cm²)
178
Janka hardness (side) 12%MC (kgf)
827
Workability
Sawing
The behavior of this species in sawing is considered to be fair to difficult. Band saws are recommended for ripping.
Rotary Veneer Cutting
It is probably not suitable for veneer because it is too heavy and liable to defects when peeled.
Sliced Veneer
It is probably not suitable for veneer because it is too heavy and liable to defects when peeled.
Blunting Effect
The wood has a moderate blunting effect.
Machining
Machining operations are easy to fair.
Planing
In planing, a 30 degrees cutting angle is suitable for back-sawn material, but 20 degrees is recommended for quarter-sawn stock.
Moulding
Molding is reported to be easy to fair.
Turning
30
Boring
Boring results in a good finish, but support is usually needed at the exit faces.
Mortising
Mortising operations are rather as easy to fair.
Nailing
Pre-boring is essential for nailing.
Finishing
This species is reported to finish well.
Polishing
It is easy to polish.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, poles, HOUSING GENERAL, flooring, panelling, FURNITURE AND CABINETS, cabinets, TURNING, cutlery, TOOLS, agricultural tools, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, OTHER AND MUSICAL INSTRUMENTS, handicrafts, moldings
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Poles
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Cabinet
- 24 - Empire Timbers
Turning
- 30 - Embassy of Honduras in Japan
Knife Handles
- 33 - Embassy of Gabon in Japan
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Agricultural Tools
- 44 - Atlas of Peruvian Woods
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Molding
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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