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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

Niove

staudtia spp., Myristicaceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Menga-menga, M’bonda, M’boun, Bokapi, Oropa, Molanga, Kamashi, Susumenga

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: 7
Number of individual trees analyzed: 7
Number of specimens: 14
Number of measurements: 48
Max PZC read (of all measurements): 20.5
Min PZC read (of all measurements): 8.6
Max PZC average on one log: 19.7
Min PZC average on one log: 9.3
PZC Average of all logs: 13.1

Species: staudtia spp.
Family: Myristicaceae
Clade: Angiospermae
Description: Staudtia spp. are tropical trees or shrubs, often called “false nutmeg” or “African nutmeg.” They feature simple, leathery leaves and produce fleshy, often dehiscent fruits containing a seed partially covered by a colorful aril.
Other Local Names: Menga-menga, M’bonda, Menga-menga, M’boun, Bokapi, Oropa, Molanga, Kamashi, Susumenga

Reference Colour: Red brown
Texture: Fine
Grain: Straight
Interlocked Grain: Absent
Notes: Heartwood orangey yellow brown to red brown with darker veins. Sometimes oily surface. Sometimes wavy grain.

Diameter: 50÷90cm
Density @12% MC: 880kg/m³
Janka Hardness: 2250lbf
Crushing Strength @12%MC: 88MPa
Static Bending Strength @12%MC: 151MPa
Longitudinal Modulus of Elasticity E: 18.51GPa
Volumetric Shrinkage Coefficient: 0.56% per %
Total Tangential Shrinkage TS: 6%
Total Radial Shrinkage TS: 4.6%
T/R Anisotropy Ratio: 1.3-
Fibre Saturation Point: 24%
Thermal Conductivity: 0.29W/mk
Lower Heating Value: 19710KJ/Kg
Sapwood Thickness: 8÷10cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1 – very 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 Atlas of Tropical Timber Species NIOVÉ
Durability Notes: This species is listed in the NF EN 350 standard. Presence of transition wood with a lower durability. 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: High risk

Blunting Effect: Fairly high
Machining Tool: Tungsten carbide
Suitability for Peeling: Not recommended or without interest
Suitability for Slicing: Good
Sawing Machining Notes: Sawing and machining difficulties.
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Tends to split with nailing. High specific gravity: important that gluing be performed in compliance with the code of practice and instructions for the glue used.
Additional Notes: Wood colour is often uneven. Resistant to one or several acids
End Uses: Turned goods, Industrial or heavy flooring, Heavy carpentry, Sliced veneer, Ship building (planking and deck), Decking, Shipbuilding (ribs), Bridges (parts in contact with water or, Cabinetry (high-end furniture) ground), Stairs (inside), Bridges (parts not in contact with water, or ground), Vehicle or container flooring, Exterior panelling, Panelling, Seats, Exterior joinery, Hydraulic works (fresh water), Interior joinery, Sleepers, Built-in furniture or mobile item, Flooring

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 28]) – PZC = 19.6
Log 2 (from [Source 27]) – PZC = 9.7
Log 3 (from [Source 13]) – PZC = 10.7
Log 4 (from [Source 9]) – PZC = 12.4
Log 5 (from [Source 42]) – PZC = 16.2
Log 6 (from NEHOSOC) – PZC = 9.7
Log 7 (s. stipitata from Joey Montagut) – PZC = 12.2

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