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: 5
Number of specimens: 8
Number of measurements: 30
Max PZC read (of all measurements): 17.0
Min PZC read (of all measurements): 12.5
Max PZC average on one log: 16.1
Min PZC average on one log: 13.4
PZC Average of all logs: 14.6

Species: dryobalanops spp.
Family: Dipterocarpaceae
Clade: Angiospermae
Description: Dryobalanops spp. are large, emergent rainforest trees native to Southeast Asia, highly valued for their durable Kapur timber. They feature simple, alternate leaves and distinctive two-winged fruits.
Other Local Names: Kapur empedu, Kapur kayatan, Kapur singkel, Kapur sintuk, Kapur tanduk, Petanang, Borneo camphorwood, Kapur kejatan, Keladan, Paigie, Swamp kapur

Reference Colour: Red brown
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Brittleheart. Wood colour varies from red brown to pink brown. Camphor smell. Presence of thin resin veins.

Diameter: 50÷100cm
Density @12% MC: 740kg/m³
Janka Hardness: 1230lbf
Crushing Strength @12%MC: 60MPa
Static Bending Strength @12%MC: 110MPa
Longitudinal Modulus of Elasticity E: 16.15GPa
Volumetric Shrinkage Coefficient: 0.52% per %
Total Tangential Shrinkage TS: 9.1%
Total Radial Shrinkage TS: 4.5%
T/R Anisotropy Ratio: 2-
Fibre Saturation Point: 26%
Thermal Conductivity: 0.24W/mk
Lower Heating Value: 18640KJ/Kg
Sapwood Thickness: 4÷8cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1-2 – very durable to durable KAPUR Cross sections of Dryobalanops oblongifolia
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
Resistance to Termites: Class M – moderately 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. After felling, logs are very sensitive to black holes. Medium resistance to decay in tropical climates. 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: 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: Good
Suitability for Slicing: Not recommended or without interest
Sawing Machining Notes: Normal to significant blunting effect.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Possible oxydation in contact with iron. Resin exudations should be taken into account when gluing.
Additional Notes: Stains runoff water
End Uses: Turned goods, Exterior joinery, Shingles, Interior joinery, Heavy carpentry, Built-in furniture or mobile item, Formwork, House framing, Boxes and crates, Flooring, Stairs (inside), Decking, 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, Tool handles (resilient woods)

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