Single Crystal Sapphire

Fully transparent, with highly uniform optical and mechanical properties

The chemical composition of single crystal sapphire is α-alumina, which is transparent, colorless, high hardness, small thermal expansion, acid and alkali corrosion resistance, and not easily corroded by chemical substances.

Advantages

High hardness and wear resistance
High light transmittance
Biocompatible
High resistance to most acids, bases and solvents
Low thermal expansion coefficient (8×10⁻⁶/K)
High electrical insulation

Applications

Lenses, windows, prisms, laser cavity windows
Watch mirrors, mobile phone protective covers
Semiconductor substrates and bases
Ultra-high vacuum components
Precision mechanical components
Light guide display windows
Medical endoscope windows, ultrasound probe protection windows
Fluid Control Water Valve Disc

Single Crystal Sapphire Properties

Mechanical properties

Property	Unit	Sapphire
Density	g/cm³	3.98
Vickers hardness	HV	2000
Bending strength	MPa	400
Compressive strength	MPa	2000
Elastic modulus	GPa	370
Toughness	MPa·m¹/²	3.5
Poisson’s ratio	—	0.23
Young’s Modulus	GPa	370

Thermal Properties

Property	Unit	Sapphire
Thermal conductivity	W/mK	46
Melting point	°C	2050
Maximum operating temperature	°C	2000
Linear expansion coefficient	10⁻⁶/K	8

Thermal Expansion

Property	Unit	Sapphire
Dielectric constant	1 MHz	9.3
Breakdown voltage	V/cm	30
Dielectric loss	1 MHz	≤10⁻⁴
Resistivity	Ω·cm	≥10¹⁶

Note: This value is for reference only and may vary slightly depending on the batch conditions.

Single Crystal Sapphire Machining Manufacturer

Jundro Ceramics is a professional ultra-hard materials machining manufacturer and factory, which can achieve high-precision machining of Single Crystal Sapphire, support special-shaped, curved, lightweight, micro-pores (φ0.1mm) to achieve ultra-high finish of Ra0.002um. If you have a related project that requires ultra-hard materials machining in the near future, please let us share some of the work for you! Experience our advantages for yourself: one-to-one engineering support, single point of contact, highly competitive prices, on-time delivery and quality control