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: 29
Number of measurements: 93
Max PZC read (of all measurements): 16.0
Min PZC read (of all measurements): 7.5
Max PZC average on one log: 14.2
Min PZC average on one log: 8.1
PZC Average of all logs: 10.3

Species: dipteryx spp.
Family: Fabaceae
Clade: Angiospermae
Description: Large tropical trees with alternate, pinnately compound leaves, producing showy, pea-like flowers and large, woody, indehiscent pods containing a single, aromatic seed.
Other Local Names: Almendrillo, Champanha, Cumaru ferro, Cumarurana, Sarrapia, Almendro, Kumaru, Tonka bean, Gaïac de Cayenne, Tonka, Ebo, Charapilla, Shihuahuaco amarillo, Koemaroe, Tonka, Sarrapia

Reference Colour: Red brown
Texture: Medium
Grain: Interlocked grain
Interlocked Grain: Marked
Notes: Unpleasant wood odour when green. Heartwood varies from yellow brown to reddish brown with darker thin veins.

Diameter: 50÷90cm
Density @12% MC: 1070kg/m³
Janka Hardness: 3930lbf
Crushing Strength @12%MC: 103MPa
Static Bending Strength @12%MC: 170MPa
Longitudinal Modulus of Elasticity E: 26.61GPa
Volumetric Shrinkage Coefficient: 0.73% per %
Total Tangential Shrinkage TS: 7.7%
Total Radial Shrinkage TS: 5.5%
T/R Anisotropy Ratio: 1.4-
Fibre Saturation Point: 22%
Thermal Conductivity: 0.34W/mk
Lower Heating Value: 19760KJ/Kg
Sapwood Thickness: 2÷3cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1 – very durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood) CUMARU / TONKA* Cross sections of Dipteryx odorata
Resistance to Termites: Class D – durable
Treatability: Class 4 – non-treatable
Use Class Covered by Natural Durability: Class 4 – in ground or fresh water contact
Durability Notes: This species is listed in the NF EN 350 standard. 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: Does not float
Log Conservation: Good
Drying Rate: Slow
Drying Risk of Distortion: Slight risk
Drying Risk of Case Hardening: Yes
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: Sawing and machining are difficult due to hardness and interlocked grain.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Very high specific gravity: important that gluing be performed in compliance with the code of practice and instructions for the glue used.
Additional Notes: Slicing: only with the best shaped timber, to obtain very decorative veneers
End Uses: Turned goods, Bridges (parts in contact with water or, Heavy carpentry ground), Ship building (planking and deck), Bridges (parts not in contact with water, or ground), Tool handles (resilient woods), Poles, House framing, Cooperage, Industrial or heavy flooring, Hydraulic works (fresh water), Stakes, Hydraulic works (seawater), Sliced veneer, Sleepers, Decking

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