Sapphire

Sapphire

Crytur provides synthetic sapphire profiles for demanding technical applications as well as precise sapphire optics

Key properties

	HEAT RESISTANT Sapphit™ high resistance characteristics make it ideal material for applications operating in extreme conditions such as high temperatures up to 2000°C, extremely high pressure or harsh chemical environments. Sapphit™ tubes retain their shape perfectly until melting point.
	PURE Sapphit™ is grown as single crystal in a strictly controlled environment. The sctrictly controlled production process allows us to chieve very high material purity over 99,995% of Al₂O₃. The implementation of Sapphit into clean processes is without the risk of process contamination.
	DURABLE Just one grade under diamond, sapphire is one of the hardest materials. Sapphit™ components are scratch-proof and extremely wear resistant.
	GAS TIGHT The wall of sapphire profiles is absolutely gas tight which prevents process contamination through material leakage. Sapphit is also very resistant to attacks from aggressive gases.
High thermal conductivity Enormous pressure resistance Transparent, UV to IR transmitive Electrical resistivity Bio compatibility

Technical parameters

Physical properties
Crystallographic structure	Rhombohedral single crystal; R3c
Density	3.98x10³ kg.m-3 (20 °C)
Hardness by Mohs	9
Hardness by Knoop	1800 parallel to ,c' axis (0001) 2200 perpendicular to ,c' axis
Tensile strength	2.1x10⁹ N.m^-2 (25 °C)
Compressive strength	3.0x10⁹ N.m^-2 (25 °C)
Young's modulus of elasticity	4.6x10¹¹ N.m^-2 (25 °C)
Modulus of rupture	0.7x10⁹ N.m^-2 (25 °C)
Coefficient of friction	0.15 - against steel

Thermal properties
Melting point	2053 °C (3727 °F)
Thermal expansion	6.6x10^-6 °C^-1 (20-50 °C) parallel to ,c' axis 5.0x10^-6 °C^-1 (20-50 °C) perpendicular to ,c' axis
Thermal conductivity	42 W.m^-1.K^-1
Specific heat	0.75x10³ J.kg^-1.K^-1
Maximum operating temperature	2000 °C (3632 °F)

Electrical properties
Resistivity	1x10¹⁸ Ω.m (25 °C)
Dielectric constant	11.5 parallel to ,c' axis 9.3 perpendicular to ,c' axis (10³ - 10¹⁰ Hz)
Dieletric loss tangent	3x10^-5 parallel to ,c' axis 8.6x10^-5 perpendicular to ,c' axis
Dielectric strenght	48x10⁶ V.m^-1 (60 Hz)

Optical properties

Index of refraction

n₀ = 1.768 (Sodium D-line)

n_e = 1.760

Optical transmition

0.18 - 6µm (Total transmition up to 87%)

Graphs