Sapphire

Sapphire
Crytur provides synthetic sapphire profiles for demanding technical application 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)

ne = 1.760

Optical transmition

0.18 - 6µm (Total transmition up to 97%)

Graphs