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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

Afrormosia

pericopsis elata, Fabaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Obang, Assaméla, Oleo pardo, Kokrudua, Bohala, Bohélé, Moholé, Ole, Olé

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: 8
Number of individual trees analyzed: 8
Number of specimens: 26
Number of measurements: 81
Max PZC read (of all measurements): 19.7
Min PZC read (of all measurements): 11.2
Max PZC average on one log: 16.5
Min PZC average on one log: 11.9
PZC Average of all logs: 14.2

Species: pericopsis elata
Family: Fabaceae
Clade: Angiospermae
Description: Pericopsis elata is a large, deciduous tree native to West Africa, highly valued for its durable, golden-brown timber known as Afrormosia or African Teak. It features pinnately compound leaves and produces flat, winged pods.
Other Local Names: Obang, Obang, Assaméla, Assaméla, Oleo pardo, Kokrudua, Obang, Bohala, Bohélé, Moholé, Ole, Olé

Reference Colour: Yellow brown
Texture: Fine
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Logs irregularly shaped. Wood yellow brown with darker veins, turning dark brown on exposure.

Diameter: 80÷120cm
Density @12% MC: 740kg/m³
Janka Hardness: 2100lbf
Crushing Strength @12%MC: 64MPa
Static Bending Strength @12%MC: 93MPa
Longitudinal Modulus of Elasticity E: 13.14GPa
Volumetric Shrinkage Coefficient: 0.5% per %
Total Tangential Shrinkage TS: 5.9%
Total Radial Shrinkage TS: 3.2%
T/R Anisotropy Ratio: 1.8-
Fibre Saturation Point: 20%
Thermal Conductivity: 0.24W/mk
Sapwood Thickness: 1÷2cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1-2 – very durable to durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
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 AFRORMOSIA
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: No known specific risk
Drying Risk of Checking: Slight 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: Risks of burning in machining. Slight tendency to tearing in planing (interlocked grain). Sawdust reported to be irritant.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Can stain when gluing.
Additional Notes: Excellent substitute for teck
End Uses: Turned goods, Interior joinery, Ship building (planking and deck), Built-in furniture or mobile item, Cabinetry (high-end furniture), Flooring, Stairs (inside), Sliced veneer, Panelling, Decking, Exterior joinery, Exterior panelling

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

Pictures – each from a different individual tree:

Log 1 (from Seralvo) – PZC = 13.5
Log 2 (from [Source 9]) – PZC = 17.0
Log 3 (from [Source 10]) – PZC = 11.6
Log 4 (from [Source 37]) – PZC = 12.1
Log 5 (from [Source 11]) – PZC = 13.3
Log 6 (from Re Parquet) – PZC = 14.1
Log 7 (from [Source 27]) – PZC = 12.9
Log 8 (from FPL Parquet) – PZC = 18.4

See also
EPOXY RESIN

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