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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

Mandioqueira

qualea albiflora, Vochysiaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Arenillo, Mandioqueira aspera, Mandioqueira escamosa, Mandioqueira lisa, Gonfolo, Gonfolo kouali, Gronfolo, Berg gronfoeloe, Gronfoeloe, Florecillo

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: 2
Number of specimens: 4
Number of measurements: 12
Max PZC read (of all measurements): 21.0
Min PZC read (of all measurements): 17.6
Max PZC average on one log: 20.1
Min PZC average on one log: 18.7
PZC Average of all logs: 19.4

Species: qualea albiflora
Family: Vochysiaceae
Clade: Angiospermae
Description: Qualea albiflora is a medium to large evergreen tree native to the Amazon, characterized by its showy clusters of fragrant white flowers and leathery leaves.
Other Local Names: Arenillo, Mandioqueira aspera, Mandioqueira escamosa, Mandioqueira lisa, Gonfolo, Gonfolo kouali, Gronfolo, Berg gronfoeloe, Gronfoeloe, Florecillo

Reference Colour: Pinkish brown
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Wood pinkish brown to red brown, sometimes olive brown. Grain sometimes wavy. Unpleasant odour when green. Wood from species of Ruizterania are beige grey in colour, which differentiates them from genus Qualea woods, which are more pinkish or reddish.

Diameter: 50÷80cm
Density @12% MC: 740kg/m³
Janka Hardness: 1410lbf
Crushing Strength @12%MC: 69MPa
Static Bending Strength @12%MC: 103MPa
Longitudinal Modulus of Elasticity E: 19.4GPa
Volumetric Shrinkage Coefficient: 0.6% per %
Total Tangential Shrinkage TS: 9.7%
Total Radial Shrinkage TS: 5.8%
T/R Anisotropy Ratio: 1.7-
Fibre Saturation Point: 31%
Thermal Conductivity: 0.24W/mk
Lower Heating Value: 18190KJ/Kg
Sapwood Thickness: 3÷6cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 3 – moderately durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
Resistance to Termites: Class S – susceptible
Treatability: Class 2 – moderately treatable.
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: Does not float
Log Conservation: Moderate (treatment recommended)
Drying Rate: Normal
Drying Risk of Distortion: High risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: High risk

Blunting Effect: Normal
Machining Tool: Ordinary
Suitability for Peeling: Good
Suitability for Slicing: Good
Sawing Machining Notes: Some species can be siliceous and present an important blunting effect. In this case, it is necessary to use adequate tools.
Assembly Nailing Screwing: Good
End Uses: Heavy carpentry, Exterior joinery, Formwork, Interior joinery, Ship building (planking and deck), Built-in furniture or mobile item, Boxes and crates, Moulding, Open boats, House framing, Vehicle or container flooring, Flooring, Veneer for interior of plywood, Sliced veneer, Panelling, Exterior panelling, Glued Laminated, Seats, Tool handles (resilient woods)

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

Pictures – each from a different individual tree:

Log 1 (from Joey Montagut) – PZC = 18.6
Log 2 (q. mandioqueira from Joey Montagut) – PZC = 19.5

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