Tin materials can be divided into: tin foil, tin powder, tin granules (beads, balls), tin profiles (rods, plates, sheets, strips).
Three allotropes of tin: white tin, grey tin and brittle tin.
Tin foil is mainly used in the fields of medicine, chemical industry, light industry, food, art supplies and handicraft production, such as advanced dry capacitors, decoration, decoration materials, microwave oven insulation, packaging of food and alcohol, folk religious activities, as well as the use of tin foil’s flexible, non extrusion, anti-corrosion and waterproof properties for packaging barrel lining of flame retardant, floor glue, synthetic paint and other organic chemical raw materials.
It is also used as a preform in special welding processes.
At present, the production of tin foil is mainly made by hand.
The products are narrow in breadth, uneven in thickness and poor in strength.
They can only be used as handmade flower binding technology products, and are mostly used in religious etiquette.
At present, most of them (about 2000 tons/year) are exported to Taiwan, Hong Kong, Southeast Asia and other places where overseas Chinese live in groups.
In recent years, especially since the 1990s, with the rapid development of the domestic economy, the use and consumption of tin foil are growing rapidly.
The varieties produced are small in scale, which cannot meet the needs of users, leading to the need to import a large number of tin foils (mainly machine-made, large-sized and high-grade tin foils).
It is estimated that the output of mechanical foil with a certain mechanical strength, brightness, finish and thickness (about 40μ) is about 5000 tons in the world.
The major tin foil producers in the world are Germany, the United States, the United Kingdom, the Netherlands, Spain, Australia, etc.
From the current production and consumption of tin foil:
On the one hand, the application and demand scope of tin foil are further expanded;
On the other hand, the emergence of other types of substitutes and the increase in the consumption of substitutes, such as low-cost aluminum foil market competition, the emergence of polyethylene film packaging materials, led to a decline in the consumption of tin foil.
Therefore, in general, the total consumption of tin foil has not significantly improved.
However, in the long run, as tin foil has the advantages and market needs that aluminum foil does not have (such as brightness, non oxidation, non-toxic, corrosion resistance, good resonance performance, etc.), with the continuous improvement of industrial level and quality of life, the production of high-quality, large specification tin foil products has broad market prospects in China.
Tin powder is widely used in electroplating, powder metallurgy structural parts, porous materials, friction materials, metal ceramics, diamond grinding wheels, metal graphite brushes, clutch brake patches, as well as special coatings, flares, rubber, plastics and other organic chemical additives, organic synthetic reducing agents, etc.
At present, the annual demand is more than 500 tons.
With the development of the powder metallurgy industry, its consumption is still growing rapidly.
Tin particles (beads, balls)
2) Tin particles and tin balls are widely used in flux, organic synthesis, chemical production, alloy manufacturing, as well as the assembly of multiple groups of integrated circuits in the electronic industry.
They are also used as reagents and reducing agents for the determination of arsenic and phosphate, and tin plated products.
Tin granules are indispensable tin plating raw materials in the production process of tinplate, and the tin granules used shall be smooth, uniform and bright.
Tin profile (bar, plate, sheet, strip)
Tin profiles are widely used in welding and electroplating industries in the electronic industry.
They are the largest category of tin imports in China, with an annual import volume of about 10000 tons.
There are many varieties, specifications and models, mainly diamond bars, octagonal bars, star bars, anode plates, and various specifications of round tubes.
The price of products is high, and the value added is more than 20% of the price of raw materials.
1) Tin rods (rods) are mainly used in two ways:
First, tin lead alloy bars, which can be used as the ultimate product, often need further processing and stretching to produce solder wires (wires) of different specifications for use in the electronic industry.
The other is pure tin bar, which is used as anode bar for electroplating tin plate.
2) Tin plates can be divided into two categories:
One is tin anode plate used as tin plating anode;
The other is for civilian use, mainly for the food industry or large hotels, using pure tin plate as the panel (console) for food processing.
In the production of tinplate in Japan, the tin anode plate is used as the insoluble anode (i.e., the anode is not changed), which is different from the general electroplating process.
The common process is to use soluble anode, and the anode plate will dissolve itself with the production.