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  • Ceramic glass round shaped
  • Ceramic glass round shaped
  • Ceramic glass round shaped
  • Ceramic glass round shaped
  • Ceramic glass round shaped

Ceramic glass round shaped

4MM black ceramic board round shaped
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Glass-ceramics are polycrystalline materials produced through controlled crystallization of base glass. Glass-ceramic materials share many properties with both glasses and ceramics. Glass-ceramics have an amorphous phase and one or more crystalline phases and are produced by a so-called "controlled crystallization" in contrast to a spontaneous crystallization, which is usually not wanted in glass manufacturing.

Glass-ceramics have the fabrication advantage of glass as well as special properties of ceramics. Glassceramics do not require brazing but can withstand brazing temperatures up to 700 °C.Glass-ceramics usually have between 30% [m/m] to 90% [m/m] crystallinity and yield an array of materials with interesting properties like zero porosity, high strength, toughness, translucency or opacity, pigmentation, opalescence, low or even negative thermal expansion, high temperature stability, fluorescence, machinability, ferromagnetism, resorbability or high chemical durability, biocompatibility, bioactivity, ion conductivity, superconductivity, isolation capabilities, low dielectric constant and loss, high resistivity and break-down voltage.

These properties can be tailored by controlling the base glass composition and by controlled heat treatment/crystallization of base glass. In manufacturing, glass-ceramics are valued for having the strength of ceramic but the hermetic sealing properties of glass.


Constituent Structural formula Persentage(%)
Silicon dioxide SiO2 50 - 80
Aluminum oxide Al2O3 15 - 27
Lithium oxide Li2O 0 - 5
Zinc oxide ZnO 0 - 5
Titanium oxide TiO2 0 - 5
Cobaltous oxide ZrO2 0 - 5
Magnesium oxide MgO 0 - 8
Calcium oxide CaO 0 - 8
0 - 10
Physical properties
Density P 2.5~2.6 g / cm^3
Elastic modulus E 84~95 x 10^3 Mpa
Poisson ratio V 0.25~0.26
Knoop hardness HK 0.1/20 570~680
Bending strength σb 100~160
Linear expansion αl -1.5~5 x 10-7/°C
Thermal shock resistance 760 °C
Moh’s strength around 5

Impact strength
It is very important for impact resistance that it is according to the final design of the glass, as well as the hole size and the location of the hole. Also assembly way and thickness of the glass will change the impact strength. Consultant with details.
Chemical properties
Acid resistance max corrosion 0.25 mg / cm^2
5% HCL 90°C 24 hrs temperature 20°C

Alkali resistance max corrosion 0.30 mg / cm^2
5% NaHCO3 90°C 24 hrs temperature 20°C

Alcohol scratch no corrosion
99.9% alcohol temperature 20°C scratch 15 times in a pressure 3~5N

Boiling water resistance no corrosion or crack
100°C boiling water for 360 hrs
Impact resistance
9 points should be chosen for percussion hammer to contact the top surface of the selected glass. 5 seconds per hit and finished all the test in one minute for all 9 hits. Each point hit just one time. Hammer range 0.7 J. For hole models please carefully consultant with the manufacturer. More thickness
will provide better impact result.
No of the cutting hole and the shape are very important to this character.
 Thermal shock
Specific heat Cp( 20-100 °C) 0.8 - 0.85 J/(g x k)
Heat conductivity λ ( 90°C ) 1.5 - 1.7 W / (m x k)
Working temperature 760°C


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