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: 3
Number of individual trees analyzed: 3
Number of specimens: 6
Number of measurements: 21
Max PZC read (of all measurements): 20.5
Min PZC read (of all measurements): 12.2
Max PZC average on one log: 18.2
Min PZC average on one log: 13.4
PZC Average of all logs: 15.7

Species: koompassia malaccensis
Family: Fabaceae
Clade: Angiospermae
Description: Koompassia malaccensis, or Tualang, is a massive emergent rainforest tree, often exceeding 80 meters with prominent buttress roots. It features pinnate leaves, small yellowish flowers, and distinctive flat, winged seed pods.
Other Local Names: Menggeris, Toemaling, Impas, Mengris, Yuan

Reference Colour: Red brown
Texture: Coarse
Grain: Straight or interlocked
Interlocked Grain: Marked
Notes: Pink when freshly sawn, weathering to orange-red or yellow-brown. Frequent concentric layers of phloem.

Diameter: 60÷210cm
Density @12% MC: 880kg/m³
Janka Hardness: 2070lbf
Crushing Strength @12%MC: 66MPa
Static Bending Strength @12%MC: 113MPa
Longitudinal Modulus of Elasticity E: 23GPa
Volumetric Shrinkage Coefficient: 0.54% per %
Total Tangential Shrinkage TS: 6.6%
Total Radial Shrinkage TS: 4.8%
T/R Anisotropy Ratio: 1.4-
Fibre Saturation Point: 27%
Thermal Conductivity: 0.29W/mk
Lower Heating Value: 18530KJ/Kg
Sapwood Thickness: 2÷5cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 2 – durable
Resistance to Dry Wood Borers: Class S – susceptible (risk in all the wood)
Resistance to Termites: Class S – susceptible
Treatability: treatability is considered low (class 3). However, according to certain bibliographical sources, this species is easily treatable. According to the European standard NF EN 335 of May 2013, performance length might be modified by conditions in which it is used.
Use Class Covered by Natural Durability: Class 3 – not in ground contact, outside Atlas of Tropical Timber Species KEMPAS
Durability Notes: This species is listed in the NF EN 350 standard. According to this standard, Kempas

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: Fairly high
Sawing Tooth: Stellite-tipped
Machining Tool: Tungsten carbide
Suitability for Peeling: Not recommended or without interest
Suitability for Slicing: Good
Sawing Machining Notes: Similar to drying, concentric layers of phloem may cause sawing damage.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: High specific gravity: important that gluing be performed in compliance with the code of practice and instructions for the glue used.
End Uses: Turned goods, Industrial or heavy flooring, Heavy carpentry, Sliced veneer, Vehicle or container flooring, Cooperage, Exterior joinery, Sleepers, Flooring

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