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Ebony
(Diospyros spp)
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| Common
Names: |
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Mgiriti
Msindi
Omernowa
Kanran
Nyareti
Kukuo
Gaboon
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- Mechanical Values
| Category |
Green |
Dry |
Units |
| Weight |
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| Density
(air-dry) |
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| Specific
Gravity |
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| Hardness |
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| Stiffness |
|
2560 |
1000
psi |
| Bending
Strength |
27400 |
21200 |
psi |
| Shearing
Strength |
|
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| Max.
Crushing Strength |
13350 |
9350 |
psi |
| Work to
Maximum Load |
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| Radial
Shrinkage (G->OD) |
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| Tangential
Shrink. (G->OD) |
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| Volumetric
Shrink (G->OD) |
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- Distribution
- Commercial supplies
are mostly from Equartorial West Africa. Forms
almost pure groups near riverbanks.
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- May attain height of
50 to 60 ft with a trunk diameter of about 2 ft.
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- General
Characteristics
- Heartwood uniform jet
black or black brown or streaked; sapwood pink
colored when freshly cut, darkening to a pale red
brown, very variable in width. Texture very
fine; grain straight to slightly interlocked or
somewhat curly. Sawdust may cause dermatitis.
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- Weight
- Basic specific
gravity (oven-dry weight/green volume) about 0.82;
air-dry density 63 pcf.
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- Drying and
Shrinkage
- In small dimensions
dries fairly rapidly with little tendency to check
or warp, may split in log form. Kiln schedule
T6-D2 is suggested for 4/4 stock and T3-D1 for 8/4.
Shrinkage green to 12% moisture content : radial
about 5.5%; tangential about 6.5%.
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- Working Properties
- Heartwood difficult
to work with hand and machine tools, has a
pronounced dulling effect on tool edges, may pick up
in planing if grain is irregular, takes an excellent
polish. Good steam-bending properties.
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- Durability
- Heartwood rated as
very durable, moderately to highly resistant to
termite attack.
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- Preservation
- Heartwood
extremely resistant; sapwood moderately resistant to
permeable.
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