Description
INTRODUCTION
Nyatoh is a Light Hardwood of the family Sapotaceae. The sapwood is lighter in colour and is only moderately sharply differentiated from the heartwood, which is deep pink-red or red-brown.
Also known as Nyatoh (Brunei); Chorni (Cambodia); Bauvudi (Fiji); Mahua, Pali and Tali (India); Chonte, Nyatoh and Nyatuh (Indonesia); Jambadung (Laos); Kanzwe (Myanmar); Pencil cedar (Papua New Guinea); Alakaak, Kalipaya, Long-leafed nato, Malak-malak, Maniknik, Mindanao nato, Nato, Palak-palak, Red nato, Tagatoi and Tipurus (Philippines); Kirihembiliya and Tawenna (Sri Lanka); and Chik Nom, Chik-khao, Phikun-nok, Phikun-pa, Phikun-thuan and Tabun Dam (Thailand).
USES
Nyatoh is a very popular timber for furniture and solid door. It is suitable for high class decorative works and interior finishing such as paneling, mouldings and partitioning. Other uses include joinery, flooring, decking, staircase (angle block, rough bracket, baluster, balustrade, carriage, handrail, riser, stringer, tread, bullnose, round end and winder), columns (light duty), plywood, pallets, beams, rafters, joists (light duty), door and window frames and sills (internal use only), vehicle bodies (planking), ship and boat building, railway sleepers and tool handles.
SHRINKAGE
The shrinkage of nyatoh is summarised below:
|
Species |
Shrinkage (%) |
Remarks |
|
|
Radial |
Tangential |
||
| Madhuca motleyana |
2.4 |
3 |
Fairly high shrinkage |
|
Palaquium gutta |
1 |
1.9 |
Fairly low shrinkage |
|
P. hispidum |
1.3 |
2.8 |
Fairly high shrinkage |
|
P. impressinervium |
3 |
3.6 |
High shrinkage |
|
P. maingayi |
2.3 |
4.3 |
Very high shrinkage |
STRENGTH PROPERTIES
Most species of nyatoh falls into Strength Groups B and C (Burgess, 1958). However, P. impressinervium falls into Strength Group A (Burgess, 1958). Nyatoh is also classified under SG 5 (MS 544:Part 2:2001).
Strength Properties of Nyatoh
|
Species |
Test Condition |
Modulus of Elasticity(MPa) |
Modulus of Rupture(MPa) |
Compression parallel to grain (MPa) |
Compression perpendicular to grain (MPa) |
Shear strength(MPa) |
| Ganua motleyana |
Green |
9,800 |
50 |
24.8 |
– |
– |
|
Air dry |
– |
– |
– |
– |
– |
|
| Palaquium gutta |
Green |
11,300 |
64 |
34.3 |
– |
9.2 |
|
Air dry |
12,200 |
79 |
44.5 |
– |
11.0 |
|
| P. hispidum |
Green |
10,600 |
60 |
29.9 |
3.17 |
7.6 |
|
Air dry |
– |
– |
– |
– |
– |
|
| P. impressinervium |
Green |
17,000 |
97 |
53.7 |
6.07 |
11.7 |
|
Air dry |
18,300 |
129 |
64.7 |
9.17 |
11.9 |
|
| P. maingayi |
Green |
11,700 |
63 |
33.7 |
4.21 |
8.1 |
|
Air dry |
– |
– |
43.5 |
4.48 |
11.0 |
Sizes
- Thicknesses of 25mm, 35mm, 50mm, 75mm, 100mm
- Widths of 25mm, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm
- Lengths of 3-6ft & 8ft and up
Characteristics
Density
- Light Hardwood
- 400-1,075 kg/m3 air dry
Durability
- Durable
Speciality
- Beautiful streaks and patterns