HIGHTOP WOOD (China Shanggao Wood) November 28, 2018 - Shanggao Wood Industry Knowledge: The world's lightest wood is the Kapok family and the heaviest wood is the snake wood Mulberry.
The world's smallest wood - balsa
Balsa, Bombacaceae, Ochroma, scientific name Ochroma pyramidale or Ochroma lagopus, other English names are balsa or balsa wood. It is distributed in the Indian archipelago, southern Mexico to Peru, Bolivia and other tropical low-altitude areas, as well as Taiwan, Guangdong, Hainan and Yunnan.
Balsa is the only evergreen medium-sized tree in the genus Kapokaceae. It is also one of the fastest growing tree species in the world, growing up to 5-6 meters a year and 5-13 cm in diameter. A 10-year-old balsa can be as high as 16 meters and 50-60 cm in diameter.
Due to the rapid renewal of cellular tissues in the body, all parts of the plant are extremely soft and elastic. Its trunk is straight and tall, and the bark is brown. The leaves are broadly heart shaped and alternately grow on the branches. The flower is large, yellowish white, and is born on the top of the canopy.
The knot has a long round capsule with a cotton tuft inside and consists of five fruit petals. The seeds are obovate, reddish or brown, and densely covered with fluff, like cotton seeds.
Balsa is the world's lowest density wood with a density of about 0.12 g/cm3. The wood has a straight texture, a fine and uniform structure, and is very soft and soft, so the strength and impact toughness are very low, and the processing is also easy. But if the planer is not sharp, the board is prone to hairiness.
Because of its low density, good dimensional stability, uniform material, low thermal conductivity and easy processing, balsa wood has superior advantages over other materials and is widely used as insulation material, sound insulation equipment, life-saving equipment and aircraft. Manufacturing and other fields.
In the 1960s, China began to introduce and test light wood. At present, Yunnan, Guangdong, Fujian, Hainan, Taiwan and other provinces have been planted in large areas.
The world's densest wood - serpent wood
As the world's densest wood, the heartwood of serpentine has irregular black spots and impermanent patterns, named after serpentine. From the perspective of wood density, wood color and structural density, it is superior to red rosewood and is one of the hardest and most precious precious woods. Snake wood is very expensive and is mainly used for high-end decoration, high-end crafts, and high-end furniture.
Snake wood is also known as snake mulberry, Morace, and Piratinera.
Scientific name Piratinea quianensis,
Trade name snake, Letterwood.
The place names are Cacique carey (Panama), Palo de oro (Venezuela), Burokoro, Tibicusi (Guyana), Letterhout (Suriname), Boisd amourette (French Guiana).
Small canopy arbor, no roots, 25m high, 15m trunk, 30-50 cm in diameter.
The heartwood and sapwood are distinctly different, the heartwood is dark reddish brown, the sapwood is wide, and it is yellowish white. The breast diameter is 50 cm, and the heartwood is 18 cm or less. The breast diameter is 38 cm, and the heartwood is only 2.5-10 cm. The unique dark pattern of the heartwood is made of resin and has a decorative effect. Strong, fine structure, straight texture.
The porous material has a small diameter, and the thin-walled structure is a tubular shape with fine wood rays. The wood is very heavy and has a high strength. When the air-dry density is 1.20-1.36g / cm 3 , it is the world's densest wood. The heartwood is extremely resistant to corrosion, insect-resistant, smooth cut surface and good polishing. The radial shrinkage is about 6%, the chord shrinkage is about 9%, and the end face is prone to cracks.
to sum up
Wood is a porous material composed of cell wall materials, moisture and voids. The density of wood refers to the mass of wood per unit volume in grams per cubic centimeter or kilograms per cubic meter.
Wood density is an important indicator of wood properties, directly affecting the physical, mechanical properties and processing properties of wood.
In general, the higher the density of wood, the higher the strength, the more difficult the processing, the worse the dimensional stability, and the more difficult it is to dry. The main factors affecting the density of wood are tree species, late wood rate, water content, and trunk parts. This article describes the two types of wood that are currently known to have the lowest density and highest density in the world.