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Mertas
Mertas (Ctenolophon parvifolius)

Family: Linaceae

Common names: Mertas

Distributed in: Indonesia, Malaysia, Thailand (Oceania and S.E. Asia)

Distribution overview: Sumatra, Borneo and the Malay Peninsula. It is commonly found in the forests of the south, and northwards on the west coast of the Thailand border, generally found scattered in the lowland and hill forests.

Common uses: Bridge construction, Building construction, Construction, Piling, Poles, Shipbuilding, Wharf construction

Environment profile: Status has not been officially assessed

Tree size: Bole length is 10-20 m The trees are reported to grow to medium size

Colors: the heart isPurple, Redand the sapwoodPink, Red.The grain isInterlocked, the textureMedium

Natural durability: Perishable, Susceptible to insect attack

Drying Defects: Checking, Distortion

Ease of Drying: Moderately Difficult to Difficult

Comments: Corrosive Properties The wood is reported to contain chemicals that may stain and corrode textiles and iron-containing compounds under damp conditions, but they are controllable

Blunting Effect: Blunting effect on machining is moderate

Cutting Resistance: Moderate to saw

Nailing: Difficult to nail

Planing: Hardly distinguishable from heartwood Requires tipped cutters in planing and other machining operations for best

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work


Polishing: Satisfactory; Staining: Stains well ;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,68
Density 913 kg/m3
Bending Strength 1000 1218 kg/cm2
Crushing Strength 492 615 kg/cm2
Hardness 994 kg
Impact Strength 91 106 cm
Shearing Strength kg/cm2
Stiffness 157 180 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load 0,7 0,98 cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 14223 17336 psi
Density 57 lbs/ft3
Hardness 2192 lbs
Impact Strength 36 42 inches
Maximum Crushing Strength 6999 8751 psi
Stiffness 2234 2571 1000 psi
Work to Maximum Load 10 14 inch-lbs/in3
Specific Gravity 0.68
Weight 68 56 lbs/ft3

Resists denting and marring
Heavy
Density (dry weight) = 75+ lbs/cu. ft.
Bending strength (MOR) = very high
Much stronger than Teak in the air-dry condition (about 12 percent moisture content). Maximum crushing strength, or compression parallel to grain in the air-dry condition, is in the very high range. It is stronger than Hard maple, White oak, or Teak. It is hard - harder than Hard maple or Teak

Desch, H. E. 1954. Manual of Malayan Timbers - Volume II. Malayan Forest Records, No. 15. Malaya Publishing House Ltd., Singapore.
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