Timbers of Kerala

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Scientific Name  Hevea braziliensis (H.B.K) M.-A.
Trade Name  Rubber
Local Name  Rubber
Family  Euphorbiaceae
Tree Size  Large
Tree Height ( m )  20
Tree Diameter ( cm )  40 - 70
Tree Distribution  Native in South America, raised extensively in plantations
Sapwood-Heartwood Distinction  Not distinct
Sapwood Colour  Yellowish white or pale white
Heartwood Colour  Yellowish white or pale white
Hardness  Moderately hard
Specific Gravity Based on Weight Over-dry and Volume Green  0.91
Weight  Light to moderately heavy
Weight(Kg)/cubic meter at 12% Moisture Content  526
Texture  Medium coarse textured
Grain  Straight grained
Growth Rings  Distinct
Porosity  Diffuse porous
Vessel Size  Small to medium sized
Vessel Arrangement  Solitary and in radial multiples of two to three
Vessel Diameter   110 - 260 185
Vessel Element Lenght  240 - 750 750
Perforation  Simple
Pit Outline  Oval to circular
Pit Size  Large(7-14 Ám),non-vestured
Vessel Ray Pitting  Larger with much reduced border
Ray Nature  Moderately broad, numerous and fairly closely spaced
Ray Arrangement/Type  1-4 seriate,heterogeneous type-II,showing a tendancy to homogeneity.body of ray made up of procumbent cells and 2-4 marginal row of square or upright cells.Uniseriate rays made wholly of square or upright cells
Ray Number  7 - 11
Ray Height  240 - 830 515
Fibre Walls  Thin to thick walled,non-septate with minute, simple pits on radial walls
Fiber Length 
Modulus of Rupture in kg/cm2 (Green)  437
Modulus of Elasticity in kg/cm2 (Green)  55600
Modulus of Rupture kg/cm2 (Dry)  756
Modulus of Elasticity in kg/cm2 (Dry)  82000
Uses  Packing cases and boxes, fireboard, particleboard and low quality furniture.
  • Tree Image
  • Timber Gross View
  • T S (100X)
  • T L S (100X)
  • R L S (100X)

College of Forestry - KAU