African crabwood (Carapa grandiflora)
Family: Meliaceae
Common names: African crabwood, Agogo, Alla, Bete, Crabnut, Crabwood, Dona, Gobi, Kowi, Krupi, Muhumbulia, Mujogo, Mutongana, Omuruguya, Toon-kor-dah, Uganda crabwood
Distributed in: Angola, Uganda, Zaire (Africa)
Common uses: Boxes and crates, Cabinetmaking, Flooring, Furniture, Heavy construction, Joinery, Light construction, Mine timbers, Paneling, Poles
Tree size: Trunk diameter is 150-200 cm
Colors: the heart isReddish brown, Yellow to golden-yellow to orangeand the sapwoodDifferent than heartwood, Paler than heartwood.The grain isWavy, the textureMedium coarse to coarseand the lusterPronounced
Natural durability: Susceptible to insect attack, Very durable
Silica Content: Siliceous
Kiln Drying Rate: Naturally dries quickly
Drying Defects: Distortion, Moderate end spitting
Ease of Drying: Rapidly
Tree Identification: Bole/stem form is straight
Comments: General finishing qualities are rated as good
Blunting Effect: Moderate
Cutting Resistance: Fairly Difficult to Very Difficult to saw
Gluing: Fairly Easy to Very Easy
Nailing: Fairly Easy to Very Easy
Planing: Planes well, to a good finish
Resistance to Impregnation: Resistant sapwood
Response to hand tools: Fairly Difficult to Difficult to Work
Veneering qualities: Veneers easily, Veneers moderately easy
Screwing: Fairly Easy to Very Easy
; Turning: Good results
Painting: Fair to Good; Polishing: Very Good to Excellent;
- Numerical data Metric
- Numerical data English
- Strength properties
- References
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Item |
Green |
Dry |
Metric |
Specific Gravity |
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Density |
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624 |
kg/m3 |
Bending Strength |
513 |
800 |
kg/cm2 |
Crushing Strength |
380 |
574 |
kg/cm2 |
Hardness |
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kg |
Impact Strength |
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cm |
Shearing Strength |
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kg/cm2 |
Stiffness |
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1000 kg/cm2 |
Tangential Shrinkage |
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% |
Radial Shrinkage |
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% |
Weight |
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kg/m3 |
Maximum Load |
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cm-kg/cm3 |
Toughness |
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cm-kg |
Static Bending |
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kg/cm2 |
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 |  |  |  | Item | Green | Dry | English | Bending Strength | 7310 | 11382 | psi | Density | | 39 | lbs/ft3 | Maximum Crushing Strength | 5408 | 8171 | psi | Weight | 38 | 31 | lbs/ft3 | |
Density (dry weight) = 38-45 lbs/cu. ft. Bending strength (MOR) = medium Max. crushing strength = medium Max. crushing strength = high Density (dry weight) = 46-52 lbs/cu. ft. Density (dry weight) = 31-37 lbs/cu. ft. Bending strength (MOR) = very low Bending strength (MOR) = low
Bryce, J.M.,1967,Commercial Timbers of Tanzania,Tanzanian Forestry Division Util. Sec. MoshiChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Eggeling, W.J., Harris, C.M.,1939,Fifteen Uganda Timbers,Forest Trees and Timbers of the British Empire, Imperial Forestry,Institute, Oxford,Part 4Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry DepartmentTack, C.H.,1969,Uganda Timbers,Govt. Printer UgandaTakahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7
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