Fir
Denominación científica:
Picea abies Karst
Procedencia geográfica:
Center, south and north of Europe.
- Sapwood: yellowish white.
- Heartwood: reddish yellow.
- Fiber: right.
- Grain: from medium to small size.
- Characteristic defects: it has many small, healthy, and lively knots.
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Impregnabilidad
- Sapwood: low capacity of being impregnated.
- Heartwood: no capable of being impregnated.
Propiedades mecánicas
- Resistance to static flexion: 710 kg/cm2
- Elasticity module: 110,000 kg/cm2
- Resistance to compression: 450 kg/cm2
Mecanización
- Sawing process: easy and with no difficulties.
- Drying process: fast, with risk to crack formation.
- Planing process: no difficulties.
- Gluing process: good.
- Nailing and screwing process: tendency to crack formation. Little resistance to be pulled away.
Propiedades físicas
- Apparent density at 12% humidity 450 kg/m3 light wood.
- Dimensional stability
- - Volumetric contraction coefficient 0.44 % stable wood.
- - Relation between contractions 2.1% bending tendency.
- Hardness (Chaláis-Meudon) 1.5 softwood .
Observaciones
- Fusta de creixement lent
- Fusta poc impregnable, quan es fa el tractament autoclau s'aconsegueix la classe 3 com a màxim.
