Agarwood, also known as oud, is a rare and valuable resinous wood that originates from the tropical regions of Southeast Asia. It is not easily cultivated and its formation is a natural process that takes years, sometimes decades, to develop. In mainland China, agarwood is quite scarce, with only small quantities found in Hui'an areas. However, it can still be found in countries like Vietnam, Thailand, India, Malaysia, and Cambodia. Due to its rarity and difficulty in forming, agarwood has long been considered a precious commodity.
Historically, the ancient Chinese records mention various types of agarwood, though many names have faded over time. Today, the most highly regarded agarwood comes from Vietnam, particularly the "Qi Nan" variety, but it remains extremely limited in supply.
There are several types of agarwood, each named based on its origin and characteristics. These include Guangxiang, Hainan Stack, Fanxiang, Qishen, Huangshu Shen, Sustained Fragrance, White Eye Fragrance, Shuixiangxiang, Leaf Fragrance, and more. The classification varies depending on where the agarwood is produced and how it is formed.
In terms of quality, agarwood is typically divided into three categories: water-sinking (also known as "water sinking"), semi-floating, and yellow ripe. Water-sinking agarwood is dense and heavy, often containing the most concentrated resin. It sinks in water, making it highly valued. Semi-floating agarwood is lighter and less dense, while yellow ripe agarwood refers to the softer, more fragrant pieces that float partially in water.
From a formation perspective, agarwood can be categorized into four types: ripe knot, raw knot, shedding, and insect leakage. Ripe knot occurs when the tree naturally decays and the resin forms over time. Raw knot happens when the tree is cut down, and the resin begins to form at the wound site. Shedding refers to the resin that forms as the wood itself decays, and insect leakage occurs when insects bore into the tree, causing the resin to seep out and harden.
Understanding these different types helps in identifying the quality and value of agarwood, which continues to be sought after for its unique fragrance and cultural significance.
Grinding Heads
Grinding head is a kind of small handle grinding tools, used in electric mills, hanging mills, hand electric drills. There are many kinds of diamond grinding head, ceramic grinding head, rubber grinding head, diamond grinding head, emery cloth grinding head.
Ceramic grinding head: grain size sand (generally brown corundum, white corundum, chrome corundum, silicon carbide) sintered by ceramic binder, with a metal handle in the center. Mainly grinding all kinds of metal, for grinding the inner wall of aperture, mold correction. Rubber grinding head: fine sand is synthesized by rubber binder for the polishing of mould
Diamond grinding head: A kind of stone material, ceramic materials and other non-metallic materials of grinding tools, especially involving a with diamond alloy grinding tools for grinding body, it includes substrate and a mill body, in which several mill body clearance to fixed to the substrate, the grinding surface of the grinding head grinding body also set a clearance, among them, the substrate is best by a certain toughness of adhesive materials, The grinding body is preferably made of diamond alloy material. The utility model has the advantages of high grinding performance, simple manufacturing and low cost, high grinding quality and being suitable for large-scale grinding
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