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MATA ULAT (Kokoona littoralis)
Trade Name
Mata ulat
Scientific Name
Kokoona littoralis M.A. Lawson
Family
HIPPOCRATEACEAE
Common Names
Sepalis (Indonesia); Bajan (Brunei Darussalam); Bajan (Sarawak); Mata ulat (Malaysia)
Scientific Name Synonyms
Lophopetalum maingayi Ridley; Lophopetalum dubium M.A. Lawson; Kokoona scortechinii King
Description Of The Tree
Botanical Description
It is a large tree up to 45 m tall, bole up to 100 cm in diameter. The buttresses are small or absent.
Natural Habitat
Kokoona littoralis is frequently reported in well drained primary forests, on leached clayey soils or in keranga forests up to 600 m of altitude.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Tangential diameter of vessel lumina 200 micras or more (large). Colored deposits in heartwood vessels. Vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and sh Axial parenchyma in marginal or in seemingly marginal bands. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Axial parenchyma aliform. Axial parenchyma confluent. Axial parenchyma storied. Prismatic crystals in chambered axial parenchyma cel 4 to 10 rays per mm (medium). Rays storied. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Fibers very thick walled. Fibers storied.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood merges gradually into heartwood. The heartwood is whitish to yellowish brown, shiny.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
Sometimes straight, frequently interlocked.
Texture
The wood is typically fine in texture.
Natural Durability
This species is reportedly moderately durable.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Resistance To Impregnation
The heartwood is untreatable either with oil or water soluble preservative substances, the sapwood is more amenable to preservative treatments.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.76
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.86
Total shrinkage Tangential (Saturated to 0%MC) (%)
6.4
Total shrinkage Radial (Saturated to 0%MC) (%)
4.7
Drying Defects
Ease of Drying: Air seasoning is reported to be easy with little or no degrade. Kiln Schedules: Schedule recommended for Andaman Padauk.
Recommended Dry Kiln Schedule
UK-C
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.4
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1264
Stiffness (MOE) 12%MC (kgf/cm²)
172211
Compression parallel to fiber 12%MC (kgf/cm²)
647
Shear strength radial 12%MC (kgf/cm²)
162
Janka hardness (side) 12%MC (kgf)
846
Workability
Sawing
Interlocked grain sometimes causes difficulties, it requires powerful equipment.
Rotary Veneer Cutting
Lamination is difficult because of density. A severe tendency to split and tear is reported.
Sliced Veneer
Lamination is difficult because of density. A severe tendency to split and tear is reported.
Blunting Effect
It is considered to have a severe blunting effect on the cutting elements.
Machining
Interlocked grain causes difficulties in machining. Reinforced cutters are needed.
Planing
It gives relatively good results despite its density, but some picking up may occur in radial faces.
Boring
This species is easy to bore.
Nailing
Pre-boring is needed because risk of splitting.
Gluing
It is reported to be easy to glue.
Finishing
It has a good finishing.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, bridges, poles, stakes posts, crossties, HOUSING GENERAL, beams, joists, flooring, parquet, frames, panelling, FURNITURE AND CABINETS, CONTAINERS, chemical storage
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Bridges
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
Poles
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Stake Posts
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
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
Flooring
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Frames
- 16 - Woods of the World
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Containers
- 50 - Properties of imported tropical woods
Chemical Storage
- 52 - Propiedades mecanicas y asociadas del pino insigne (Pinus radiata d.don)
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