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Trees and distribution. The trees are short, the trunk height is often between 4.5-6n, and there are up to 15m. The main trunk is about 2.5m short, sometimes there are multiple trunks of a tree, and the diameter of the breast is usually about 2bm. See also 30cmo distributed in savanna areas such as Sudan, Mozambique, Tanzania, Zambia, Angola, Nigeria and Senegal. One year after arriving in Hong Kong, the specification was 1.4-2.3n long, and the diameter of 14-22cmo was grayish white, thin, shallow and longitudinal. , small strips fall off. The endothelium is taupe, layered. The bark is 3-4 nvn thick, hard, and the section is gray-brown with a wavy annular arrangement. The fiber type is stripped and stripped. The skin is smoother. The body is not round and has a long groove. The material table is yellowish white, the sun is grayed out for a long time, there are small ribs, common drum nails and horse eyes (clip skin), because the horse's eye seeps into the water, causing the edge rot depth of 2-6cm, such edge rot The standing timber has appeared during the growth process. The end face has a chainsaw chain knife scar.
Wood characteristics. The sharpness of the heartwood is obviously different. The sapwood is yellowish white, narrow, and the width of the head is inconsistent. The big head is narrow 5-1QxDn, and the small head is 12-17HM wide. The heartwood is black-purple or completely black, and is used for sawing and sawing circular saws. The smooth surface is oily black, and sometimes irregular light-straight stripes appear. The growth wheel is unclear, and the semi-annular hole material tends to be arranged. The common large hole 6-8 in the magnifying glass is arranged along the wheel boundary. The size of the tube holes is different. The magma of the large head tube hole is clear under the magnifying glass. The small tube hole is slightly visible to the naked eye, and the smaller tube hole is obvious under the magnifying glass. The tube hole is small to small, the number is small, and the distribution is uneven. Single tube holes, there are also two to three radial columns. The heartwood tube hole contains black gum, and the sapwood tube hole has sediment. The wood fiber is often sandwiched with silicon particles, which are reflected by a sunlight magnifying glass, and visible in the pores of the tube. Under the sunlight magnifying glass, the weak illuminator is covered with the surface of the board, and there is a fire of the stars. The axial thin-walled structure is rich, and the strips are linearly arranged under the magnifying glass. The wavy strips are easy to see, and the wavy strips are interwoven with the wooden rays into a network, and the ring-shaped tube. Heartwood can only be seen after it has faded with alcohol. The wood ray is fine, and the single row and multiple columns of the same are visible under the magnifying glass, and the width is less than about 10 times the diameter of the tube. Wood ray is almost the same color as thin-walled tissue, especially sapwood. The wave mark magnifying glass is faintly visible.
Wood properties. The texture is straight and the logs often have longitudinal cracks. The structure is fine and even and shiny. The hand touches the texture of the oil. The logs have a slightly sour aroma when they are close to the nose when they are wet. Due to the thick cell wall and the existence of different tubes, the material is very heavy and hard, and the air-dry density is 1.00-1.33g/cnf. The dry shrinkage rate of the full dry volume is 0.27-0.50%. Another piece of information, the wood is very hard and the dry weight is 1. X-1.33e/cnf, volume shrinkage rate 8.0-10.1%. Mechanics. Bending strength 1859-2 calendar 5k9/1cJ, bending elastic modulus 120622-205 is called 0k9/cJ, anti-pressure strength ship-747k9/cJ, horizontal grain compressive strength 35-3/QJ, anti-cracking force 26.9-27.5N/nvn, hardness 20.2-23.9N. Another data, static properties: MOR (destruction coefficient) static bending strength 1896. 2718kd / cm2, coffee E × 1d (static elastic coefficient) static bending elastic modulus 123 deleted - 21 (x) CDk full /c expensive, longitudinal compressive strength 702-762U / c expensive, lateral arch 3 tensile strength 36.5k full / c expensive, hardness (side) 20.2-23. State, cleft palate resistance 27.4-28.0k accounted for /c expensive, impact bending strength 0.39-0.7kdm person m2. Processing. It is difficult to cut logs. Generally, the band saw blade sawtooth is quickly worn out, and the aluminum alloy sawtooth is also dislocated due to the hard wood. Due to the small size of the logs, the small-diameter sawing saws are used for sawing and sawing. The surface of the sheet is smooth and smooth, but the thickness of the saw blade is 6nEn, which is twice as wide as the band saw, and the loss is much. The yield is low. The nail and the upper screw must be drilled first to prevent the nail from penetrating and splitting. The surface of the car is very smooth, the adhesive is good, and the paint performance is not ideal. The crafts and high-grade furniture produced are not painted, and the smoother the touch.
dry. Dry slowly. The quantity is small, very precious, and the manufacturers are mostly based on natural gas. Logs or sawed boards are usually placed in the warehouse in the shade. Some operators owe this to the performance of the wood, put it on the ground, and let the sun shine, causing the sudden breakage of the acquired man-made, extending to the surface of the material is difficult to see, but also a pity. In the local area, long logs and short logs are usually dry and cut off, and placed in the shed for final drying, so that less cracking occurs.
Durability. High oil content and strong resistance to invasiveness. The heartwood is very resistant to corrosion, abrasion, termites and insects. The sapwood is not resistant to corrosion. It is vulnerable to m bmsiabBdes (thorny embryo, long scorpion, small semi-social beetle), and the pinhole eye is obvious. Standing timber is also vulnerable to eucalyptus insects.
use. Used as ornaments, engravings, inlaid ornaments, high-grade furniture, woodcarving crafts, ivory and jade carvings, canes, and handles. Good acoustic performance, for high-end wind instruments, such as CIMlnM ( clarinet, commonly known as black tube, single-spindle wind instrument), oboe (only mouth double reed), flute, bagpipe and cymbal, erhu, violin fingerboard, etc. Is the most popular wood for woodwind instruments
African rare tree species--East African black rosewood
East African black rosewood Dalbergia (East African black and yellow) butterfly-shaped flower family rABJLcnLE, Dalbergia, black rosewood, one of China's redwood national standard tree species. Commercial name: African blackwood AhcMblackwood, African rosewood, also known as African rosewood ANC muscle Mwood. Place name: Mozambique said Mozambique, Ipod, Ixd) ique ebory (meaning Mozambique ebony), Grenada, Gren汕1h (English means small and small), Sudan called Babanus Ba-ba s, Tanzania For Mojim Bay Mu9ente. African black (African black wood is the abbreviated name of Huang).