Mansonia Technical Data

BETE Family: Scientific name(s): Commercial restriction: Note: also called Mansonia

Malvaceae (angiosperm) Mansonia altissimna no commercial restriction

WOOD DESCRIPTION

LOG DESCRIPTION

Color: brown Sapwood: clearly demarcated Texture: fine Grain: straight Interlocked Grain: absent Note: Logs are almost floatable. Wood yellowish brown to dark grey brown with purplish glints. Veins more or less visible.

Diameter: Thickness of Sapwood: Floats: Log Durability:

PHYSICAL PROPERTIES

MECHANICAL/ACOUSTIC

15 – 27 inches 1 – 2 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*: 0.66 0.03 8,702 psi 870 psi Janka Hardness (lbs): Static Bending Strength*: 1,290 15,954 psi 1,450 psi Volumetric Shrinkage: Modulus of Elasticity*: 0.44% 0.06% 1,975,414 psi 177,526 psi Total Tangential Shrinkage (TS): 7.4% 0.6% Total Radial Shrinkage (RS): Musical Quality Factor: 137.7 measured at 2772 Hz 4.6% 0.4% TS/RS Ratio: 1.6 Fiber Saturation Point: 28% *At 12% moisture content.

Stability: poorly 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 1 – very durable Dry Wood Borers: class D – durable (sapwood demarcated, risk limited to sapwood) Termites (According to E.N. standards): class D – durable Treatability (according to E.N. standards): class 4 – not permeable Use class ensured by natural durability: class 3 – not in ground contact, outside Species covering the use class 5: no Note: This species is listed in the European standard NF EN 350-2.

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 does not require any preservative treatment use not recommended

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BETE

DRYING Drying Rate: Risk of Distortion: Risk of Casehardening: Risk of Checking: Risk of Collapse: Possible Drying Schedule:

normal no risk or very slight risk no high risk no 2

M.C. (%) Green 104 86 68 59

Temperature (ยบF) Dry-Bulb Wet-Bulb 122 116.6 122 113 131 116.6 158 131 167 136.4

Air Humidity (%) 183.2 167 152.6 116.6 111.2

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: ordinary Peeling: good Slicing: good Note: Sawdust may cause dermatitis or mucosa irritation

Nailing / screwing: good Gluing: correct Note:

END-USES

MAIN LOCAL NAMES

Moulding Exterior paneling Cabinetwork (high class furniture) Flooring Glued laminated Exterior Joinery Light Carpentry Ship building (planking and deck) Industrial or heavy flooring Veneer for interior of plywood Interior Joinery Shingles Sliced veneer Stairs (inside) Turned goods Tool handles Resistant to one or several acids

Country Cameroon Ghana Central African Republic Congo

Overseas Hardwoods Company

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Local Name Koul Aprono Koul Guissepa

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