First of all, the material requirements for making pipes:
First, the pattern must be beautiful, pleasing to the eye in your hand, entertaining and ornamental.
Second, the material is hard, dense and flame retardant. The second point is far more important than the first.
When making a pipe, you usually choose a knot in one's heart or heather. These two materials have beautiful patterns, hardness and compactness, and excellent fire resistance. They can withstand the heat of cut tobacco and will not be ignited and ablated in a bag of cigarettes.
Let's talk about nanmu. Although there is a word difference between nanmu and sinamu, although it is very valuable, the wood has fragrance, and has the advantages of straight texture and fine structure, and it is not easy to deform and crack. However, its specific gravity is much lighter than that of heather and pear pimple, and its hardness density is low.
Wood itself is a combustible material. The lower the density, the softer the texture and the easier it is to be ignited. The fire in the pipe is dark, without flame, burning bit by bit. The speed of combustion depends on the materials used. Using nanmu as a pipe is flashy, and before long, the pipe may become a funnel.