Species: Keruing


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Keruing
Species profile
The heartwood is light red to red brown or purplish red brown. Presence of resin. Possible wind shakes. It has clearly demarcated sapwood. The grain is straight or interlocked and the texture is coarse. Density at 12 % moisture content: 0.79 g/cm3.

The blunting effect is high; peeling is reported to be good and slicing is not recommended or without interest. Variable silica content. Some species are very resinous and tend to clog tools. Occasional tearing on quartersawn. Nailing is good but pre-boring is necessary. Gluing is correct but must be done with care due to the presence of resin. It dries slowly. Moisture content is very variable especially for the most resinous species. Careful stacking and end coating are recommended.

Keruing is moderately durable to fungi and is durable to dry wood borers; sapwood demarcated (risk limited to sapwood). Several species are regrouped under the name Keruing of the genus Dipterocarpus and the natural durability is variable from one species to another. It is thus recommended to restrict the use without preservative treatment for end-uses under biological hazard class 2.


Keruing can be used for several applications such as:
• interior: e.g. flooring, stairs, panelling, veneer, boxes and crates, joinery
• exterior: e.g. exterior joinery, panelling, ship building, bridges, wood frame house, vehicle or container flooring, heavy carpentry

Plywood for light woods. Resin and shakes may restrict end-uses. In Asia, this species is used for sleepers and poles with a treatment.

References
• CIRAD Forestry Department

Family:DIPTEROCARPACEAE (angiosperm)
Origin:Asia and Oceania
Local and common name(s)
Gurjun, Keruing, Mai Sat, Keruing Beras, Yang, Hora, Dau, Keroeing, Mai Nhang, Keruing Bajak, Kanyin, Apitong,
Scientific name(s)
Dipterocarpus spp.,
Typical use
Flooring, Vehicle or container flooring, Wood frame house, Interior joinery, Exterior panelling, Ship building (planking and deck), Veneer for back or face of plywood, Stairs (inside), Heavy carpentry, Exterior joinery, Interior panelling, Bridges (Parts not in contact with water or ground), Veneer for interior of plywood, Boxes and crates,
Risk
Commercial restriction:No commercial restriction
IUCN Red List status:
Appearance
Grain:Straigth or interlocked
Interlocked Grain:Slight
Sapwood:Clearly demarcated
Texture:Coarse
Typical colour:Red Brown
Physical description
Crushing strength:65 (+/- 7) MPa
Specific Gravity (at 12% MC):0,79 (+/- 0,07)
Stability:Moderately stable to poorly stable
Static bending strength:115 (+/- 14) MPa
Durability
Dry wood borers:Class D - Durable - sapwood demarcated
Fungi:Class 3 - Moderately durable
Termites:Class S - Susceptible
Treatability:Class 3 - Poorly permeable
References
Technical descriptions from the software Tropix 7 [1], with permission of the Research Unit Biomass, Wood, Energy, Bioproducts [2], CIRAD [3].

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Keruing