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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

Agba

gossweilerodendron balsamiferum, Fabaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Tola branca, Sinedon, N’tola, Tola blanc, Émolo

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: 4
Number of individual trees analyzed: 4
Number of specimens: 8
Number of measurements: 27
Max PZC read (of all measurements): 19.4
Min PZC read (of all measurements): 9.3
Max PZC average on one log: 18.5
Min PZC average on one log: 10.6
PZC Average of all logs: 13.4

Species: gossweilerodendron balsamiferum
Family: Fabaceae
Clade: Angiospermae
Description: A large tropical South American forest tree, commonly known as Tola balsam, prized for its aromatic oleoresin. It features pinnate leaves and produces pods.
Other Local Names: Agba, Tola branca, Tola branca, Sinedon, N’tola, Tola blanc, Agba, Émolo, Agba, N’tola, Agba

Reference Colour: Light brown
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Possibility of ring shakes or wind shakes in logs. Wood yellow brown to light brown. Resin exudations. Light peppery scent.

Diameter: 70÷110cm
Density @12% MC: 520kg/m³
Janka Hardness: 690lbf
Crushing Strength @12%MC: 40MPa
Static Bending Strength @12%MC: 74MPa
Longitudinal Modulus of Elasticity E: 10.92GPa
Volumetric Shrinkage Coefficient: 0.33% per %
Total Tangential Shrinkage TS: 5.4%
Total Radial Shrinkage TS: 2.4%
T/R Anisotropy Ratio: 2.3-
Fibre Saturation Point: 27%
Thermal Conductivity: 0.18W/mk
Lower Heating Value: 19260KJ/Kg
Sapwood Thickness: 5÷10cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 2-3 – durable to moderately 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 Atlas of Tropical Timber Species
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible)
Durability Notes: This species is listed in the NF EN 350 standard.

Log Buoyancy: Floats
Log Conservation: Moderate (treatment recommended)
Drying Rate: Rapid to normal
Drying Risk of Distortion: No risk or very slight risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: No risk or very slight risk

Blunting Effect: Normal
Machining Tool: Ordinary
Suitability for Peeling: Good
Suitability for Slicing: Good
Sawing Machining Notes: Resin tends to clog tools. Sawdust sometimes irritant.
Assembly Nailing Screwing: Good
Assembly Notes: Wood fairly acidic: tendency to stain with gluing.
End Uses: Shingles, Exterior joinery, Framing, Interior joinery, Formwork, Built-in furniture or mobile item, Ship building (planking and deck), Moulding, Boxes and crates, House framing, Veneer for back or face of plywood, Blockboard, Veneer for interior of plywood, Sliced veneer, Panelling, Exterior panelling, Glued Laminated, Rolling shutters

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

Pictures – each from a different individual tree:

Log 1 (from [Source 27]) – PZC = 16.0
Log 2 (from Evolution Panels and Doors) – PZC = 10.9
Log 3 (from [Source 42]) – PZC = 9.6
Log 4 (from NEHOSOC) – PZC = 18.1

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