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Duru
Duru (Apeiba aspera)

Family: Tiliaceae

Common names: Arastioelan, Borredaballi, Burillo, Corcho, Cortezo, Cortica, Duru, Gargauba, Maqui-sapa, Maquisapa, Peine de mico, Peine de mono

Distributed in: Bolivia, Brazil, Columbia, Costa Rica, Ecuador, Mexico, Nicaragua, Panama, Peru, Suriname (Central America, Latin America)

Distribution overview: Tropical America, predominantly in northern South America (Brazil). Believed to be in Peru as well, often found in dry medium loamy soils.

Common uses: Insulating boards, Raft floats, Rafts

Product sources: The ITTO reports that timber is produced and exported only occasionally from this species.

Environment profile: Status has not been officially assessed

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow, Yellow - light and the sapwoodRed, Yellow.The grain isStraight, the textureMedium to coarseand the lusterRather lustrous

Natural durability: Very little resistance to decay, Vulnerable to attack by the blue-stain or sap-stain fungi, especially in green condition

Odor: No specific smell or taste

Silica Content: Siliceous

Ease of Drying: Seasons rapidly and readily

Blunting Effect: Slight blunting effect on cutters

Boring: Poor to very poor results

Cutting Resistance: Low resistance to cutting

Gluing: Fairly Easy to Very Easy

Mortising: Poor to Very Poor

Moulding: Shaping or moulding is difficult

Movement in Service: Shaping or moulding is difficult

Planing: Smooth surfaces are difficult to achieve due to bands of soft tissue in the wood

Resistance to Impregnation: Very easy to impregnate with preservatives

Response to hand tools: Responds well to hand tools

Routing recessing: Poor to Very Poor Results

Sanding: Fairly difficult to sand

Turning: Poor to Very Poor Results


  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,21
Density 240 kg/m3
Bending Strength 342 kg/cm2
Crushing Strength 209 kg/cm2
Hardness 111 kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 36 1000 kg/cm2
Tangential Shrinkage 6 %
Radial Shrinkage 2 %
Weight 528 240 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 4876 psi
Density 15 lbs/ft3
Hardness 245 lbs
Maximum Crushing Strength 2979 psi
Stiffness 515 1000 psi
Specific Gravity 0.21
Weight 33 15 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 8 %

Soft
Mars easily
Low weight
Low in density
Does not wear well
Compression strength (parallel to grain) = low
Bending strength (MOR) = low
The bending strength of the species in the air-dry condition (about 12 percent moisture content) is considered low - much lower than Teak, for example. Its strength in compression, or maximum crushing strength, is low - lower than that of Mahogany or Teak

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Simpson, W.T. and J.A. Sagoe. 1991. Relative Drying Times of 650 Tropical Woods : Estimation by Green Moisture Content, Specific Gravity, and Green Weight Density.United States Department of Agriculture (USDA, Forest Service, General Technical Report FPL-GTR-71, Forest Products Laboratory, Madison, Wisconsin.Williams, L.1936. Woods of Northeastern Peru.Field Museum of Natural History, Botanical Series, Volume XV, Publication 377, Chicago.
*Come interpretare i dati (manleva su eventuali imprecisioni)