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Horco quebracho
Horco quebracho (Aspidosperma quebracho-blanco)

Family: Apocynaceae

Common names: Horco quebracho, Quebrachillo, Quebracho blanco, Quebracho blanco colorado, Quebracho blanco lloron, Quebraco bianco, Weisse quebrachoholz, White quebracho

Distributed in: Argentina, Brazil, Paraguay (Latin America)

Common uses: Charcoal, Chemical derivatives, Flooring, Fuelwood, Furniture, Heavy construction, Joinery, Light construction, Mine timbers, Poles, Railroad ties, Tool handles, Turnery, Vats, Vehicle parts

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodSame as heartwood, Yellow.The grain isOther figure, the textureMediumand the lusterMedium

Natural durability: Susceptible to attack from powder post (Lyctid & Bostrychid) beetles, Susceptible to insect attack

LightInduced Color Change: Lighter

Kiln Schedules: Dry at a slow speed

Kiln Drying Rate: Naturally dries slowly

Drying Defects: Moderate twist/warp, Splitting

Ease of Drying: Slowly

Comments: General finishing qualities are rated as good

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Steam bending: Good

Turning: Fairly Easy to Very Easy

Polishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 849 kg/m3
Bending Strength 654 1024 kg/cm2
Crushing Strength 275 449 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 71 84 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 5 %
Weight 833 673 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9310 14566 psi
Density 53 lbs/ft3
Maximum Crushing Strength 3916 6397 psi
Stiffness 1017 1199 1000 psi
Weight 52 42 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 9 %

Shrinkage, Tangential = large
Shrinkage, Tangential = fairly large
Density (dry weight) = 61-67 lbs/cu. ft
Density (dry weight) = 53-60 lbs/cu. ft
Shrinkage, Tangential = moderate
Shrinkage, Radial = moderate
Shrinkage, Radial = large
Shrinkage, Radial = fairly large
Modulus of Elasticity (stiffness) = very low
Max. crushing strength = medium
Density (dry weight) = 46-52 lbs/cu. ft.
Density (dry weight) = 38-45 lbs/cu. ft.
Bending strength (MOR) = medium

Berni, C.A., Bolza, E., Christensen, F.J.,1979,South American Timbers - The Characteristics, Properties and Uses of 190,Species,C.S.I.R.O Div. Building ResearchCelulosa Argentina,1973,Libro del Arbol,Celulosa Argentina Buenos Aires 3 VolsKribs, D.A.,1950,Commercial and Foreign Woods on the American Market (a manual to their,structure, identification, uses and distribution,U.S.A. Penn. State College, Tropical Woods LaboratoryRecord, S.J., Hess, R.W.,1943,Timbers of the New World,Yale University PressRecord, S.J., Mell, C.D.,1924,Timbers of Tropical America,Yale Univ. PressTortorelli, L.,1956,Maderas y Bosques Argentinos,Editorial Acme S.A.C.I. Buenos AiresWoods, R.P.,1949,Timbers of South America,TRADA, Red Booklet Series
*Come interpretare i dati (manleva su eventuali imprecisioni)