Anisoptera Costata (Mersawa)


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Scientific Name
Anisoptera costata

Trade Name
Mersawa

Family Name
Dipterocarpaceae

Common Names
Ansiopi, Armaniuri, Asomba, Bak, Baligan, Baoti, Baripung, Baurai, Berua, Cha wa ta pho, Chengal, Damar kelasi, Damar ketimpun, Damar lilin, Damar mata kuching, Damar miharo, Damar tingkis, Doka, Entenam, Gawi, Jamar, Kabaak khok, Kaban, Kaban kaunghmu, Kakan, Kansiopi, Kaunghmu, Kedao, Kenyau, Ketimpun, Kokadaka, Kora, Kra-bak, Krabak, Krabak daeng, Krabak dam, Mansiuri, Marlangat, Mascalwood, Meranti kawan, Merayo, Merbani, Merlangsat, Merluang lauh, Mersaw daun lebar, Mersawa, Mersawa kesat, Mersawa merah, Mesawa, Mi dang wa, Mindanao, Palosapis, Pedu kalui, Pengiran, Pengirin kesat, Penogran, Perapat hutan, Phdiek, Phdiek kraham, Punyau, Sampean, Sitairak, Suri, Tabaak, Tairak, Taire, Tairi, Tampudau, Tampurau, Tenam, Tukam, Ven van trang, Ven ven, Ven ven xanth, Venven, Vin vin, Von ven, Von-ven, weru

Regions of Distribution
Oceania and S.E. Asia

Countries of Distribution  [VIEW MAP]
Brunei, Burma, Cambodia, India, Indonesia, Laos, Malaysia, Myanmar, Pakistan, Papua New Guinea, Philippines, Thailand, Vietnam

Common Uses
Beams, Boat building (general), Boat building: decking, Boat building: planking, Boxes and crates, Building construction, Building materials, Cabin construction, Cabinetmaking, Canoes, Chairs, Chests, Clogs, Concealed parts (Furniture), Concrete formwork, Construction, Decks, Decorative plywood, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Excelsior, Factory construction, Figured veneer, Fine furniture, Floor lamps, Flooring, Form work, Foundation posts, Framing, Furniture , Furniture components, Furniture squares or stock, Furniture, Handles, Handles: general, Hatracks, Heavy construction, Interior construction, Interior trim, Joinery, Joists, Light construction, Moldings, Particleboard, Plywood, Railroad ties, Tool handles, Toys, Vehicle parts, Veneer, Windows

Environmental Profile

Abundant/Secure
Generally secure within most of its natural habitat, but note exceptions.

Distribution Overview
Usually found in dry evergreen forests, scattered all over the countryside along depressions and along valleys of low hill ranges. Elevation is generally around 500m. Known to occur in Thailand.

Heartwood Color

Yellow
Brown
Orange
Red
Yellow to golden-yellow to orange
Brown
Red
Light buff to yellowish brown
Darkens slightly upon exposure

Sapwood Color

Yellow
White
Brown
White to yellow
Well defined
Same as heartwood
Pale yellow
Not always clearly demarcated from heartwood
Discoloration from sap-stain fungal infection may abnormally define sapwood from heartwood

Normal width is about 2 inches (5 cm).

Grain

Interlocked
Straight
Even
Crossed
Spiral
Figure
Weak (figure)

 

Interlocked
Straight
Weak figure
Spiral grain occasionally
Moderately to severely interlocked
Broad rays produce silver grain on quartersawn surfaces

Texture

Coarse
Medium
Even or uniform
Uniform
Medium to coarse
Coarse
Medium
Even textured

Luster

Medium
Low
Non-lustrous
Lustrous
Dull

Natural Growth Defects

Piped heart is occasionally present in large logs
Gum/resin exudation

Natural Durability

Moderately durable
Susceptible to insect attack
Non-durable
Resistant to marine borers
Non-resistant to powder post beetles
Non-resistant to termites
Perishable
Moderately durable
Non durable
Susceptible to attack from powder post (Lyctid & Bostrychid) beetles
Susceptible to termite attack
Susceptible to attack from termites (Isoptera)
Pinworms (ambrosia beetles) may be present in the felled log
Moderately resistant to marine borer attack
Moderately resistant to attack by marine borers
Moderate weathering properties

Weathering

Good

Odor

No specific taste
Distinctive resinous odor

Silica Content

Siliceous
High
Moderate silica contact
Likely to have significant impact on machining
Contains high levels of silica (> 0.5% of dry weight)

Light-Induced Color Change

Darker

Kiln Schedules

Dry at a slow speed
T6-D4(4/4);T3-D1(8/4) US Schedule E; United Kingdom
Care is needed to accurately measure moisture content for kilning

Drying Defects

Checking
Distortion
Discoloration
Slight twist/warp
Slight surface checking
Wet pockets may also cause uneven variations in drying rate
Susceptible to sap-stain during air-drying
Slight warping and checking may occur during drying

Ease of Drying

Slowly
Fairly Easy
Dries slowly from the green conditin without severe degrade

Kiln Drying Rate

Naturally dries slowly

Tree Identification

Bole/stem form is cylindrical
Bole/stem form is buttressed
Bole/stem form is straight

Tree Size

Tree height is 40-50 m
Trunk diameter is 150-200 cm
Tree height is 60-70 m
Bole length is 20-30 m
Sapwood width is 5-10 cm
Sapwood width is 10-15 cm
Trunk diameter is 100-150 cm
Tree height is 50-60 m
Bark width is 30-40 mm
Bole length is 30-40 m
Tree height is 30-40 m
Bole length is 10-20 m

Product Sources
The ITTO reports that timber production from this species is in low quantities. Exports are more or less regular. Exportation of the timber from Cameroon is prohibited.

Certified Source

Certified Source

Comments
Retards the setting of cement and should not be used for shuttering concrete

Blunting Effect

High to severe
Blunting effect on sawing green wood is severe
Capable of dulling cutting edges rapidly and severely, depending upon silica amount

Cutting Resistance

Fairly Difficult to Very Difficult to saw
Easy to saw
Cutting Resistance with green wood is easy
Fairly difficult to saw
Cutting Resistance with dry wood is difficult

The wood has been found to be fairly difficult to saw especially when interlocked grain is present.

Gluing

Fairly Easy to Very Easy
Fair to Good Results
Easy to glue
Glues well

Moulding

Fair to Good Results
Fairly Easy to Very Easy
Satisfactory moulding results
Very sharp cutting edges are required to produce a smooth surface

Movement in Service

Fair to Good Stability – Medium Movement
Excellent Stability – Small Movement
Stable
Retains shape well after seasoning
Medium
Good dimensional stability and shows little movement in use

Nailing

Fair to Good Results
Very Good to Excellent Results
Fairly Easy to Very Easy
Holds nails well
Good nailing characteristics

Planing

Fair to Good Results
Fairly Difficult to Very Difficult
Fairly Easy to Very Easy
Planes to a satisfactory finish
Reduced cutting angle of 20 degrees is recommended for best results
Planes fairly cleanly
Dulls cutting edges rapidly due to silica content
Difficult to plane

Resistance to Impregnation

Resistant heartwood
Permeable sapwood
Resistant sapwood
Heartwood is resistant
Sapwood is permeable
Resistance to preservative treatment varied from moderate to very resistant

Response to Hand Tools

Responds Readily
Fairly Difficult to Difficult to Work
Easy to Work
Moderate working qualities
Easy to work with hand tools except when interlocked grain is present
Dulls cutting edges rapidly due to silica content

Sanding

Fair to Good Results
Very Good to Excellent Results
Responds well to sanding operations
Produces clean surfaces
Good sanding finish

Screwing

Fairly Easy to Very Easy
Fair to Good Results
Very Good to Excellent Results
Screwing yields satisfactory results
Holds screws well
Easy to screw

Turning

Fairly Easy to Very Easy
Easy to turn

Veneering Qualities

Suitable for peeling
Suitable for slicing
Veneers moderately easy
Veneers easily
Difficult to veneer
Good gluing qualities
No steaming needed during bolt preparation.
Suitable for peeling
Moderately easy to veneer
Drying degrade is moderate to severe, with collapse, buckles, and splits

Steam Bending

Poor to Very Poor Results
Poor steam bending characteristics

Polishing

Fair to Good Results
Very Good to Excellent Results
Good results
Good finishing characteristics
Fairly good polishing characteristics

Staining

Fair to Good Results
Fairly Easy to Very Easy
Stains satisfactorily after surface preparation

Strength Properties

Density (dry weight) = 38-45 lbs/cu. ft.
Density (dry weight) = 31-37 lbs/cu. ft.
Max. crushing strength = medium
Density (dry weight) = 46-52 lbs/cu. ft.
Shrinkage, Radial = small
Shrinkage, Tangential = very small
Shrinkage, Tangential = small
Shrinkage, Tangential = fairly large
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = medium
Modulus of Elasticity (stiffness) = low
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 23-30 lbs/cu. ft.
Bending strength (MOR) = low
Shrinkage, Tangential = moderate
Shrinkage, Radial = moderate
Shearing strength (parallel to grain) = very low
High in density
Heavy
Compression strength (parallel to grain) = high
Bending strength (MOR) = high

It compares favorably with Teak, which also has high bending strength. Some familiar species with high crushing strength parallel to grain include Hard maple, Teak, and White oak

Numerical Data

Item Green Dry English
Bending Strength 6888 10620 psi
Density 40 lbs/ft3
Maximum Crushing Strength 3883 6599 psi
Shearing Strength 1528 psi
Stiffness 1346 1573 1000 psi
Specific Gravity 0.51 0.52
Weight 38 30 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 7 %
Volumetric Shrinkage 15 %
Item Green Dry Metric
Bending Strength 484 746 kg/cm2
Density 641 kg/m3
Maximum Crushing Strength 273 463 kg/cm2
Shearing Strength 107 kg/cm2
Stiffness 94 110 1000 kg/cm2
Specific Gravity 0.51 0.52
Weight 608 480 kg/m3
Radial Shrinkage 3 %
Tangential Shrinkage 7 %

References
Ashton, P.S.,1964,A manual of the Dipterocarp trees of Brunei State,O.U.P. London

Brown, W.H.,1969,Properties and uses of Tropical hardwoods in the United Kingdom. Part 1,Nonstructural properties and uses.,Conference on Tropical hardwoods SC-5/TN-5, Syracuse University

Brown, W.H.,1978,Timbers of the World, No. 4 South East Asia,TRADA, Red Booklet Series

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

Eddowes, P. J. 1961. Commercial Timbers of Papua New Guinea: Their Properties and Uses. Office of Forests, Papua New Guinea.

Eddowes, P.J.,1977,Commercial Timbers of Papua New Guinea: Their Properties and Uses,Hebano Press, Port Moresby, Papua New Guinea

France – C.T.F.T./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. France

Fundter, J.M.,1982,Names for Dipterocarp timbers and trees from Asia,Pudoc, Wageningen, Netherlands

HMSO. 1981. Handbook of Hardwoods, 2nd Edition. revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.

Keating, W.G., Bolza, E.,1982,Characteristics properties and uses of timbers. South East Asia, Northern,Australia and the Pacific,C.S.I.R.O. Div. Chemical Technology,Inkata Press,1

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

Martawijaya, A. (Ed.,1978,Timbers used for the ship building industry in Indonesia,Lembaga Penelitian Hasil Hutan, Bogor, Indonesia, Laporan No.109

Martawijaya, A., Kadir, K., Kartasujana, I.,1986,Indonesian Wood Atlas. Vol.1.,Department of Forestry Agency for Forestry Research and Development.,Bogar-Indonesia

Meijer, W., Wood, G.H.S.,1964,Dipterocarps of Sabah (North Borneo,Sabah Forest Department, Forest Record No.5