Douglas fir

  • Pseudotsuga menziessi Franco
  • English: Oregon pine, Douglas fir; Douglas
  • Northamerica (introduced in Europe, Australia, New Zeland)

Description

Sapwood: Pale shade yellow
Heartwood: yellowish brown
Fiber: Straight
Grain: medium size to rough
Characteristic defects: thick and adhesive Knots

Applications

Country and young style interor and exterior furniture
Interior and exterior carpentry.
Hollow carpentry and paneling, interior and exterior. Doors, windows, friezes
Decorative panels and plywood board

Capacity of being impregnated

Sapwood: From medium to low capacity of being impregnated
Heartwood: No capable of being impregnated

Mechanization

Sawing process: Easy and with no difficulties
Drying process: Easy. Low risk of crack formation.
Planing process: Easy and with no difficulties
Gluing process: Easy
Nailing and screwing process: No difficulties. Resistance to be pulled away.
Finish: No difficulties, although a blending agent should be applied in order to homogenize wood

Physical properties

Apparent density at 12% humidity
510 kg/m3 semi-light wood
Dimensional stability
- Volumetric contraction coefficient 0,41% stable wood
- Relation between contractions 1,59% no tendency to deformity
Hardness (Chaláis-Meudon) 2,45 Semi-softwood

Mechanical properties

Resistance to static flexion 860 kg/cm2 &;8226; Elasticity module 128,000 kg/cm2
Resistance to compression 525 kg/cm2
Resistance to parallel traction 930 kg/cm2

Observations

The Sapwood has a very different colour


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