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Meranti (Dipterocarpaceae)

Tree description and natural occurrence

Large trees ranging up to 70 m in height and 1.5 m in stem diameter. Stems usually have moderately large buttresses and straight cylindrical trunks.

 

A tropical rainforest species found throughout South East Asia and the islands of the South West Pacific region including the Indonesia, Philippines, and east Malaysia.

Sawn timber of these species is readily available.

Wood appearance

Colour.  The heartwood varies from pale pink to dark red in the light and dark red groups and from white through straw to yellow in the yellow-white groups. Sapwood cannot always be reliably identified by colour difference.

Grain.  Moderately coarse textured with quarter sawn material often displaying an attractive ribbon figure.

Wood properties

Density.  Variable, depending on the group: dark red - 670 kg/m3, light red - 560 kg/m3, white - 705 kg/m3, yellow - 660 kg/m3.

Strength Group.  Variable, depending on the group: dark red - S5, SD6; light red - S6, SD7; white - S4, SD5; yellow - S5, (SD6).

Shrinkage to 12% MC.  6.5 to 8.0 % (tangential); 4.0 to 5.0 % (radial).

Unit Shrinkage.  Not available.

Durability.  Class 4 - Suitable for use only in continuously dry situations under cover, well ventilated, clear of the ground and fully protected from the weather and other dampness.

Lyctid Susceptibility.  Untreated sapwood susceptible to lyctid borer attack.

Preservation.  Sapwood readily accepts preservative impregnation but penetration of heartwood is negligible using currently available commercial processes.

Seasoning.  All species can be satisfactorily dried using conventional air and kiln seasoning methods.

Hardness.  Firm to soft (rated 4 and 5 on a 6 class scale) in relation and ease of working with hand tools.

Machining.  Machines reasonably well to a smooth surface. However, some of the lower density species may give a woolly cut if sharp tools are not used.

Fixing.  No difficulty has been experienced with the use of standard fittings and fastenings.

Gluing.  Can be satisfactorily bonded using standard procedures.

Finishing.  Can be painted, stained or polished. However, due to its open grain timber surfaces may need to be filled before finishing.

Uses

Decorative.  Flooring, panelling, furniture, joinery, mouldings, plywood, turnery, carving.

Identification features

General characteristics

Sapwood.  Sometimes, but not always, lighter in colour than heartwood.

Heartwood.  Colour varies from white or yellow through to light red or pink-brown.

Texture.  Rather coarse but even.

Wood structure

Growth Rings.  Absent.

Vessels.  Moderately large with simple perforation plates, few or moderately few in number, mostly solitary, some in oblique or radial pairs or radial multiples up to 4; diffuse, occasional clusters. Tyloses present; vessel deposits absent.

Parenchyma.  Paratracheal parenchyma as incomplete, narrow vasicentric, aliform or occasionally confluent. Apotracheal parenchyma as irregularly spaced bands enclosing resin canals and as diffuse strands, often as short, narrow lines between the rays.

Rays.  Medium to fine, may be visible without a lens; may be conspicuous on radial surfaces.

Intercellular Canals.  Longitudinal canals often prominent in concentric series; distinctly visible without a lens in cross-section and longitudinal section; canals plugged with white coloured resin.

Other features

Burning Splinter Test.  Variable between species; some burn to an ash, others burn leaving no ash.

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