Continental Trade Sp. z o. o.

Technical glass

Sapphire products

Sapphire crystals, although found in nature, but most often are produced artificially - said then of synthetic sapphire. This material is prepared from aluminum trioxide Al2O3. Synthetic sapphire retains the characteristics of the natural, crystalline sapphire, such as exceptional hardness (resistance to scratches), high chemical resistance (even the action of hydrofluoric acid), high thermal resistance. It can operate at temperatures up to 2000 ° C and at high pressures. Radiation is passed over a wide range from the ultraviolet to the infrared (250 to 5000 nm).


  • exceptional hardness and high mechanical strength
  • withstand extreme environmental conditions (temperature, pressure, aggressive environment)
  • good transmittance in the range 250 - 5000 nm (UV to IR)
  • very high electrical resistance
  • high dielectric constant

Typical applications:

  • displays (scanners, security screens, PDAs, tablets, clocks, etc)
  • machines for at high temperatures and aggressive environments
  • infrared supervisory systems
  • medical applications (eg. endoscopes, radiometers)
  • substrates for microelectronic and LEDs circuts 


Some properties Sapphire transmittance
Density 3,97 g/cm3 Sapphire transmittance
Modulus of elasticity (Young’s) 335 GPa
Poisson’s ratio 0,25
Mohs hardness 9
Coefficient of linear expansion  8,4  10-6 /°C
Thermal conductivity 2,72 Wm°C
Specific heat @ 25°C 774.4 J/ kg x °C
Melting point 2040°C
Working temperature 2000°C
Tensile strength 0,27– 0,41 GPa
Flexural strength 0,48 – 0,89 GPa
Surface quality
60 - 401)

1) depends on implementation (see here)

Dielectric properties

@ 25°C and 1 MHz: 
   Dielectric constant εr=9,3 
   Loss tangent       tgδ=3,0 x 10–5

Electrical properties

    - @ T=    25 °C  -  1016 Ω 
    - @ T=   500 °C -  1011 Ω 
    - @ T= 1000 °C -  106 Ω

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

Information clause

What personal data are processed and who is their administrator?

When using our services, personal data that we process may be, for example, the IP address of your device, data obtained from cookies or similar mechanisms for recording information in Users' devices, as long as they allow you to identify you. More information about the scope of personal data and cookies can be found in the Cookies policy and in Privacy policy.

Administrator, ie the entity deciding on which personal data will be processed and for what purpose, and in what way, is Continental Trade Sp. z o.o. (hereinafter "Continental Trade" or "We") with its registered office and address in Warsaw at Krasnobrodzka Street 5.

What is the purpose and basis of the processing of your personal data by Continental Trade ?

Continental Trade processes your personal data to enable you to use our services, match the displayed content and ads to your interests, measure quality and effectiveness, improve content and services.

The basis for the processing of personal data is the legitimate interest of Continental Trade. It includes improving services, ensuring their best quality and informing Users about them.

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To whom does Continental Trade share your personal data?

Continental Trade, in principle, does not share your personal data with third parties, except for situations in which Continental Trade has a legal basis, including at the request of authorized entities, or when it is necessary to perform services offered by Continental Trade, e.g. entrepreneurs providing hosting of our services.

How long does Continental Trade store your personal data?

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Who can you contact for more information on the processing of personal data by Continental Trade?

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More information on the protection of your personal data can be found in the Cookie Policy and Security Policy documents published on our website