Clicking any heading in the main data area (at right) will scroll the page back to this top position. Use the following links to jump to the associated section in the main data. Comments Common Names Common Uses Countries of Distribution Drying Defects Ease of Drying Family Name Grain Heartwood Color Kiln Drying Rate Kiln Schedules Light-Induced Color Change Luster Natural Durability Numerical Data Polishing References Regions of Distribution Resistance to Impregnation Response to Hand Tools Sapwood Color Scientific Name Steam Bending Strength Properties Texture Trade Name Tree Size Turning		Scientific Name Aspidosperma quebracho-blanco Trade Name Horco quebracho Family Name Apocynaceae Common Names Horco quebracho, Quebrachillo, Quebracho blanco, Quebracho blanco colorado, Quebracho blanco lloron, Quebraco bianco, Weisse quebrachoholz, White quebracho Regions of Distribution Latin America Countries of Distribution  [VIEW MAP] Argentina, Brazil, Paraguay Common Uses Charcoal, Chemical derivatives, Flooring, Fuelwood, Furniture, Heavy construction, Joinery, Light construction, Mine timbers, Poles, Railroad ties, Tool handles, Turnery, Vats, Vehicle parts Heartwood Color Yellow Brown Red Pink Orange Yellow to golden-yellow to orange Pale red to pink Red Brown Sapwood Color Brown Yellow Same as heartwood Grain Figure Interlocked Other (figure) Distinct (figure) Other figure Interlocked Distinct figure Texture Fine Medium Fine Medium Luster Medium Lustrous Natural Durability Durable Perishable Moderately durable Non-durable Non-resistant to powder post beetles Susceptible to insect attack Durable Moderately durable Susceptible to attack from powder post (Lyctid & Bostrychid) beetles Resistant to attack from pinworms (ambrosia beetles) Non durable Light-Induced Color Change Lighter Kiln Schedules Dry at a slow speed Drying Defects Distortion Checking Internal Honeycombing Possible Collapse Splitting Moderate twist/warp Moderate surface checking Moderate end spitting Moderate collapse and honeycombing Ease of Drying Moderately Difficult to Difficult Slowly Difficult Kiln Drying Rate Naturally dries slowly Tree Size Trunk diameter is 100-150 cm Tree height is 20-30 m Tree height is 30-40 m Bole length is 10-20 m Comments General finishing qualities are rated as good Resistance to Impregnation Resistant heartwood Resistant sapwood Heartwood is resistant Heartwood is moderately resistant Response to Hand Tools Easy to Work Fairly Difficult to Difficult to Work Easy to machine Difficult to machine Turning Fairly Easy to Very Easy Easy to turn Steam Bending Fair to Good Results Good Polishing Very Good to Excellent Results Fair to Good Results Good results Strength Properties 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 Numerical Data 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 % Item Green Dry Metric Bending Strength 654 1024 kg/cm2 Density 849 kg/m3 Maximum Crushing Strength 275 449 kg/cm2 Stiffness 71 84 1000 kg/cm2 Weight 833 673 kg/m3 Radial Shrinkage 5 % References 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 Research Celulosa Argentina,1973,Libro del Arbol,Celulosa Argentina Buenos Aires 3 Vols Kribs, 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 Laboratory Record, S.J., Hess, R.W.,1943,Timbers of the New World,Yale University Press Record, S.J., Mell, C.D.,1924,Timbers of Tropical America,Yale Univ. Press Tortorelli, L.,1956,Maderas y Bosques Argentinos,Editorial Acme S.A.C.I. Buenos Aires Woods, R.P.,1949,Timbers of South America,TRADA, Red Booklet Series