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PZC Chatometry

A standard system to measure wood chatoyance

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    • Woodworker’s Guide to Chatoyance
    • Woodworker’s Guide to Chatoyance – Compact Edition

Cerejeira

amburana caearensis, Fabaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Palo trébol, Roble, Roble criollo, Roble del país, Trébol, Roble americano, Soryoko, Amburana, Cumaru de cheiro, Imburana, Ishpingo, Sirioco

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: 6
Number of individual trees analyzed: 7
Number of specimens: 20
Number of measurements: 60
Max PZC read (of all measurements): 18.3
Min PZC read (of all measurements): 10.5
Max PZC average on one log: 16.3
Min PZC average on one log: 11.7
PZC Average of all logs: 14.1

Species: amburana caearensis
Family: Fabaceae
Clade: Angiospermae
Description: Amburana cearensis is a medium to large tree (Fabaceae) native to dry Brazilian regions, known for its fragrant, durable wood, pinnate leaves, and flat, winged pods containing aromatic seeds.
Other Local Names: Palo trébol, Roble, Roble criollo, Roble del país, Trébol, Roble americano, Soryoko, Amburana, Cumaru de cheiro, Imburana, Trébol, Ishpingo, Sirioco

Reference Colour: Yellow brown
Texture: Coarse
Grain: Straight or interlocked
Interlocked Grain: Slight

Diameter: 50÷90cm
Density @12% MC: 590kg/m³
Janka Hardness: 810lbf
Crushing Strength @12%MC: 45MPa
Static Bending Strength @12%MC: 73MPa
Longitudinal Modulus of Elasticity E: 10.98GPa
Volumetric Shrinkage Coefficient: 0.41% per %
Total Tangential Shrinkage TS: 4.5%
Total Radial Shrinkage TS: 2.4%
T/R Anisotropy Ratio: 1.9-
Fibre Saturation Point: 19%
Thermal Conductivity: 0.2W/mk
Sapwood Thickness: 5÷8cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 3 – moderately durable
Resistance to Dry Wood Borers: Class S – susceptible (risk in all the wood)
Resistance to Termites: Class M – moderately durable
Treatability: Class 2 – moderately treatable.
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible) Notes. This species is listed in the NF EN 350 standard. CEREJEIRA
Durability Notes: This species is listed in the NF EN 350 standard. CEREJEIRA Cross sections of Amburana cearensis

Log Buoyancy: Floats
Log Conservation: Moderate (treatment recommended)
Drying Rate: Slow
Drying Risk of Distortion: Slight risk
Drying Risk of Case Hardening: Yes
Drying Risk of Checking: Slight risk

Blunting Effect: Normal
Sawing Tooth: Ordinary or alloy steel
Machining Tool: Ordinary
Suitability for Peeling: Good
Suitability for Slicing: Good
Assembly Nailing Screwing: Good
Additional Notes: Filling is recommended
End Uses: Framing, Moulding, Cabinetry (high-end furniture), House framing, Veneer for back or face of plywood, Blockboard, Panelling, Sliced veneer, Exterior joinery, Sculpture, Interior joinery, Cooperage, Built-in furniture or mobile item

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

Pictures – each from a different individual tree:

Log 1 (from Contraveta) – PZC = 12.9
Log 2 (from [Source 28]) – PZC = 15.0
Log 3 (from [Source 27]) – PZC = 13.9
Log 4 (from Gonzalo DQA) – PZC = 15.6
Log 5 (from [Source 16)) – PZC = 12.4
Log 6 (from P. Hinds) – PZC = 16.3
Log 7 (from P. Hinds) – PZC = 13.0

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