Chatoyance was measured by the chatometry.com team using the PZC method. The statistics for this specific timber are hereby summarized to provide an evaluation of data robustness:
Number of sources for samples: 7
Number of individual trees analyzed: 8
Number of specimens: 16
Number of measurements: 48
Max PZC read (of all measurements): 23.2
Min PZC read (of all measurements): 10.1
Max PZC average on one log: 21.3
Min PZC average on one log: 10.5
PZC Average of all logs: 14.7

Species: dipterocarpus spp.
Family: Dipterocarpaceae
Clade: Angiospermae
Description: Dipterocarpus spp. are large, emergent rainforest trees native to Southeast Asia, characterized by simple leaves and distinctive fruits bearing two prominent wings. They are a significant source of valuable timber.
Other Local Names: Yang, Gurjun, Chloeuteal, Dau, Thbeng, Gurjun, Keroeing, Mai nhang, Mai sat, Keruing bajak, Keruing beras, Keruing gaga, Kanyin, Yang, Apitong, Yang, Hora, Yang, Dau, Tro

Reference Colour: Red brown
Texture: Coarse
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Possible wind shakes (internal fractures in wood). Wood light red to red brown or purplish red brown. Presence of resin.

Diameter: 70÷120cm
Density @12% MC: 790kg/m³
Janka Hardness: 1380lbf
Crushing Strength @12%MC: 65MPa
Static Bending Strength @12%MC: 115MPa
Longitudinal Modulus of Elasticity E: 16.61GPa
Volumetric Shrinkage Coefficient: 0.54% per %
Total Tangential Shrinkage TS: 10%
Total Radial Shrinkage TS: 5.4%
T/R Anisotropy Ratio: 1.9-
Fibre Saturation Point: 34%
Thermal Conductivity: 0.26W/mk
Lower Heating Value: 19200KJ/Kg
Sapwood Thickness: 5÷7cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 3 – moderately durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
Resistance to Termites: Class S – susceptible
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible)
Durability Notes: This species is listed in the NF EN 350 standard. Several species are grouped under the name Keruing of the genus Dipterocarpus and the natural durability is variable from one species to another. It is thus recommended to limit use of this wood without preservation treatment for end uses under use class 2.

Log Buoyancy: Does not float
Log Conservation: Moderate (treatment recommended)
Drying Rate: Slow
Drying Risk of Distortion: High risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: High risk

Blunting Effect: High
Sawing Tooth: Stellite-tipped
Machining Tool: Tungsten carbide
Suitability for Peeling: Good
Suitability for Slicing: Not recommended or without interest
Sawing Machining Notes: Silica content is variable. Some species are very resinous and tend to clog tools.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Resin exudations: to be taken into account when gluing.
Additional Notes: Plywood for light woods. Resin and shakes may restrict end uses. In Asia, this species, is used for sleepers and poles with a treatment
End Uses: Heavy carpentry, Exterior joinery, Ship building (planking and deck), Interior joinery, Boxes and crates, House framing, Stairs (inside), Flooring, Veneer for back or face of plywood, Bridges (parts not in contact with water, Vehicle or container flooring or ground), Veneer for interior of plywood, Exterior panelling, Panelling

Source 1: Tropical Timber Atlas, Editions Quae, e-ISBN 978-2-7592-2770-9