ATIBT Standard Name: Wallaba
Other Name: Bois, Sabre Wapa
gris, Uapa, Apa
Wood Appearance: Heartwood is
red-brown in colour, with gum streaks which tend to spread over
- Sapwood - pale in colour and is sharply defined from
- Texture - coarse.
- Grain - typically straight.
- Bole - 40-60 feet, diameter 18-24 inches.
Physical and Mechanical Properties:
Strength is mid-way between European Beech and Greenheart.
- Weight - 950 kg/m3 (59 lb/ft3 ) seasoned.
- Bending Strength - 104 N6mm2 (15100 lbg/in2)
- Modulus of elasticity - 1500 N/mm2 (2180000 lbft/in2)
- Compression parallel to grain - 57.8 N/mm2 (3380 lb/in2)
- Shock resistance -
Natural Durability: Wallaba
heartwood is highly resistant to decay and to subterranean termites;
fairly resistant to drywood termites. The wear resistance of Wallaba
is extremely high. Wallaba is self-impregnated by nature thus
creosoting is unnecessary.
- Drying - Dries very slowly. Kiln Schedule B.
- Working - Fairly easy to work but difficult to saw because
of the high gum content.
- Assembly - Glues well. Does not take nails and screws satisfactorily:
pre-boring is recommended.
- Finishing - Difficult to paint because of gum exudation, but
stains and polishes satisfactorily. Weathers beautifully.
Uses: Wallaba has excellent
properties for transmission poles, flag staffs, and marine and
bridge construction in non-teredo areas. Owing of its strength
and durabilitv. Wallaba is suitable for general heavy construction,
utility and industrial floors, and chemical vats staves. Also
fence staves, fenceposts and shingles for roofing.
Supplies: Occurs abundantly
in the Guyana Forest. Regular supplies in large volumes are easily