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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

Bloodwood

brosimum rubescens / b. paraense, Moraceae, Angiospermae (Hardwood)

reference picture – see below for more pictures

Other names: Amapa, Amapa doce, Arbol vaca, Leiteira, Guaimaro, Lechero, Sande, Palo de vaca, Dokali, Takina, Sandy, Panguana, Cow tree, Marina, Vaca

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: 5
Number of individual trees analyzed: 5
Number of specimens: 13
Number of measurements: 39
Max PZC read (of all measurements): 25.1
Min PZC read (of all measurements): 11.3
Max PZC average on one log: 23.5
Min PZC average on one log: 11.6
PZC Average of all logs: 18.9

Species: brosimum rubescens / b. paraense
Family: Moraceae
Clade: Angiospermae
Description: A tropical hardwood tree native to the Amazon, highly valued for its dense, durable, and vibrantly colored wood, which ranges from bright red to reddish-brown, often with a golden luster. Commonly known as Muirapiranga, Satine, or Bloodwood.
Other Local Names: Amapa, Amapa doce, Arbol vaca, Leiteira, Arbol vaca, Guaimaro, Lechero, Sande, Palo de vaca, Sande, Dokali, Takina, Palo de vaca, Sandy, Panguana, Cow tree, Marina, Sande, Vaca

Reference Colour: Light brown
Texture: Medium
Grain: Interlocked grain
Interlocked Grain: Slight
Notes: Heartwood varies from greyish white to light brown with golden shades. Sometimes, presence of internal stresses.

Diameter: 70÷90cm
Density @12% MC: 690kg/m³
Janka Hardness: 1050lbf
Crushing Strength @12%MC: 64MPa
Static Bending Strength @12%MC: 95MPa
Longitudinal Modulus of Elasticity E: 16.38GPa
Volumetric Shrinkage Coefficient: 0.59% per %
Total Tangential Shrinkage TS: 8.2%
Total Radial Shrinkage TS: 5.8%
T/R Anisotropy Ratio: 1.4-
Fibre Saturation Point: 28%
Thermal Conductivity: 0.23W/mk
Lower Heating Value: 18770KJ/Kg
Sapwood Demarcation: Not demarcated

Resistance to Decay: Class 5 – non-durable
Resistance to Dry Wood Borers: Class S – susceptible (risk in all the wood)
Resistance to Termites: Class S – susceptible
Treatability: Class 1 – treatable Atlas of Tropical Timber Species
Use Class Covered by Natural Durability: Class 1 – inside (no risk of dampness)
Durability Notes: Prone to blue stain.

Log Buoyancy: Floats
Log Conservation: Low (treatment necessary)
Drying Rate: Normal
Drying Risk of Distortion: 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: Some difficulties with sawing and machining due to internal stresses (overheating of sawblades) and highly interlocked grain. Keep sharp tools.
Assembly Nailing Screwing: Good
End Uses: Framing, Built-in furniture or mobile item, Boxes and crates, Moulding, Veneer for back or face of plywood, Fibre or particle boards, Veneer for interior of plywood, Flooring, Panelling, Sliced veneer, Interior joinery

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 = 23.1
Log 2 (from [Source 53]) – PZC = 23.0
Log 3 (from Joey Montagut) – PZC = 24.3
Log 4 (from [Source 28]) – PZC = 11.6
Log 5 (from Seralvo) – PZC = 13.0

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