This transparent optical glass made of sapphire crystal has a hardness that ranks nine out of ten in the Mohs scale, making it the hardest material second to diamond. It is also designed to be anti-impact, anti-scratch, and with high electrical resistance, so it withstands the test of time and a perfect choice for optical equipment.

• High hardness - 9H ( second only to Diamond )
• Scratch resistance ( compressive strength 21000kg /cm²)
• Abrasion resistance
• High mechanical strength
• High temperature resistance (Melting point 2050°C)
• Good thermal stability
• High optical production rate