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MERPAUH (Swintonia schwenkii)
Trade Name
Merpauh
Scientific Name
Swintonia schwenkii (Teijsm. & Binnend.) Teijsm. & Binnend. Ex Hook.f.
Family
ANACARDIACEAE
Common Names
Ka-yu mue-yaeng (Thailand); Civit (Myanmar); Pitoh bukit (Sarawak); Baba chit (Sarawak); Merpauh periang (Malaysia); Rengas (Indonesia); Ambago (Indonesia); Galagensa (Indonesia); Khanthong (Thailand); Muom (Vietnam); Civit (Pakistan); Muom (Cambodia); Civit taungthayet (Myanmar); Taung Thayet (Myanmar); Merpau (Malaysia); Thayet-kin (India)
Scientific Name Synonyms
Anauxanopetalum schwenkii Teijsm. & Binnend.
Description Of The Tree
Botanical Description
It is a large tree up to 45 m tall. The bole is up to 70 cm in diameter. The buttresses are up to 3 m high.
Natural Habitat
Swintonia schwenkii is reported in primary or, rarely, in secondary lowland and hill forests. It is found in mixed dipterocarp or keranga forests, up to 700 m of altitude.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Tangential diameter of vessel lumina 200 micras or more (large). Tyloses common. Vessels per mm2 5 to 20. Vessel-ray pits reticulate and/or foraminate. Simple perforation plates. Intervessel pits large, 10 micras or more. Axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma reticulate. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. Axial parenchyma in narrow bands on lines up to 3 cells wide. 4 to 10 rays per mm (medium). Rays exclusively uniseriate. Silica bodies in the ray cells. 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).
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is generally grayish-white, pale red-brown or gray-brown with a pink tinge. The sapwood is not clearly differentiated from the heartwood and is often pale gray-brown with pink tinge.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
Straight or interlocked grain is common in this species.
Texture
This species is reported to have a medium to coarse texture.
Natural Durability
The wood is rated as non-durable in exposed conditions, but it is reportedly moderately durable to durable under cover.
Natural durability index (1= Very high durability, 7=Vey low durability)
5
Internal Growth Stresses
Timber of this species contains significant residual stresses.
Silica Content
Silica Content: It contains about 0.4% silica. Silica Value: 0.4
Resistance To Impregnation
The heartwood is moderately resistant to preservatives, the sapwood is permeable.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.65
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.73
Total shrinkage Tangential (Saturated to 0%MC) (%)
5.8
Total shrinkage Radial (Saturated to 0%MC) (%)
4.1
Drying Defects
Ease of Drying: Drying is fairly easy; some difficulties could occur when drying too fast. Drying Defects: Risks of collapse. Kiln Schedules: The kiln schedule has been tested.
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)
988
Stiffness (MOE) 12%MC (kgf/cm²)
159983
Compression parallel to fiber 12%MC (kgf/cm²)
489
Compression perpendicular to fiber 12%MC (kgf/cm²)
71
Shear strength radial 12%MC (kgf/cm²)
138
Janka hardness (side) 12%MC (kgf)
572
Workability
Sawing
Sawing of this species is reported to be rather easy, but the presence of tension wood may difficult this process.
Rotary Veneer Cutting
This species is reported to have good characteristics for lamination.
Sliced Veneer
This species is reported to have good characteristics for lamination.
Blunting Effect
Dulling of cutting tools is severe. The wood tends to jam the saw-blades.
Machining
It is easy to machine.
Planing
It is easy to plane.
Boring
Boring is reported to be difficult.
Nailing
The nailing behavior of this wood is considered as good to fair.
Gluing
It is reported to be easy to glue.
Finishing
This species is reported to give good to moderate results in finishing.
Steam Bending
Steam bending of this species is reportedly easy.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, flooring, panelling, FURNITURE AND CABINETS, PLYWOOD AND VENEER, PACKING, NAVAL CONSTRUCTION, boat hulls, OTHER AND MUSICAL INSTRUMENTS, matches
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.
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Boat Hulls
- 57 - Estadísticas de Aprovechamiento, Exportación y comercialización Nacional de Productos Forestales
Matches
- 71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement
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