Some Commerical Timber of Myanmar (Burma)
PYINKADO
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Botanical Name |
: |
Xylia dolabriformis Benth.
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 |
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Trade Name |
: |
Pyinkado (Burma), lrul
(India), Sakram (Cambodia), Burma Iron Wood, Cam xe (Vietnam).
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The Tree |
: |
Occurs throughout the
country, chiefly in upper and lower deciduous forests and evergreen
forests, often gregariously. It grows to 100-120 ft (30-37 m) in
height and 12 ft (3.7 m) in girth. A clean bole of 40 ft (12 m) is
common.
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| |
The Timber
Colour |
: |
Uniform
reddish-brown with few markings or faintly veined with darker lines.
Often streaky and speckled with gum, that gives it a stickly or oily
feel. Turns to dark reddish-brown with ageing. Without
characteristic odour or taste. Sapwood is pale reddish-white and
narrow. |
|
Grain |
: |
Variable from straight to
broadly interlocked, sometimes wavy. The texture is moderately fine
and even.
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|
Specific Gravity |
: |
0.779 green and 0.816 air
dry .Extremely heavy,72 lb/ft3 (1150 kg/m3 ) green and 56 lb/ft3
(890 kg/m3 ) air dry. |
|
Strength |
: |
A hard and extremely
strong timber possessing high strength properties. |
| Moisture content |
Bending strength |
Mod. of Elasticity |
Compression parallel to grain |
Hardness (Radial) |
Impact Max.drop |
|
(%) |
lbf/in2
(N/mm2) |
1000 lb f/in2. (N/mm2) |
lbf/in2
(N/mm2) |
lb
(kg) |
inches
(mm) |
| 48.6 |
15555 |
2265 |
8015 |
1925 |
43 |
| (48.6) |
(107) |
(15628) |
(55.3) |
(874) |
(109) |
| 10.3 |
20580 |
2530 |
11515 |
2165 |
50 |
| (10.3) |
(142) |
(17457) |
(79.6) |
(983) |
(1270) |
| Movement |
: |
Medium. Shrinkage from
green to oven dry is 3.3% radially and 6.7% tangentially.
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| Seasoning |
: |
Not a readily refractory
timber to season, but may have a tendency to surface check, split
and warp. Air dries slowly but with little degrade. Kiln seasons
satisfactorily with low shrinkage, but hair-checks and warping
may develop during the process.
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| Working Properties |
: |
Hard to saw and work in
all machine processes. It is also hard to work with hand tools.
Sawing green in preferable. It has a severe blunting effect on
cutting edges, but with moderate care a fine, smooth finish can be
obtained. Predrilling is necessary in nailing.
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| Poloshing and Staining |
: |
Takes an excellent and
lasting polish. Very attractive after polishing.
|
| Durability and
Preservation |
: |
Very durable and resistant
to termite attack, but not entirely and immunue and from it. It is
also resistant to marine borers. The heartwood is extremely
resistant to preservative treatment and sapwood is moderately
resistant.
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| Uses |
: |
Suitable for heavy,
structural work, especially as piles, bridge girders, harbour work,
and wharf decking.It is an excellent timber both for ground and
water contacted structures. Good to use as posts, beams, scantlings
and framing of high grade houses and public buildings. One of the
best railway sleepers. It makes an attractive and decorative floor
for public buildings and is highly resistant to abrasion . Other
uses are railway wagon construction, telegraph posts cart
wheels,tool handles,boat building and pit props. Pyinkado is
one of the most useful timbers where strength, durability, beauty,
and resistance to wear and tear are required.Large sized timbers are
available. |
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