Timbers of Kerala

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Scientific Name  Grevillea robusta A.Cunn.
Trade Name  Silver oak
Local Name  Silver oak
Family  Proteaceae
Tree Size  Medium to large
Tree Height ( m )  18 - 25
Tree Diameter ( cm )  65
Tree Distribution  An exotic from Australia, widely planted as shade tree in the tea plantations
Sapwood-Heartwood Distinction  Fairly distinct
Sapwood Colour  Greyish white
Heartwood Colour  Light reddish brown
Hardness  Moderately hard
Specific Gravity Based on Weight Over-dry and Volume Green  0.47
Weight  Moderately heavy
Weight(Kg)/cubic meter at 12% Moisture Content  607
Texture  Medium coarse textured
Grain  Straight grained
Growth Rings  Boundaries indistinct or absent
Porosity  Diffuse porous
Vessel Size  Small to medium sized
Vessel Arrangement  Solitary,arranged tangentially, also tangential clusters of two to three vessels present
Vessel Diameter   120 - 220 170
Vessel Element Lenght  195 - 380 380
Perforation  Simple
Pit Outline  Circular
Pit Size  Medium (7-9 Ám),non-vestured
Vessel Ray Pitting  Alternate and pit outline circular
Ray Nature  Broad rays clearly visible with the unaided eye and fine rays not visible even with the hand lens; found in between the broad rays
Ray Arrangement/Type  Heterogenous type-3.Uniseriate rays made wholly of square cells.Broad multiseriate rays 14-17 cells wide.Body of ray made up of procumbent cells with 1 or 2 marginal row of square cells.
Ray Number  2 - 5
Ray Height  1620 - 3210 2180
Fibre Walls  Thin to thick walled,non-septate
Fiber Length 
Modulus of Rupture in kg/cm2 (Green)  395
Modulus of Elasticity in kg/cm2 (Green)  49000
Modulus of Rupture kg/cm2 (Dry)  633
Modulus of Elasticity in kg/cm2 (Dry)  83000
Uses  Building construction, general and decorative plywood, boards and packing cases, drawing and engineering instruments, toys, fuel wood, cooperage, oars, pulp making, shafts and casks.
  • Tree Image
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  • TS (100X)
  • TLS(100X)
  • RLS(100X)


College of Forestry - KAU