Cumaru
Denominación científica:
Dipterix spp
Procedencia geográfica:
Central America and north of the Amazone.
- Sapwood: white yellowish.
- Heartwood: brown yellowish to brown redish.
- Fiber: straight, usually quite cross.
- Grain: medium size.
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Impregnabilidad
- Sapwood: medium capacity of being impregnated.
- Heartwood: low capacity of being impregnated.
Propiedades mecánicas
- Resistance to static flexion 1.780 kg/cm2.
- Elasticity module 220,000 kg/cm2.
- Resistance to parallel compression 680 kg/cm2.
Mecanización
- Sawing process: difficult due to its hardness and its silica content, high power saws are required.
- Drying process: very slow. Little risk of cimentation. High risk of crack formation and lower risk of deformations.
- Planing process: difficult due to its hardness, risk of generalized risk of repelling due to its intertwined fibers pieces. Slow mechanisation is highly recommended.
- Gluing process: difficulties can arise due to its tannin contents.
- Nailing and screwing process: difficulties due to its hardness. Pre-drilling is required.
- Finish: a thorough sanding is required due to the risk of repelling.
Propiedades físicas
- Apparent density at 12% humidity 1,020 kg/m3 very heavy wood.
- Dimensional stability
- - Volumetric contraction coefficient 0.49 % nervous wood.
- - Relation between contractions 1.4% no tendency to deformity.
- Hardness (Chaláis-Meudon) 11.0 very hard wood .
Observaciones
- És la fusta de Sud-américa semblant al Talí-Elondo africà. Espècie molt adequada para Deck d'exteriors, un bon substitut del Ipé i amb freqüència és confós amb aquest
