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Bacurubu
Bacurubu (Schizolobium parahybum)

Family: Leguminosae

Common names: Bacurubu, Bacuruvu, Bandarra, Batsoari, Chapulaltapa, Cuchillal, Faveira, Gambombo, Gavilan, Guanacaste, Guaporuva, Guapuruvu, Judio, Melon, Pachaco, Palo de judio, Palo de picho, Parica, Pashaco, Pau de vintem, Plumajillo, Quam, Quamwood, Quon, Sora, Tambor, Tzementi, Zorra

Distributed in: Belize, Bolivia, Brazil, Colombia, Ecuador, Guyana, Mexico, Peru (Central America, Latin America)

Common uses: Boat building (general), Boxes and crates, Cabinetmaking, Canoes, Concrete formwork, Food containers, Furniture, Heavy construction, Joinery (external): ground contact, Joinery, Matches, Plywood, Pulp/Paper products, Toys, Turnery, Veneer

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodWhite to yellow, Yellow.The grain isStraight, the textureMedium to coarseand the lusterSlightly lustrous

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

Kiln Schedules: Drying (speed) is fast

Kiln Drying Rate: Drying rate is slow

Drying Defects: No twisting or warping, Slight collapse and honeycomb

Ease of Drying: Variable

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Blunting Effect: Blunting effect on sawing dry wood is mild

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Easy to saw

Gluing: Easy to glue

Mortising: Finishes well

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Poor to Very Poor , Very Good to Excellent

Planing: Planes well, to a good finish

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Variable qualities

Routing recessing: Routing yields good results

Sanding: Good sanding finish

Veneering qualities: Veneers easily, Veneers moderately easy

Screwing: Easy to screw, Poor results; Turning: Poor results

Polishing: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 368 kg/m3
Bending Strength 208 307 kg/cm2
Crushing Strength 65 125 kg/cm2
Hardness 205 kg
Impact Strength cm
Shearing Strength 62 kg/cm2
Stiffness 80 94 1000 kg/cm2
Tangential Shrinkage 7 %
Radial Shrinkage 4 %
Weight 368 304 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 2959 4369 psi
Density 23 lbs/ft3
Hardness 454 lbs
Maximum Crushing Strength 926 1789 psi
Shearing Strength 882 psi
Stiffness 1147 1343 1000 psi
Weight 23 19 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 7 %
Volumetric Shrinkage 11 %

Bending strength (MOR) = very low
Max. crushing strength (stiffness) = very low
Shearing strength (parallel to grain) = very low
Modulus of Elasticity (stiffness) = very low
Hardness (side grain) = very soft
Density (dry weight) = 23-30 lbs/cu. ft.
Density (dry weight) = 15-22 lbs/cu. ft.
Shrinkage, Volumetric = moderate
Shrinkage, Tangential = moderate
Shrinkage, Radial = moderate
Modulus of Elasticity (stiffness) = medium
Max. crushing strength = low
Hardness (side grain) = soft
Bending strength (MOR) = low

Almeida, D.G. de, Costa, J.R. da,1956,Madeiras do Brasil. (Timbers of Brazil.,Min. Ag. Servico de Economia Rural, Rio de Janeiro, Brazil,pp56Belize,1946,42 Secondary Hardwood Timbers of British Honduras,British Honduras Forest Department Bulletin,No.1Berni, 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 ResearchMainieri, C., Pereira, J.A.,1965,Madeiras do Brasil,Anuario Brasileiro de Economia Florestal,17(17,PP135-416Mainieri, C.,1970,Madeiras Brasilieras,Sao Paulo Secretaria da Agricultra, Institulo FlorestralMainieri, C.,1973,Madeiras do litoral sul Sao Paulo, Parana e sta.catarina,Sao Paulo Secretaria da Agricultura, Ins. Flor. Bol. Tec no.3Mainieri, C.,1978,Fichas de Caracteristicas das Madeiras Brasileiras,Inst. Pesquisas TechnologicasPennington, T.D., Sarukhan, J.,1968,Manual para la Identificacion de campo de los Principales Arboles,Tropicales de Mexico,Inst. Nac. Inv. For. MexicoPeru - P.A.D.T.,1981,Descripcion general y anatomica de 105 Maderas del Grupo Andino,Junta del Acuerdo de Cartagena, P.A.D.T. Report, Junac, Lima, Peru.Peru - P.A.D.T.,1981,Tablas de propiedades fisicas y mecariicas de la Madera de 24 especies de,Colombia,Junta del Acuerdo de Cartagena, P.A.D.T. Report, Lima, Peru.Record, S.J., Hess, R.W.,1943,Timbers of the New World,Yale University PressRecord, S.J.,1925,Schizolobium: A Promising Source of Pulpwood,Tropical Woods 1(2) pp2-5Record, S.J.,1927,Trees of Honduras,Tropical Woods,10, pp10-47Richter, et al, H.G.,1974,Estudo Technological Guapuruvu (Schizolobium parahybum,Floresta V(1) pp26-30Richter, et al, H.G.,1975,Technological Study of Schizolobium parahybum II Plywood Manufacture,Revista Floresta VI (1) pp14-23Rizzini, C.T.,1978,Arvores e Madeiras Uteis do Brasil: Manual de Dendrologia Brasileira,Editora Edgard Blucher LTDA BrazilSao Paulo - Instituto de Pesquisas Tecnologicas,1956,Tabelas de Resultados obtidos para Madeiras Nacionais,Inst. Pesq. Tec. Sao Paulo, Brazil Bol., No.31(2nd Ed.)Vink, A.T.,1965,Surinam Timbers,Surinam Forest Service Paramaribo,3rd rev. ed.
*Come interpretare i dati (manleva su eventuali imprecisioni)