Red aldar (Cunonia capensis)
Family: Cunoniaceae
Common names: Red aldar, Red alder, Red cedar, Red els, Rode els, Rooi-els, Um qwashube, Umnqwashube
Distributed in: South Africa (Africa)
Common uses: Boat building (general), Carvings, Flooring, Food containers, Furniture, Heavy construction, Joinery, Light construction, Millwork, Moldings, Musical instruments, Paneling, Particleboard, Plywood, Poles, Posts, Railroad ties, Sporting Goods, Turnery, Vehicle parts, Wheel spokes
Tree size: Tree height is 40-50 m
Colors: the heart isReddish brown, Yellowand the sapwoodWhite, Yellow.The grain isWeak figure, the textureFine
Natural durability: Susceptible to attack from powder post (Lyctid & Bostrychid) beetles, Susceptible to insect attack
Kiln Schedules: UK=B US=T2C2/T2C1 Fr=2
Kiln Drying Rate: Naturally dries quickly
Drying Defects: Moderate surface checking, Moderate twist/warp
Ease of Drying: Rapidly
Cutting Resistance: Cutting Resistance with dry wood is easy
Gluing: Easy to glue
Mortising: Easy to mortise
Moulding: Easy to mould
Movement in Service: Easy to mould
Nailing: Fair to Good , Very Good to Excellent
Planing: Easy to plane
Resistance to Impregnation: Resistant sapwood
Response to hand tools: Easy to machine
Veneering qualities: Veneers easily, Veneers moderately easy
Screwing: Fair to Good Results, Very Good to Excellent Results; Turning: Fairly Easy to Very Easy
Polishing: Satisfactory;
- Numerical data Metric
- Numerical data English
- Strength properties
- References
|
|
|
|
Item |
Green |
Dry |
Metric |
Specific Gravity |
|
|
|
Density |
|
721 |
kg/m3 |
Bending Strength |
654 |
1024 |
kg/cm2 |
Crushing Strength |
275 |
449 |
kg/cm2 |
Hardness |
|
451 |
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
121 |
kg/cm2 |
Stiffness |
117 |
135 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
5 |
|
% |
Weight |
705 |
560 |
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
|
|
cm-kg |
Static Bending |
|
|
kg/cm2 |
|
| | | | Item | Green | Dry | English | Bending Strength | 9310 | 14566 | psi | Density | | 45 | lbs/ft3 | Hardness | | 995 | lbs | Maximum Crushing Strength | 3916 | 6397 | psi | Shearing Strength | | 1721 | psi | Stiffness | 1665 | 1923 | 1000 psi | Weight | 44 | 35 | lbs/ft3 | Radial Shrinkage | 5 | | % | Tangential Shrinkage | 9 | | % | |
Max. crushing strength = medium Bending strength (MOR) = medium Shearing strength (parallel to grain) = low Modulus of Elasticity (stiffness) = medium Hardness (side grain) = soft Density (dry weight) = 46-52 lbs/cu. ft. Shrinkage, Tangential = large Shrinkage, Radial = large Shrinkage, Tangential = moderate Shrinkage, Tangential = fairly large Shrinkage, Radial = fairly large Shearing strength (parallel to grain) = 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.48Banks, C.H.,1954,The Mechanical Properties of Timbers with Particular Reference to those,grown in the Union of South Africa,Journal of the South African Forestry Association,No. 24 pp.44-65,[South,African Forestry Journal]Banks, C.H.,1970,The Durability of South African Wood and Wood Base Building Materials,South African Forestry Journal,No.75Bolza, 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.,1935,Fifteen South African High Forest Timber Trees,Forest Trees and Timbers of the British Empire, Imperial Forestry,Institute, Oxford,Part 3Scott, M.H.,1935,Weights of South African Growth Timbers,South African Department of Agriculture and Forestry Bulletin,No.145,Forest Products Institute, Forestry Series No.1Scott, M.H.,1948,Timber Seasoning in South Africa,South African Forestry Department South Africa Bulletin No.32Scott, M.H.,1953,Utilisation Notes on South African Timbers,South African Forestry Department Bulletin No.36Sim, T.R.,1921,Native Trees of South Africa,Union of South Africa Department of Mines and Industries Memoir No.3Takahashi, 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
|