|
| Diameter: |
from 70 to 120 cm |
Colour: |
Red brown |
| Thickness of sapwood: |
from 5 to 7 cm |
Sapwood: |
Clearly demarcated |
| Floats: |
no |
Texture: |
Coarse |
| Durability in forest : |
Moderate (treatment |
Grain: |
Straight or interlocked |
| |
recommended) |
Interlocked grain: |
Slight |
| Note: |
Possible wind shakes. |
|
|
| |
Heartwood light red to red brown or purplish red brown. Presence of resin. |
|
|
| PHYSICAL PROPERTIES |
|
MECHANICAL PROPERTIES |
|
| Physical and mechanical properties are based on mature heartwood specimens. These properties can vary greatly depending on |
| origin and growth conditions. |
|
|
|
|
|
| |
mean |
standard deviation |
|
mean |
standard |
| Density *: |
0.79g/cm3 |
0.07 |
|
|
deviation |
| Monnin hardness*: |
4.6 |
0.7 |
Crushing strength *: |
65MPa |
7 |
| Coef of volumetric shrinkage: |
0.54% |
0.08 |
|
|
|
| Total tangential shrinkage: |
10.0% |
1.2 |
Static bending strength *: |
115MPa |
14 |
| Total radial shrinkage: |
5.4% |
0.8 |
Modulus of elasticity *: |
16610MPa |
1313 |
| Fibre saturation point: |
34% |
|
|
|
|
| Stability: |
Moderately stable to poorly stable |
( * : at 12 % moisture content ; 1 MPa = 1 N/mm2 ) |
|
|
| NATURAL DURABILITY AND TREATABILITY |
| Fungi and termite resistance refers to end-uses under temperate climate. |
| Except for special comments on sapwood, natural durability is based on mature heartwood. |
| Sapwood must always be considered as non-durable against wood degrading agents. |
|
|
| Fungi: |
Class 3 - moderately durable |
| * ensured by natural |
| durability (according |
| EN standards). |
|
|
| Dry wood borers: |
Durable; sapwood demarcated (risk limited to sapwood) |
| Termites: |
Class S - Susceptible |
| Treatability: |
3 - poorly permeable |
| Biological hazard class*: |
2 - not in ground contact, under cover (dampness possible) |
| Note: |
This species is listed in the European standard NF EN 350-2. |
| |
Several species are regrouped under the name KERUING of the genus Dipterocarpus and the |
| |
natural durability is variable from one species to another. It is thus recommended to restrict the |
| |
use without preservative treatment for end-uses under biological hazard class 2. |
|
|
| COUNTRIES - LOCAL NAMES |
|
| Countries |
Local names |
|
Countries |
Local names |
|
|
|
| Andaman (islands) |
GURJUN |
|
Germany |
YANG |
|
| Cambodia |
DAU |
|
United Kingdom |
YANG |
|
| India |
GURJUN |
|
|
|
|
| Indonesia |
KEROEING |
|
|
|
|
| Indonesia |
KERUING |
|
|
|
|
| Laos |
MAI NHANG |
|
|
|
|
| Laos |
MAI SAT |
|
|
|
|
| Peninsular Malaysia |
KERUING BAJAK |
|
|
|
|
| Peninsular Malaysia |
KERUING BERAS |
|
|
|
|
| Myanmar |
KANYIN |
|
|
|
|
| Myanmar |
YANG |
|
|
|
|
| Philippines |
APITONG |
|
|
|
|
| Sri-Lanka |
HORA |
|
|
|
|
| Thailand |
YANG |
|
|
|
|
| Vietnam |
DAU |
|
|
|
|
| France |
KERUING |
|
|
|
|
|
|
| KERUING |
|
| REQUIREMENT OF A PRESERVATIVE TREATMENT |
|
|
| Against dry wood borer attacks: |
Does not require any preservative treatment |
| In case of temporary humidification risk: |
Requires appropriate preservative treatment |
| In case of permanent humidification risk: |
Use not recommended |
|
|
| DRYING |
Possible drying schedule |
|
|
| Drying rate: |
Slow |
|
Temperature (°C) |
Air |
| Risk of distortion: |
High risk |
M.C. (%) |
dry-bulb |
wet-bulb |
humidity (%) |
| Risk of casehardening: |
No |
|
| Risk of checking: |
High risk |
|
| Risk of collapse: |
No |
30 |
42 |
41 |
94 |
| |
25 |
42 |
39 |
82 |
| |
20 |
48 |
43 |
74 |
| |
15 |
48 |
43 |
74 |
|
| This shedule is given for information only and is applicable to thickness < 38 mm. |
| It must be used in compliance with the code of practice. |
| For thickness from 38 to 75 mm , the air relative humidity should be increased by 5 % at each step. |
| For thickness over 75 mm , a 10 % increase should be considered. |
| Note: |
Moisture content very variable especially for the most resinous species. Careful stacking and end |
| |
ating are recommended. |
|
|
| Blunting effect: |
High |
| Sawteeth recommended: |
Stellite-tipped |
| Cutting tools: |
Tungsten carbide |
| Peeling: |
Good |
| Slicing: |
Not recommended or without interest |
| Note: |
Variable silica content. Some species are very resinous and tend to clog tools. Occasional tearing |
| |
on quartersawn. |
|
|
| Nailing / Screwing: |
Good but pre-boring necessary |
| Gluing: |
Correct |
| Note: |
Gluing must be done with care due to the presence of resin. |
|
|
| END-USES |
| Main known end-uses; they must to be implemented according to the code of practice. |
| Important remark: some end-uses are mentionned for information (traditional, regional or ancient end-uses). |
|
|
| Note: |
Plywood for light woods. Resin and shakes may restrict end-uses. In Asia, this species is used for |
| |
sleepers and poles with a treatment. |
|
|
| Flooring |
| Stairs (inside) |
| Vehicle or container flooring |
| Heavy carpentry |
| Wood frame house |
| Exterior joinery |
| Interior joinery |
| Interior panelling |
| Exterior panelling |
| Bridges (parts not in contact with water or ground) |
| Ship building (planking and deck) |
| Veneer for interior of plywood |
| Veneer for back or face of plywood |
| Boxes and crates |
|
| |
