ZEBRAWOOD Family: Scientific name(s): Commercial restriction:
FABACEAE-CAESALPINIOIDEAE (angiosperm) Microberlinia brazzavillensis Microberlinia bisulcata no commercial restriction
WOOD DESCRIPTION
LOG DESCRIPTION
Color: light brown Sapwood: clearly demarcated Texture: coarse Grain: interlocked Interlocked Grain: slight Note: Wood yellow to light brown, with dark brown veins. Sometimes highly interlocked grain.
Diameter: Thickness of Sapwood: Floats: Log Durability:
PHYSICAL PROPERTIES
MECHANICAL/ACOUSTIC
24 – 39 inches 2 – 4 inches no moderate (treatment recommended)
Physical and mechanical properties are based on mature heartwood specimens. These properties can vary greatly depending on origin and growth conditions. Mean Std. Dev. Mean Std. Dev. Specific Gravity*: Crushing Strength*: 0.79 0.03 8,992 psi 1,595 psi Janka Hardness (lbs): Static Bending Strength*: 1,830 15,954 psi 5,366 psi Volumetric Shrinkage: Modulus of Elasticity*: 0.56% 2,541,061 psi Total Tangential Shrinkage (TS): 11.0% Total Radial Shrinkage (RS): Musical Quality Factor: 82.6 measured at 2623 Hz 8.8% TS/RS Ratio: 1.3 Fiber Saturation Point: 30% *At 12% moisture content. Stability: moderately stable
NATURAL DURABILITY AND TREATABILITY Fungi and termite resistance refers to end-uses under temperate climate. Except for special comments on sapwood, natural durability is based on mature heartwood. Sapwood must always be considered as non-durable against wood degrading agents. E.N. = Euro Norm Funghi (According to E.N. standards): class 3 – moderately durable Dry Wood Borers: class D - durable (sapwood demarcated, risk limited to sapwood) Termites (According to E.N. standards): class M – moderately durable Treatability (according to E.N. standards): class 4 – poorly permeable Use class ensured by natural durability: class 2 – inside or under cover Species covering the use class 5: no Note: This species is listed in the European standard NF EN 350-2. The possible presence of few demarcated sapwood may have an influence on the expected durability. According to the European standard NF EN 335, performance length might be modified by the intensity of end-use exposition.
REQUIREMENT OF A PRESERVATIVE TREATMENT Against dry wood borer attacks: In case of risk of temporary humidification: In case of risk of permanent humidification:
Overseas Hardwoods Company
does not require any preservative treatment requires appropriate preservative treatment use not recommended
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ZEBRAWOOD DRYING Drying Rate: Risk of Distortion: Risk of Casehardening: Risk of Checking: Risk of Collapse: Possible Drying Schedule:
slow slight risk no high risk no 4
M.C. (%) Green 30 25 20 15
Temperature (ยบF) Dry-Bulb Wet-Bulb
107.6 107.6 118.4 118.4
105.8 102.2 109.4 109.4
Air Humidity (%)
94 82 74 74
This schedule is given for information only and is applicable to thickness lower or equal to 1.5 in. It must be used in compliance with the code of practice. For thickness from 1.5 to 3 in, the air relative humidity should be increased by 5% at each step. For thickness over 3 in, a 10% increase should be considered.
SAWING AND MACHINING
ASSEMBLING
Blunting Effect: normal Sawteeth Recommended: ordinary or alloy steel Cutting Tools: tungsten carbide Peeling: not recommended or without interest Slicing: good Note: Risk of tearing in presence of highly interlocked grain
Nailing / screwing: good but pre-boring necessary Gluing: correct
END-USES
MAIN LOCAL NAMES
Cabinetwork (high class furniture) Sliced Veneer Furniture or Furniture Components Flooring Interior Joinery Wood Frame House Wood Ware Turned Goods
Overseas Hardwoods Company
Country
Local Name
Cameroon Gabon UK Germany
Allen Ele Zingana Zebrano, Zebrawood Zebrano
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