Chi-viri (Pterocarpus antunesii)
Family: Leguminosae
Common names: Chi-viri, Chivili, M'wangura, Mukambo, Mwangula, Mwangura, Mzundalima
Distributed in: Zambia, Zimbabwe (Africa)
Common uses: Agricultural implements, Boat building (general), Flooring, Flooring: industrial heavy traffic, Fuelwood, Handles: general, Heavy construction, Joinery, Ladders, Mine timbers, Oars, Plywood, Posts, Railroad ties, Sporting Goods, Tool handles, Toys, Turnery, Vehicle parts, Walking sticks, Wheel spokes
Environment profile: Rare
Tree size: Tree height is 30-40 m
Colors: the heart isWhite, Yellow to golden-yellow to orangeand the sapwoodSame as heartwood, White.The grain isWeak figure, the textureFine to mediumand the lusterHigh
Natural durability: Perishable, Susceptible to attack from powder post (Lyctid & Bostrychid) beetles
Drying Defects: Discoloration
Ease of Drying: Reconditioning Treatement
Tree Identification: Bole/stem form is straight
Boring: Poor to very poor results
Carving: Poor to Very Poor Results
Cutting Resistance: Easy to saw
Mortising: Poor to Very Poor
Moulding: Poor to Very Poor
Movement in Service: Poor to Very Poor
Nailing: Holds nails well
Planing: Poor to Very Poor
Resistance to Impregnation: Heartwood is resistant
Response to hand tools: Responds Readily
Routing recessing: Poor to Very Poor Results
Screwing: Screwing yields satisfactory results
; Turning: Poor to Very Poor Results
Painting: Satisfactory; Polishing: Satisfactory; Varnishing: Satisfactory
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- Numerical data Metric
- Numerical data English
- Strength properties
- References
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 |
 |
 |
Item |
Green |
Dry |
Metric |
Specific Gravity |
|
|
|
Density |
|
785 |
kg/m3 |
Bending Strength |
654 |
1024 |
kg/cm2 |
Crushing Strength |
275 |
449 |
kg/cm2 |
Hardness |
|
1333 |
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
223 |
kg/cm2 |
Stiffness |
95 |
110 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
2 |
|
% |
Weight |
769 |
608 |
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
|
|
cm-kg |
Static Bending |
|
|
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | 9310 | 14566 | psi | Density | | 49 | lbs/ft3 | Hardness | | 2940 | lbs | Maximum Crushing Strength | 3916 | 6397 | psi | Shearing Strength | | 3185 | psi | Stiffness | 1358 | 1568 | 1000 psi | Weight | 48 | 38 | lbs/ft3 | Radial Shrinkage | 2 | | % | Tangential Shrinkage | 5 | | % | |
Density (dry weight) = 46-52 lbs/cu. ft. Shrinkage, Tangential = very small Shrinkage, Radial = very small Density (dry weight) = 53-60 lbs/cu. ft. Shrinkage, Tangential = small Shrinkage, Radial = small Shearing strength (parallel to grain) = very high Modulus of Elasticity (stiffness) = low Max. crushing strength = medium Hardness (side grain) = very hard Bending strength (MOR) = medium
Banks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchChalk, L., et al,1932,Some East African Coniferae and Leguminosae,Forest Trees and Timbers of the British Empire,Part 1Fanshawe, D.B.,1962,Fifty Common Trees of Northern Rhodesia,Natural Resources Board and Forestry Department, NdolaStorrs, A.E.G.,1979,Know your Trees - Some of the Common Trees found in Zambia,Zambia Forestry Department, NdolaTimber Information Assoc. Ltd.,1947,Notes on East African Timbers,TRADA, Timber Information, No.28White, F.,1962,Forest Flora of Northern Rhodesia,O.U.P. London
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