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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.

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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).

  • Wood Macro Photo Tangential Plane
  • Wood Micro Photo Of Transversal Section

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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