栲胶是将含有单宁的树皮、果壳、根、叶等原料粉碎后,用热水浸泡,将浸泡液进行蒸发浓缩、干燥去水,而制成的棕色粉状或块状固体物质。栲胶原料资源丰富,品种很多,据了解,目前发现的就有40多种。含单宁量在20%以上的有橡碗、化香果、红根、余柑皮等,一般用3吨原料可生产1吨栲胶;含单宁量在10%以上的有落叶松、云杉、木麻黄、槲树皮等,一般用7—10吨原料 Trichosantal is tannin bark, nutshell, roots, leaves and other raw materials crushed, soaked in hot water, the soaking solution was evaporated to dry, dehydrated, and made of brown powdery or massive solid material .栲 plastic material is rich in resources, many varieties, it is understood that there are more than 40 kinds found. Containing more than 20% of the amount of tannin are bowls, Hua Hong, red root, citrus skin, etc., generally 3 tons of raw materials can produce 1 ton of gum; containing more than 10% of the amount of tannin larch, Spruce, Casuarina, bark oak, etc., generally 7-10 tons of raw materials