Shorea Plagata (Balau)


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Scientific Name
Shorea plagata

Trade Name
Balau

Family Name
Dipterocarpaceae

Common Names
Balau, Balau merah, Membatu, Red balau, Red selangan batu

Regions of Distribution
Oceania and S.E. Asia

Countries of Distribution  [VIEW MAP]
Philippines

Common Uses
Baskets, Bent Parts, Boat building, Building materials, Cabinetmaking, Canoes, Chairs, Chests, Cooperages, Core Stock, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Drawer sides, Excelsior, Figured veneer, Fine furniture, Flooring, Food containers, Framing, Fuelwood, Furniture , Furniture components, Furniture squares or stock, Hatracks, Interior construction, Interior trim, Joinery, Kitchen cabinets, Lifeboats, Living-room suites, Millwork, Office furniture, Pallets, Paneling , Parquet flooring, Plain veneer, Tables , Veneer, Woodenware

Environmental Profile

Status has not been officially assessed

Distribution Overview
The Balau group of Shorea grows in Malaysia, Philippines, and Indonesia, and is often found in pure stands. The natural growth range of Shorea genus is rather extensive, from India and Sri Lanka in the west and throughout Burma and several countries in Southeast Asia, and up to the Philippines in the east. The forests of Borneo, Sumatra, and the Malay Peninsula are reported to contain the highest concentration of species in the genus.

Heartwood Color

Brown
Black
Light deep red brown or yellow-brown to brown or dark reddish-brown

Sapwood Color

Brown
Grey
Not differentiated from heartwood
Lighter than heartwood

Grain

Interlocked

 

Interlocked

Texture

Medium
Even or uniform
Uniform
Resinous and oily
Moderately fine to slightly coarse

Luster

Low
Non-lustrous
Dull

Natural Growth Defects

Hollowed logs are not uncommon
Abundant in some locations

Natural Durability

Perishable
Non-resistant to termites
Vulnerable to attack by powder-post beetles
Varied durability from non-durable to very durable

Odor

Has an odor
No distinct odor or taste

Kiln Schedules

T6-D4 (4/4)
T3-D3 (8/4) US Schedule G (4/4) United Kingdom

Drying Defects

Splitting
Distortion
Wood may end split and check
Warping is common but variable
Existing shakes may open up

Ease of Drying

Reconditioning Treatement
Fairly Easy
Little degrade
Dries slowly
Difficult
Air drying before kiln-drying is recommended

Tree Size

Trunk diameter is 100-150 cm

They often develop straight cylindrical boles with adequate merchantable lengths

Product Sources
Shorea is the major source of timber in Southeast Asia. They are plentiful, and supplies are universally available, especially in the form of veneers. This popular wood is typically priced in the inexpensive range.

Many species in the Shorea genus are also a source of other economically important non-timber products. Seeds of some species yield fat which is used in the manufacture of chocolate. Others produce nuts, the most common of which is the illipe nuts of commerce produced by S. gysbertisiana . The nuts yield a fat which is similar to cocoa-butter in some of its properties. Shorea trees are also tapped for oleo-resin, and typical dammar is obtained from S. wiesneri which grows in Java and Sumatra. The tree of S. robusta produces dammar which is used as a disinfectant and as incense in religious ceremonies in India. Other non-timber products from Shorea are reported to include tannin and fibers.

Blunting Effect

High to severe
Medium dulling effect on cutting edges

It is hard, heavy, and very dense and also because of the presence of interlocked grain

Boring

Fair to good results
Fairly difficult to very difficult
Difficult

They are hard and heavy, and usually contain interlocked grain

Carving

Fair to Good Results
Fairly Difficult to Very Difficult
Responds poorly to carving operations

Cutting Resistance

Fairly Difficult to Very Difficult to saw
Saws cleanly with moderate blutning of cutting edges

Gluing

Variable gluing properties

Mortising

Fair to Good Results
Fairly Difficult to Very Difficult
May prosuce some torn surface in material containing interlocked grain

Moulding

Fair to Good Results
Fairly Difficult to Very Difficult
Difficult moulding qualities

Balau timbers are usually hard and heavy

Movement in Service

Fair to Good Stability – Medium Movement
Retains shape well after manufacture
Dimensionally stable after seasoning

Nailing

Pre-Boring Recommended
Poor to Very Poor Results
Unsuitable for Nailing
Splits severely and readily
Pre-boring recommended

Planing

Fair to Good Results
Fairly Difficult to Very Difficult
Interlocked grain may cause some tearing, and a reduced cutting angle of 20 degrees is recommended in planing
Difficult to plane and machine in most operations due to high density
Can be planed to a smooth finish

Resistance to Impregnation

Resistant heartwood
Resistant sapwood
Permeable sapwood
Sapwood is permeable
Extremely resistant to preservative treatment

Response to Hand Tools

Fairly Difficult to Difficult to Work
Fairly difficult to work with hand tools because of its high density and interlocked grain

Routing & Recessing

Fair to Good Results
Fairly Difficult to Very Difficult
Difficult routing operations

Sanding

Fairly Easy to Very Easy
Fair to Good Results
Fair sanding qualities

Screwing

Pre-boring recommended
Poor screwing qualities

Turning

Some tearing of grain
Moderate blunting effect on cutters
Difficult to turn since it is hard, heavy, dense and contains interlocked grain

Veneering Qualities

Suitable for peeling

Steam Bending

Requires support on outer surface
Fair steam bending qualities

Polishing

Surface Preparation
Fair to Good Results
Satisfactory polishing properties

Staining

Rarely stained

Strength Properties

Very heavy
Resists wearing, denting and marring fairly well
Fairly hard
Density=Very high
Compression strength (parallel to grain)=very high
Bending strength in the air-dry condition…very high

It is far superior in strength to either Teak or Hard maple

Numerical Data

Item Green Dry English
Bending Strength 10998 25368 psi
Crushing Strength 1103 1742 psi
Density 52 lbs/ft3
Hardness 1649 lbs
Impact Strength 44 52 inches
Maximum Crushing Strength 5046 9980 psi
Shearing Strength 1673 psi
Static Bending 7652 17144 psi
Stiffness 2049 3387 1000 psi
Toughness 632 inch-lbs
Specific Gravity 0.69 0.75
Weight 59 49 lbs/ft3
Radial Shrinkage 6 %
Tangential Shrinkage 11 %
Item Green Dry Metric
Bending Strength 773 1783 kg/cm2
Crushing Strength 77 122 kg/cm2
Density 833 kg/m3
Hardness 747 kg
Impact Strength 111 131 cm
Maximum Crushing Strength 354 701 kg/cm2
Shearing Strength 117 kg/cm2
Static Bending 538 1205 kg/cm2
Stiffness 144 238 1000 kg/cm2
Toughness 728 cm-kg
Specific Gravity 0.69 0.75
Weight 945 785 kg/m3
Radial Shrinkage 6 %

References
Arno, J. 1988. Shorea spp. – Luan. In A Guide to Useful Woods of the World. Flynn Jr., J.H., Editor. King Philip Publishing Co., Portland, Maine. 1994. Page 329-330.

Chowdhury, K.A. and S.S. Ghosh. 1958. Indian Woods – Their Identification, Properties and Uses, Volume I – Dilleniaceae to Elaeocarpaceae. Published by the Manager of Publications, Delhi, India.

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.

Lauricio, F. M., Bellosillo, S. B., The Mechanical and Related Properties of Philippine Woods, The Philippine Lumber Journal, 12(5):A-H

Limaye, V.D. and B.R. Sen. 1956. Weights and Specific Gravities of Indian Woods. Indian Forest Records (New Series). Timber Mechanics. Volume 1 No. 4. Manager of Publications (Publisher, Delhi.

Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.