7,000 board feet Available for immediate shipment
8/4 x 6" to 8 " wide, 6' to 9' long
$3.75 /bdft 500 bdft minimum
Arariba Porcupine Wood
Other Common Names: Amarillo guayaquil (Panama,
Ecuador), Guayacan hobo, Balaustre (Colombia, Venezuela), Ararauba,
Ararauva (Brazil), Morosimo (Paraguay).
Distribution: Five or six species of rather infrequent
occurrence from Panama to Ecuador and southern Brazil.
The Tree: A medium-sized to large well-formed tree;
generally up to 100 ft high with diameters of 30 to 50 in.; commonly
to heights of 40 ft and diameters to 16 in. Narrow buttresses to
heights of 3 ft in some species.
General Characteristics: Heartwood yellow or orange,
typically variegated, sometimes "rainbow hued," usually
changing to red or brown; rather sharply demarcated from the yellowish
Luster medium to high; texture fine to rather coarse; grain straight
to irregular; some species without odor or taste, others with distinctive
odor and sometimes with perceptive taste.
Weight: Basic specific gravity (ovendry weight/green
volume) varies with species from 0.61 to 0.69; air-dry density 46
to 53 pcf.
Mechanical Properties: (First set of data based
on 2-cm standard, second set on 1-i standard, and third on 2-in.
Moisture content Bending strength Modulus of elasticity Maximum
crushing strength (%) (Psi) (1,000 psi) (Psi) Green (30) 14,200
15% 16,800 NA 7,900 12% (24) 18,600 2,130 9,550
12% (44) 17,200 2,440 NA Janka side hardness 1,030 lb for dry wood.
Amsler toughness 288 in.-lb at 15% moisture content (2-cm specimen).
Drying and Shrinkage: Reported to have a moderate
drying rate with little to no warp or checking.
Kiln schedule T6-D2 is suggested for 4/4 stock of C. ochroxylon
and T3-D1 for 8/4. Shrinkage green to ovendry: radial 2.4%; tangential
5.6%; volumetric 8.4%.
Working Properties: The wood is easy to machine
with all tools; finishing very smoothly but there may be some fuzzy
grain on planing of radial surfaces.
Durability: The wood is reported to be highly resistant
to attack by decay fungi, termites and other insects, and marine
Preservation: impregnation with wood preservatives is only moderate
using pressure-vacuum systems, absorption and penetration is negligible
using the open-tank method.
Uses: Heavy construction, railroad crossties, fine
furniture and cabinet work, flooring, ship components (planking,
keel, decking, and trim), turnery, decorative veneers, cooperage.
Additional Reading: (24), (30), (44), (56)
24. Food and Agriculture Organization. 1970. Estudio de preinversión
para el desarrollo forestal de la Guyana Venezolana. Informe final.
Tomo III. Las maderas del area del proyecto. FAO Report
FAO/SF:82 VEN 5. Rome. 30. Instituto de Pesquisas Tecnológicas.
1956. Tabelas de resultados obtidos para madeiras nacionais. Bol.
Inst. Pesqu. téc. São Paulo No. 31.
44. Llach, C.L. 1971. Properties and uses of 113 timber-yielding
species of Panama. Part 3.Physical and mechanical properties of
113 tree species. FO- UNDP/SF PAN/6. FAO, Rome. 56. Record, S.J.,
and R.W. Hess. 1949. Timbers of the new world. Yale University Press,
New Haven, Conn.
From: Chudnoff, Martin. 1984. Tropical Timbers of the World. USDA
Forest Service. Ag. Handbook No. 607.