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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

Newtonia

newtonia hildebrantii, Fabaceae, Angiospermae (Hardwood)

reference picture

Other names: Nom atui, Atui, Eseng

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: 1
Number of measurements: 6
Max PZC read (of all measurements): 12.5
Min PZC read (of all measurements): 10.6
Max PZC average on one log: 11.1
Min PZC average on one log: 11.1
PZC Average of all logs: 11.1

Species: newtonia hildebrantii
Family: Fabaceae
Clade: Angiospermae
Description: Newtonia hildebrandtii is a medium to large tree (Fabaceae) native to East Africa, characterized by its distinctive bipinnate leaves. It bears small, creamy-white flowers in spikes, which develop into flat, winged pods.
Other Local Names: Nom atui, Atui, Eseng

Reference Colour: Red brown
Texture: Coarse
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Sapwood yellowish to light brown. Heartwood silvery pink to reddish brown, often with wider, dark veins.

Diameter: 60÷80cm
Density @12% MC: 710kg/m³
Janka Hardness: 1290lbf
Crushing Strength @12%MC: 63MPa
Static Bending Strength @12%MC: 111MPa
Longitudinal Modulus of Elasticity E: 14.74GPa
Volumetric Shrinkage Coefficient: 0.37% per %
Total Tangential Shrinkage TS: 7.2%
Total Radial Shrinkage TS: 3.9%
T/R Anisotropy Ratio: 1.8-
Fibre Saturation Point: 36%
Thermal Conductivity: 0.24W/mk
Lower Heating Value: 19830KJ/Kg
Sapwood Thickness: 5÷10cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 4 – poorly durable
Resistance to Dry Wood Borers: Class S – susceptible (risk in all the wood)
Resistance to Termites: Class S – susceptible
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible) OSSIMIALE

Log Buoyancy: Floats
Log Conservation: Low (treatment necessary)
Drying Rate: Normal
Drying Risk of Distortion: No risk or very slight risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: Slight risk

Blunting Effect: Normal
Machining Tool: Ordinary
Suitability for Peeling: Good
Suitability for Slicing: Not recommended or without interest
Sawing Machining Notes: Very fine surface obtained after sanding.
Assembly Nailing Screwing: Good but pre-boring necessary
Additional Notes: Ossimale is similar to Ozigo but has a lower silica content
End Uses: Turned goods, Tool handles (resilient woods), Framing, Interior joinery, Formwork, Built-in furniture or mobile item, Boxes and crates, House framing, Open boats, Blockboard, Stairs (inside), Flooring, Veneer for back or face of plywood, Pulp, Vehicle or container flooring, Sculpture, Veneer for interior of plywood, Cooperage

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

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