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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

Lagerstroemia

lagerstroemia spp., Lythraceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Sralao, Bangor, Benteak, Jarul, Nandi, Ventaku, Ventak, Venteak, Venthek, Mai puay, Bungor, Kabek, Pyinma, Banaba, Intanin, Salao, Tabek, Bang lang

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: 5
Number of measurements: 15
Max PZC read (of all measurements): 12.9
Min PZC read (of all measurements): 9.0
Max PZC average on one log: 11.4
Min PZC average on one log: 10.9
PZC Average of all logs: 11.1

Species: lagerstroemia spp.
Family: Lythraceae
Clade: Angiospermae
Description: Deciduous shrub or small tree featuring showy, crinkled summer flowers (pink, purple, white, red), attractive exfoliating bark, and often vibrant fall foliage.
Other Local Names: Sralao, Bangor, Benteak, Jarul, Nandi, Ventaku, Ventak, Venteak, Venthek, Mai puay, Bungor, Kabek, Jarul, Pyinma, Banaba, Intanin, Salao, Tabek, Bang lang

Reference Colour: Light brown
Texture: Medium
Grain: Straight
Interlocked Grain: Absent
Notes: Important risks of logs splitting. Sometimes wood presents pink or grey shades. Sometimes wavy grain.

Diameter: 60÷100cm
Density @12% MC: 700kg/m³
Janka Hardness: 1410lbf
Crushing Strength @12%MC: 63MPa
Static Bending Strength @12%MC: 116MPa
Longitudinal Modulus of Elasticity E: 15.69GPa
Volumetric Shrinkage Coefficient: 0.46% per %
Total Tangential Shrinkage TS: 6.8%
Total Radial Shrinkage TS: 4.2%
T/R Anisotropy Ratio: 1.6-
Fibre Saturation Point: 26%
Thermal Conductivity: 0.23W/mk
Sapwood Thickness: 6÷10cm
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 D – durable
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible) BUNGUR

Log Buoyancy: Does not float
Log Conservation: Moderate (treatment recommended)
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: Not recommended or without interest
Suitability for Slicing: Good
Sawing Machining Notes: The wavy grain may be problematic for planing and result in fuzzy surfaces.
Assembly Nailing Screwing: Good
End Uses: Shingles, Interior joinery, Framing, Built-in furniture or mobile item, Ship building (planking and deck), Flooring, Cabinetry (high-end furniture), Sliced veneer, Stairs (inside), Sculpture, Vehicle or container flooring, Cooperage, 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 Animaverde) – PZC = 12.4
Log 2 (L. Speciosa from [Source 28]) – PZC = 12.3

See also
FROM FIREWOOD TO PZC RESULTS
LARGE GIFS 10

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