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precision sphere

Sapphire precision sphere

Size from 0.20 mm to 20.00 mm Al203 Hexagonale rhomboedrique Density 3,99 - 3,98 Fusion Temperature 2050°C Thermal expansion 5,4 x 10-6/°C face perp. axe C 6,2 x 10-6/°C face paral. axe C Hardness Mohs 9 Hardness Knoop 1800 face perp. axe C 2200 face paral. axe C 1,769 face paral. axe C Dispersion factor 0.011
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