Cast iron furnace head: it is processed from castable pig iron. It has texture and weight, and is characterized by high temperature resistance and corrosion resistance. Defects, internal cavities, small holes and trachoma are formed in the casting process. If the manufacturer fails to detect them before leaving the factory, there will be slight air leakage in the later stage. In addition, after the long-term use of cast iron furnace head, the furnace head may have oxidation deformation and adhere to the distributor, resulting in the failure to remove the distributor; Oxidation may also occur, and the volume of the furnace head will become smaller. In the long run, the gap between the furnace and the fire distributor will increase, forming fire leakage at the gap.

　　Ceramic furnace head: after being processed and shaped by iron sheet, the inner and outer surfaces are coated with porcelain substances for protection, lubrication, beauty and rust prevention. The defect is that you can't touch and bump with the flame for a long time. Long term flame high temperature or external force collision will lead to deformation and separation of the outer porcelain at the ceramic furnace head, loss of protection, rust, perforation, air leakage and fire leakage.

　　Aluminum furnace head: also known as aluminum alloy furnace head, its main component is aluminum. Its advantages are simplicity, non rusting and corrosion resistance. The defect is that the die casting cost is high, and the aluminum alloy can not be directly touched with the flame. Therefore, the aluminum furnace head has high requirements for the design and structure of the burning shape of the sub firearm. The furnace head and the flame burned by the sub firearm shall be kept at a specific distance, and the furnace head shall not touch the flame, and shall not be in a high-temperature environment for a long time, otherwise ablation deformation and damage will be formed.

　　Iron furnace head: this kind of furnace head is cheap and simple. It is processed from ordinary iron sheet. Defects: it cannot be used for a long time, and it is easy to rust, corrosion and deformation after a long time. This kind of stove head is mostly used for disposable stove or exported to remote areas abroad.

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