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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

Cocaine Bush

erythroxylum australe, Erythroxylaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Lukienzo, Dabé, Nkanza, Bimini

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: 2
Number of individual trees analyzed: 2
Number of specimens: 2
Number of measurements: 12
Max PZC read (of all measurements): 8.9
Min PZC read (of all measurements): 6.8
Max PZC average on one log: 8.2
Min PZC average on one log: 7.5
PZC Average of all logs: 7.8

Species: erythroxylum australe
Family: Erythroxylaceae
Clade: Angiospermae
Description: Erythroxylum australe is a native Australian shrub or small tree, typically growing 2-5 meters tall. It features glossy green, alternate, simple leaves, small white flowers in axillary clusters, and produces small, red, ovoid drupes.
Other Local Names: Lukienzo, Dabé, Nkanza, Bimini

Reference Colour: Light brown
Texture: Fine
Grain: Interlocked grain
Interlocked Grain: Slight
Notes: Wood light brown to light red brown darkening with light. Small dark pith flecks. Alternate light and dark veins.

Diameter: 80÷100cm
Density @12% MC: 660kg/m³
Janka Hardness: 780lbf
Crushing Strength @12%MC: 53MPa
Static Bending Strength @12%MC: 91MPa
Longitudinal Modulus of Elasticity E: 14.01GPa
Volumetric Shrinkage Coefficient: 0.46% per %
Total Tangential Shrinkage TS: 8.8%
Total Radial Shrinkage TS: 3.8%
T/R Anisotropy Ratio: 2.3-
Fibre Saturation Point: 30%
Thermal Conductivity: 0.22W/mk
Lower Heating Value: 19420KJ/Kg
Sapwood Thickness: 3÷6cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 2 – durable
Resistance to Dry Wood Borers: Class D – durable (heartwood durable but sapwood not clearly demarcated)
Resistance to Termites: Class D – durable
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 4 – in ground or fresh water contact Notes. The possible presence of few demarcated sapwood may have an influence on the expected durability. According to LANDA
Durability Notes: The possible presence of few demarcated sapwood may have an influence on the expected durability. According to LANDA Cross sections of Erythroxylum mannii 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: Good
Drying Rate: Normal to slow
Drying Risk of Distortion: Slight risk
Drying Risk of Case Hardening: No known specific risk
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
End Uses: Ship building (planking and deck), House framing, Stairs (inside), Flooring, Veneer for back or face of plywood, Sliced veneer, Vehicle or container flooring, Decking, Veneer for interior of plywood, Bridges (parts not in contact with water, Panelling or ground), Exterior joinery, Exterior panelling, Interior joinery, Seats, 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 Vernon Bunn) – PZC = 7.8
Log 2 (E. Mannii from Joey Montagut) – PZC = 8.0

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