Here are several:
• Sapphire is a multifunctional material
• The raw material for sapphire production is readily available and cheap
• As a rule, the technology of sapphire production is less energy-intensive than alternative materials and allows the growth of large-size crystals
• Sapphire production does not pollute the environment. The growth of sapphire is less harmful than that of alternative materials due to the absence of processes such as electrolysis, pyrometallurgy, the action of aggressive media, and other factors
• Compared to other materials, sapphire possesses higher corrosion and radiation resistance, which results in operational longevity of sapphire articles in aggres-sive media
• Sapphire is characterized by higher biological compatibility than metals and polymers; therefore it is used in medical implants, as a constructional material in biotechnology, in medical instrument-making, and in genetic engineering Today
• Fabrication of substrates for light-emitting diodes, new generations of TV receivers, projectors, and microwave devices
• Fabrication of windows for civilian and military equipment
• Production of bearings and windows for watches and devices
• Making of precious jewels for the jewelry industry
Although there are lots substrates which are regarded as potential materials to replace Sapphire Substrate, it is still dominated in the substrates (for GaN LED growth) market, because of its reasonable price and relatively low mismatch. Zhongju is capable of processing substrates according to customer needs. Currently, our sapphire substrate productions ranges from 2 to 12 inches with high quality and accurate orientation.
Table 1 Size of substrates
| | 2 inches Substrates | 4 inches Substrates | 6 inches Substrates |
| Diameter (mm) | 50.9±0.1 | 100.1±0.1 | 150.1±0.1 |
| Primary Flat Length (mm) | 16±1 | 31±1 | 47.5±1 |
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