Cupiuba

Scientific name: Goupia glabra

 

Other common names:

Bragantina, Cachaceiro, Copiúba, Copiúva, Cupiúba, Cupiúba-rosa, Cupuba, Cutiúba, Peniqueiro, Peroba-bosta, Peroba-do-norte, Peroba-fedida, Peroba-fedorenta, Perobinha, Tento.

 

Tree:

Commercial height: 7.60m; Diameter: (DHB) 54.3cm; (DAB) 52.1 cm; Trunk: straight; Buttress: from low to 2.70m.

 

General characteristics:

Heartwood/sapwood: slightly distinct to indistinct;

Color: light reddish brown (2.5YR 6/4);

Growth rings: slightly distinct;

Grain: interlocked cross;

Texture: medium;

Tangential figure: caused by prominent vascular lines;

Radial figure: in slightly prominent longitudinal bands caused by the grain;

Luster: lacking;

Odor: disagreeable;

Resistance to manual cross-cutting:

hard. Preservation

 

Preservation:

Wood is moderately easy to preserve with creosote (oil-borne) and with CCA (water-borne).

 

Kiln drying:

Slow (14 days) with slight tendency to medium cupping and pronounced warping Schedule used: MILD.

 

Workability/end-uses:

End-Uses: Heavy construction, light construction, boats, paneling and boxes and crates.

 

Test	Planing	Sanding	Turning	Boring
Number of samples	23	23	14	10
Processing	Fair	Easy	Easy	Fair
Finishing	Very bad	Fair	Excellent	Excellent
Surface	Torn	Fuzzy	Good	Good

 

Images

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Phisical Properties:

 

Density(g/cm3)				Shrinkage (%)			Shrinkage Tangential/ Shrinkage Radial
Dry	Green	Basic	12%	Tangential	Radial	Volumetric
0.82	1.13	0.71		8.40	4.50	13.20	1.87

 

Mechanical Properties:

 

State	Static Bending		Compression		Janka Hardness
	Modulus of rupture (kgf/cm2)	Modulus of elasticity (1.000kgf/cm2)	Parallel to the grain	Perpendicular to the grain	Parallel to the grain (kgf)	End to the grain (kgf)
			Maximum compression (kgf/cm2)	Stress at proportional limit (kgf/cm2)
Green	916	117	485	94	778	747
Dry	1340	149	689	148	1019	830

 

State	Tension	Cleavage strenght	Shear	Nail extration
	Perpendicular to the grain	Maximum compression (kgf/cm)	Maximum compression (kgf/cm)	Parallel to the grain (kgf)	End to the grain (kgf)
	Maximum compression (kgf/cm2)
Green	66	73	125
Dry	42	56	148

 

Source: Laboratory of Forest Products - IBAMA-Brasília-Brazil