Tawa (Beilschmiedia tawa)
Family: Lauraceae
Common names: Tawa
Distributed in: New Zealand (Oceania and S.E. Asia)
Common uses: Cooperages, Flooring, Furniture, Joinery, Millwork, Paneling, Plywood, Turnery, Veneer
Product sources: The ITTO reports that negligible quantities of timber are produced and exported from this species. Exporting countries include Liberia, Sierra Leone, Ivory Coast, Nigeria, and the Cameroons.
Tree size: Bole length is 10-20 m
Colors: the heart isWhite to cream, Yellow to golden-yellow to orangeand the sapwoodColor not distinct from heartwood, White to yellow.The grain isWavy, the textureMediumand the lusterMedium
Natural durability: Non durable, Susceptible to attack from powder post (Lyctid & Bostrychid) beetles
Silica Content: Moderate silica contact
Drying Defects: Slight surface checking
Ease of Drying: Easy
Blunting Effect: Blunting effect on machining is moderate
Cutting Resistance: Cutting Resistance with dry wood is easy
Gluing: Easy to glue
Nailing: Difficult to nail, Pre-boring recommended
Planing: Ease of planing is moderate
Resistance to Impregnation: Heartwood is permeable
Response to hand tools: Easy to machine
Screwing: Possible if prebored
; Turning: Fairly Easy to Very Easy
Polishing: Satisfactory; Staining: Finish is generally 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 |
|
705 |
kg/m3 |
Bending Strength |
609 |
954 |
kg/cm2 |
Crushing Strength |
296 |
468 |
kg/cm2 |
Hardness |
|
526 |
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
132 |
kg/cm2 |
Stiffness |
108 |
125 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
|
|
% |
Weight |
689 |
544 |
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
|
|
cm-kg |
Static Bending |
|
|
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | 8670 | 13570 | psi | Density | | 44 | lbs/ft3 | Hardness | | 1160 | lbs | Maximum Crushing Strength | 4218 | 6664 | psi | Shearing Strength | | 1883 | psi | Stiffness | 1543 | 1781 | 1000 psi | Weight | 43 | 34 | lbs/ft3 | Volumetric Shrinkage | 11 | | % | |
Density (dry weight) = 46-52 lbs/cu. ft. Density (dry weight) = 38-45 lbs/cu. ft. Bending strength (MOR) = medium Modulus of Elasticity (stiffness) = medium Hardness (side grain) = soft Modulus of Elasticity (stiffness) = low Max. crushing strength = medium Shrinkage, Volumetric = moderate Shearing strength (parallel to grain) = medium Shearing strength (parallel to grain) = low Max. crushing strength = low Max. crushing strength = high Hardness (side grain) = medium Bending strength (MOR) = low
Bier, H.,1983,The strength properties of small clear specimens of New Zealand-grown,timber,New Zealand Forest Service Forest Research Institute, FRI Bulletin No.41Brown, W.H.,1978,Timbers of the World, No. 8 Australasia,TRADA, Red Booklet SeriesChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Farmer, R.H.,1972,Handbook of Hardwoods,HMSOFrance - C.T.F.T./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. FrancePatterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical Press
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