Tin resists distilled sea and soft tap water, but is attacked by strong acids, alkalis, and acid salts. Oxygen in solution accelerates the attack. When heated in air, tin forms Sn2, which is feebly acid, forming stannate salts with basic oxides. Characteristics: Silver-white, ductile solid (beta-form). Changes to brittle grey (alpha) tin at temperatures below 18°C but the transition is normally very slow. Soluble in acids, and hot potassium hydroxide solution. Insoluble in water. Elemental tin has low toxicity, but most of it’s compounds are toxic.
The most important salt is the chloride, which is used as a reducing agent and as a mordant in calico printing. Tin salts sprayed onto glass are used to produce electrically conductive coatings.
These have been used for panel lighting and for frost-free windshields. Most window glass is now made by floating molten glass on molten tin (float glass) to produce a flat surface (Pilkington process).
High-purity tin is mainly used for compound semiconductor doping elements, high purity alloy, such as superconducting solder.
Security:it has a stimulating effect on the eyes, skin and mucous membranes. It is widely used in manufacturing porous bronze bearings self-lubricated, structural parts of powder metallurgy, friction discs, sheathing boards of brakes, clutches, metal-graphite electric brushes, diamond grinding wheels, bronze filters, and also used as the additives of rubbers and plastics, and in the production of chemicals.
Read more>> Natural Mineral Salts
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