Sapphire

Property	Unit	Grade
Melting temperature	°С	2050
Density	g/cm³	3,98
Thermal conductivity	W/(m·К)	46,06
Coefficient of thermal expansion (CTE) parallel to axis С	10^-6/°С	6,7
Coefficient of thermal expansion (CTE) square with axis С	10^-6/°С	5,0
Dielectric constsnt (10³ - 10⁹ Гц, 25°C) square with axis С	-	9,3
Dielectric constant (10³ - 10⁹ Гц, 25°C) parallel to axis С	-	11,5
Tensile strength - 25° С - 500° С - 1000° С	MPa/mm²	400 275 345
Bending strength	MPa	350-390
Compressive strength	GPa	2,0
Modulus of elasticity	GPa	360-440
Volume resistivity - 25° С - 500° С - 1000° С	Ohm•cm	10¹⁶ 10¹¹ 10⁶

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