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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

Curupixa

micropholis spp., Sapotaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Ibirá camby, Abiurana, Bacu mixa, Cubixa, Guajará, Grubixa, Grumixava, Pau de remo, Rosadinho, Rosadinha, Salgueiro, Kudi biushi, Moraballi, Baaka bouba, Bacouman, Balata blanc, Balata indien, Bouchi apa, Maaka, Mamantin, Barilla de agua, Reini lout, Riemhout, Suikerhout

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: 10
Number of measurements: 30
Max PZC read (of all measurements): 16.7
Min PZC read (of all measurements): 10.3
Max PZC average on one log: 16.1
Min PZC average on one log: 10.8
PZC Average of all logs: 13.2

Species: micropholis spp.
Family: Sapotaceae
Clade: Angiospermae
Description: Micropholis are Neotropical trees or shrubs in the Sapotaceae family, characterized by simple, leathery leaves and often edible, berry-like fruits.
Other Local Names: Ibirá camby, Abiurana, Bacu mixa, Cubixa, Guajará, Grubixa, Grumixava, Pau de remo, Rosadinho, Rosadinha, Salgueiro, Kudi biushi, Moraballi, Baaka bouba, Bacouman, Balata blanc, Balata indien, Bouchi apa, Maaka, Mamantin, Barilla de agua, Reini lout, Riemhout, Suikerhout

Reference Colour: Light brown
Texture: Fine
Grain: Straight
Interlocked Grain: Absent
Notes: Colour variable, yellow brown to grey brown, with sometimes pink or purplish glints.

Diameter: 50÷110cm
Density @12% MC: 750kg/m³
Janka Hardness: 1290lbf
Crushing Strength @12%MC: 59MPa
Static Bending Strength @12%MC: 109MPa
Longitudinal Modulus of Elasticity E: 17.3GPa
Volumetric Shrinkage Coefficient: 0.51% per %
Total Tangential Shrinkage TS: 7.9%
Total Radial Shrinkage TS: 4.8%
T/R Anisotropy Ratio: 1.6-
Fibre Saturation Point: 30%
Thermal Conductivity: 0.25W/mk
Lower Heating Value: 18610KJ/Kg
Sapwood Demarcation: Not demarcated

Resistance to Decay: Class 4 – poorly durable
Resistance to Dry Wood Borers: Class S – susceptible (risk in all the wood) CURUPIXA Cross sections of Micropholis venulosa
Resistance to Termites: Class M to class S – moderately durable to susceptible
Treatability: Class 2 – moderately treatable.
Use Class Covered by Natural Durability: Class 1 – inside (no risk of dampness)
Durability Notes: This species is listed in the NF EN 350 standard. Resistance to fungi variable according to the species and origins.

Log Buoyancy: Does not float
Log Conservation: Low (treatment necessary)
Drying Rate: Rapid to normal
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: Good
Suitability for Slicing: Good
Sawing Machining Notes: Variable silica content according to the species.
Assembly Nailing Screwing: Good
End Uses: Turned goods, Exterior joinery, Framing, Interior joinery, Cabinetry (high-end furniture), Built-in furniture or mobile item, Stairs (inside), Flooring, Veneer for back or face of plywood, Sliced veneer, Veneer for interior of plywood, Marquetry, 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 NEHOSOC) – PZC = 15.8
Log 2 (from P. Hinds) – PZC = 11.3
Log 3 (M. Scleroxylon from [Source 28]) – PZC = 14.4
Log 4 (M. Gardnerianum from [Source 27]) – PZC = 10.9

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