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Essombo
Essombo (Rauwolfia macrophylla)

Family:

Common names: Essombo

Distributed in: Cameroon (Africa)

Common uses: Balusters, Bedroom suites, Boxes and crates, Building construction, Building materials, Cabinetmaking, Carvings, Casks, Chairs, Chests, Concealed parts (Furniture), Construction, Decorative plywood, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Factory flooring, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Hardboards, Hatracks, Interior construction, Kitchen cabinets, Light construction, Living-room suites, Moldings, Office furniture, Packing cases, Parquet flooring, Plywood, Pulp/Paper products, Pulpwood, Radio - stereo - TV cabinets, Rustic furniture, Stairworks

Environment profile: Status has not been officially assessed

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isRed, Yellowand the sapwoodWhite, Yellow.The grain isTypically straight , the textureMediumand the lusterMedium

Natural durability: Susceptible to termite attack, Very durable

Odor: No specific smell or taste

Kiln Drying Rate: Naturally dries slowly

Drying Defects: Distortion, Splitting

Ease of Drying: Slowly

Comments: The bark and roots of the tree are reported to contain alkaloids and other medicinal substances

Blunting Effect: Slight bluting effect on cutting tools

Boring: Fairly easy to very easy

Carving: Good results

Cutting Resistance: Saws without difficulty

Gluing: Satisfactory gluing properties

Mortising: Responds well to mortising operations

Moulding: Good moulding properties

Movement in Service: Good moulding properties

Nailing: Pre-Boring Recommended, Very Good to Excellent

Planing: good

Resistance to Impregnation: Untreatable

Response to hand tools: Good

Routing recessing: Routing is easy

Sanding: Yields clean surfaces

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Very Good to Excellent Results

Screwing: Poor to Very Poor Results, Pre-boring recommended; Turning: Very Good to Excellent Results

Polishing: Very Good to Excellent; Staining: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density kg/m3
Bending Strength 475 732 kg/cm2
Crushing Strength 237 430 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength 110 kg/cm2
Stiffness 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 6762 10413 psi
Maximum Crushing Strength 3381 6125 psi
Shearing Strength 1568 psi
Stiffness 1210 1406 1000 psi

Max. crushing strength = medium
Compression strength (parallel to grain) = medium
Bending strength (MOR) = medium
Air-Dried condition about 12% moisture content
Lower in bending strength than Mahogany, and much lower than White oak. It is lower in compression strength and maximum crushing strength than teak

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building Research
*Come interpretare i dati (manleva su eventuali imprecisioni)