Corning EXG Glass

Corning EXG® glass is an advanced non-alkali metal aluminosilicate glass developed by Corning Incorporated, offering excellent dimensional stability and high surface quality.

Machining Capability

We specialize in the precision machining of Corning® EXG glass, providing high-precision components and employing advanced polishing and coating processes to meet the stringent requirements of semiconductor and optical applications.

Tolerance ±1um

Flatness 1 µm (Φ300)

Roughness Ra0.002μm

Micropores 0.1mm

Internal Thread M1.2

Max. Size Φ400mm

Advantages

Non-alkaline
Excellent thermal stability
Extremely high surface quality
Chemical resistance

Properties

Corning® EXG glass developed by Corning Incorporated has excellent performance, and its main material properties are shown in the table below.

Mechanical Properties	Unit	EXG
Density	g/cm³	2.38
Shear Modulus	GPa	30
Young's Modulus	GPa	74
Poisson's Ratio	—	0.23

Thermal Properties	Condition	EXG
C.T.E.	0 - 300°C	32 x 10^-7 /°C
Softening Point	10^7.6 poises	972 °C
Annealing Point	10^13 poises	722 °C
Strain Point	10^14.5 poises	669 °C
Thermal Conductivity	at 25°C	1.058 W/(m·K)
Thermal Conductivity	at 500°C	1.447 W/(m·K)

Electrical & Optical	Condition	EXG
Log10 Volume Resistivity	at 25°C	23.6 ohm-cm
Log10 Volume Resistivity	at 250°C	13.3 ohm-cm
Dielectric Constant	23°C, 20% RH, 1kHz	5.3
Dielectric Loss	23°C, 20% RH, 1kHz	0.10%
Refractive Index	at 589.3 nm	1.51
Photo-elastic Constant	—	33.4 (nm/cm/MPa)
Transmittance	400 to 800 nm	> 90%

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Applications

Display panels (LCD, OLED backplanes)
Semiconductor processing substrates
Precision optical components
Precision mechanical components
Thin-film coating carriers
Flat panel and photonics applications

FAQS

Does EXG glass have good optical properties?

Yes, EXG glass provides excellent optical uniformity, high transmission, and low defect levels, which are critical for high-resolution display performance.

Can EXG glass be machined or customized?

Yes, EXG glass can be precision cut, ground, and processed into custom shapes, although it requires controlled handling due to its thinness and application-specific requirements.

What are the key properties of EXG glass?

EXG glass features high thermal stability, low density, excellent flatness, and superior surface smoothness. It is also free from heavy metals such as arsenic and antimony, making it more environmentally sustainable.

Macor is a machinable glass-ceramic made from fluorophlogopite mica crystals embedded in a borosilicate glass matrix. This composition gives it a rare
combination of metal-like machinability, excellent electrical insulation, low thermal conductivity, and stability up to 1000°C (no load) while maintaining very tight tolerances.