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: 1
Number of individual trees analyzed: 1
Number of specimens: 2
Number of measurements: 6
Max PZC read (of all measurements): 21.6
Min PZC read (of all measurements): 19.2
Max PZC average on one log: 20.3
Min PZC average on one log: 20.3
PZC Average of all logs: 20.3

Species: hopea spp.
Family: Dipterocarpaceae
Clade: Angiospermae
Description: Hopea spp. are medium to large tropical rainforest trees native to Southeast Asia, characterized by simple, alternate leaves and distinctive winged fruits. They are highly valued for their durable hardwood timber.
Other Local Names: Koki, Cengal, Sengal, Gagil, Selangan, Selangan-Kasha, Sengal, Thingan, Light hopea, Manggachapoi, Manggachapui, Takhina, Takien, Sao

Reference Colour: Yellow brown
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Some logs are not floatable. Yellow brown to chocolate reddish brown with an occasional dark striping. Texture is fine to medium.

Diameter: 60÷120cm
Density @12% MC: 700kg/m³
Janka Hardness: 1200lbf
Crushing Strength @12%MC: 59MPa
Static Bending Strength @12%MC: 102MPa
Longitudinal Modulus of Elasticity E: 15.6GPa
Volumetric Shrinkage Coefficient: 0.47% per %
Total Tangential Shrinkage TS: 6.6%
Total Radial Shrinkage TS: 3.2%
T/R Anisotropy Ratio: 2.1-
Fibre Saturation Point: 20%
Thermal Conductivity: 0.23W/mk
Sapwood Thickness: 5÷7cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 2-3 – durable to moderately durable
Resistance to Dry Wood Borers: Class D – durable (heartwood durable but sapwood not clearly demarcated)
Resistance to Termites: Class S – susceptible
Treatability: Class 4 – non-treatable
Use Class Covered by Natural Durability: Class 3 – not in ground contact, outside
Durability Notes: Hopea p.p. with a density > 0.85 (Giam) have a better resistance to decay. According to the European standard NF EN 335 of May 2013, performance length might be modified by conditions in which it is used.

Log Buoyancy: Floats
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: Normal
Machining Tool: Tungsten carbide
Suitability for Peeling: Good
Suitability for Slicing: Not recommended or without interest
Assembly Nailing Screwing: Poor
Assembly Notes: Tends to split when nailing or screwing; nails hold poorly.
Additional Notes: Wood is resistant to acids
End Uses: Turned goods, Interior joinery, Framing, Built-in furniture or mobile item, Stairs (inside), House framing, Veneer for back or face of plywood, Fibre or particle boards, Vehicle or container flooring, Flooring, Veneer for interior of plywood, Cooperage, Exterior joinery, Sleepers

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