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Evaluating Mukau Wood.Pdf Mukau wood, with “flames”. (Photo: Jan Vandenabeele) Mahogany from DR Congo. (Photo: KEFRI) Evaluating mukau wood Looking at the properties of Melia volkensii, compared to mahogany, teak and mvule BY NELLIE ODUOR elia volkensii is an indigenous last decade, owing to a shortage of alternative Texture and grain tree species in the plant hardwood species. The Kenya Forestry Research Texture describes the relative size of vessels in family Meliaceae. Its common Institute (KEFRI) has led the way in developing the wood. It affects the resistance of the timber names include mukau (Kamba propagation, establishment and management to abrasion, and to some extent, the quality of / Mbeere / Embu / Meru), techniques for Melia since the 1990s. the machined and polished surface finish. The mpendaM bure (Swahili), kirumbutu (Taita) and Through on-station and on-farm research, texture of Melia is coarse which means it has boba (Somali). Melia grows naturally in the semi- several techniques of establishing and managing large and widely spaced vessels, which are arid zones of Ethiopia, Somalia, Tanzania and the tree have been realised. As a result, tree visible to the naked eye. Melia’s texture is the Kenya. growers are now striving to grow Melia as a same as that of mahogany, teak and mvule. The species is common in deciduous plantation species. The grain is the alignment of cells relative to bushland in association with Acacia-Commiphora the axis of the tree or the longitudinal edge of vegetation in agro-ecological Zones IV - V (arid Comparison with other well known species an individual piece of sawn timber. The grain of and semi-arid). In Kenya, the species grows In Table 1, we compare Melia to mahogany Melia is straight; so is that of mahogany and teak mostly in Mbeere, Tharaka, Mutomo, Kitui, (Khaya species), teak (Tectona grandis) and timber. Mwingi, Makueni and Taita Taveta. In these areas, mvule (Milicia excelsa), all well-known species. the tree is managed as remnants of natural Mechanical properties stands, woodlots, scattered trees on cropland Density The mechanical properties of wood are an and homestead compounds. Density is defined as a tree’s mass per unit expression of its behaviour under applied forces. The tree grows to a height of 15 metres, has volume measured at particular moisture content. Melia timber has superior mechanical wood a rounded crown and low hanging branches. It Melia is a moderately heavy species with an properties and is comparable with mahogany, has grey and fairly smooth bark. The leaves are average density of 620 kg/m3. This compares teak and mvule (Table 2). compound with many leaflets. The flowers are well with the three species mentioned above and white in dense panicles. The fruits are green all are classified as moderately heavy (densities Bending strength (modulus of rapture - MOR) ovals, about 4cm long, which turn yellow when ranging between 580 and 810 kg/m3). This shows the highest stresses in the outermost ripe. fibres of the wood when the beam breaks under The timber is pale reddish-brown, resembling Heartwood and sapwood colour a load. The bending strength of Melia is relatively mahogany, and is highly valued for a variety The predominant colour of the heartwood and high, and thus it is classified as a strong timber. of uses. It is suitable for furniture/joinery and sapwood of Melia after drying is pale-red and The other three species are equally strong as interior panelling. pale brown respectively. The colour of Melia they range from moderately strong (mahogany) Melia has been exploited heavily over the timber is very close to that of mahogany. to very strong (teak and mvule). Table 1: Some physical properties of mukau (Melia volkensii), mahogany (Khaya spp), teak (Tectona grandis) and mvule (Milicia excelsa) Property Melia Mahogany Teak Mvule Average density (kg/m3)-[air dry] 620 (Moderately heavy) 685 (Moderately heavy) 650 (Moderately heavy) 675 (Moderately heavy) Pale brown sapwood to Pale brown sapwood to pinkish Light golden with dark Yellow-white sapwood to yellow to deep Heartwood and sapwood colour pale red heartwood brown to deep red heartwood markings golden-brown heartwood Coarse textured with Coarse textured with straight or Uneven coarse textured Coarse textured with interlocked and wavy Texture and grain straight grains interlocked grains with straight grains grains Table 2: Some mechanical properties of mukau (Melia volkensii), mahogany (Khaya spp), teak (Tectona grandis) and mvule (Milicia excelsa) Property Melia Mahogany Teak Mvule Bending strength (MOR) [N/mm2] 74 – 96 50 – 110 81 – 196 75 – 156 Bending stiffness (MOE) [KN/mm2] 5.8 – 9.2 7.8 – 10.3 7.6 – 17.5 8.3 – 13.0 Crushing strength [N/mm2] 42 – 56 24 – 53 34 - 70 42 – 65 Shear strength (parallel to grain) [N/mm2] 14 – 18 8 – 14 5 - 16 5 - 14 Hardness [N/mm2] 3.5 – 5.1 3.4 – 5.7 3.8 – 4.8 4.8 – 6.1 KN = Kilo Newton N = Newton: a unit to measure force applied per area. 10 Miti April - June 2013 Table 3: Some seasoning and wood working properties of mukau (Melia volkensii), mahogany (Khaya spp), teak (Tectona grandis) and mvule (Milicia excelsa) Mahogany from DR Congo. (Photo: KEFRI) Property Mukau Mahogany Teak Mvule Shrinkage rates Low Moderate Low Moderate Movement in service Small once the wood is dry Fairly stable once dry Stable with low movement values Small once the wood is dry Machining Easy to saw and work Easy to work Easy to saw and work Saws easily Seasoning/drying Seasons well with little degrade of Seasons well without degrade Seasons well Seasons well without degrade characteristics minor end checks Heartwood is durable and Durable - decay and termite Moderately durable but resistant to decay but not immune Durable and extremely termite resistant. Durability susceptible to termites and to termites. and decay resistant Moderately resistant to marine pinhole borers Sapwood is susceptible to attack borers and powder post beetles. by beetles-borers • Furniture /joinery • Furniture /joinery • Veneer /panelling • Ship and boat-building • Panelling • Ship and boat-building • Furniture /joinery • Veneer • Framing • Veneer /panelling • Floor parquets Uses • Furniture • Floor parquets • Floor parquets • Boat-building • Carvings • Poles • Framing • Framing • Exterior construction Bending stiffness (modulus of elasticity - MOE) Seasoning Natural durability This expresses the linear relationship between The seasoning (drying) rate with which a timber Natural durability refers explicitly to the stress and strain within the elastic range of a can be dried is determined by kiln settings or resistance of the timber to fungal degradation material, providing an indication of stiffness. ambient climatic conditions and board thickness. and insect attack. The principal factor conferring It is important in determining the reflection of The rate at which a particular timber species resistance to biological attack is the presence of a beam under load. The bending stiffness of dries is principally determined by its density, extractives in the heartwood. Generally, Melia Melia is generally low compared to the three anatomical characteristics and the degree to timber is classified as durable and extremely other species, meaning it is not suited to heavy which drying can be accomplished to 12 per termite and decay resistant (15-25 years) when engineering work. cent moisture content, with acceptable levels of in contact with the ground in the tropics. This degrade if present. Melia was found to dry well makes the species suitable for external use. Crushing strength without degrade. This is the maximum compressive strength of the Conclusions specimen, parallel to the grain and is important Wood-working properties KEFRI’s Timber Bulletin (No. 1) entitled “Strength for columns and chair legs. The crushing strength Machining is the ease or difficulty with which a Groups of Kenyan Grown Major Commercial for Melia is high, at the range of 42 – 56 N/mm2. timber can be machined. Melia is generally easy Timbers” has grouped 49 species into four strength to machine and work with. It gives good finishing groups – S1 to S4 in order of decreasing strength Shear strength (parallel to the grain) (the general quality of a finished surface) and properties (very strong, strong, moderate and This is the measure of the resistance of the timber takes polish well. The grain orientation gives weak). These four categories reflect the common to shearing/splitting/tearing. The shear strength for this species an eye-catching feature, which can uses of timber in Kenya, i.e., heavy engineering, Melia is high at a range of between 14 – 18 N/mm2. be exploited for woodcarvings and furniture- general structural construction (housing), furniture making. This property of Melia is also generally manufacturing and light construction. Hardness noted in the other species it is compared with. Based on the MOR and MOE values, Melia can This represents the resistance of the wood to wear Melia timber has low shrinkage rates and be grouped S3 to S2 (moderate to strong). This and abrasion, which is a useful property in assessing movement in service is small (Table 3). This means the timber from this species can be used the suitability of a timber for flooring. Melia has a aspect makes the species suitable for flooring in general construction and for furniture. It has range of 3.5 – 5.1 N/mm2 and is thus rated as a soft and furniture. The rates of shrinkage of also been noted that Melia has small movement to moderately hard timber. The moderate hardness mahogany, teak and mvule are moderate to low in service, making it very stable while in use. Its makes the species suitable, just like mahogany and and these species too, are fairly stable in service. low rates of shrinkage also make it suitable for mvule, for making floor parquets.
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