Fused Silica Glass

Very low coefficient of thermal expansion (approximately 0.5 × 10⁻⁶ /°C)

Material	Fused Silica Glass
Density	2.20 g/cm³
Roughness	Ra0.002μm
Maximum size	ф500*50mm

Introduction

Fused Silica Glass is widely used in high-tech fields such as semiconductors, optics, and scientific research due to its excellent physical and chemical properties. It is composed of amorphous materials of high-purity silicon dioxide SiO₂ (>99.9%), which does not contain other oxides and avoids impurities. At the same time, Fused Silica has strong resistance to acids, alkalis and most corrosive substances, and is suitable for extreme chemical environments. The following is a detailed introduction to its characteristics and applications.

Fused Silica Glass Advantages

✅ High purity >99.9% SiO₂

✅ Extremely low thermal expansion coefficient (0.5 × 10⁻⁶ /°C) and strong thermal shock resistance

✅ High resistivity

✅ Strong resistance to chemicals

✅ High transmittance from deep ultraviolet to infrared (175 nm ~ 2500 nm), suitable for optical applications

✅ High mechanical strength, precision polishable surface

Application

✅ Photolithography masks, photolithography machine lenses, wafer carriers, heat treatment boats, cavity windows

✅ Ultraviolet lenses, laser windows, reflector substrates

✅ Infrared/ultraviolet windows, high-speed aircraft windows

✅ Quartz cuvettes, laser cavity lenses

✅ Optical path components for spectrometers and chromatographs

✅ High-temperature gas sensor windows

✅ Microstructure devices, optical trap structures, vacuum cavity windows

✅ Interferometers, gyroscope substrates

Fused Silica Glass Properties

Material Properties

Property	Unit	Fused Silica Glass
Density	g/cm³	2.2
Bending Strength	MPa	80
Compressive Strength	MPa	1100
Elastic Modulus	GPa	220
Poisson’s Ratio	–	0.17
Young’s Modulus	GPa	72

Thermal Properties

Property	Unit	Fused Silica Glass
Thermal Conductivity	W/m·K	1.38
Melting Point	°C	1730
Maximum Operating Temperature	°C	1200
Linear Expansion Coefficient	10⁻⁶/K	0.55

Electrical Properties

Property	Unit	Fused Silica Glass
Dielectric Constant	1 MHz	3.75
Breakdown Voltage	V/cm	400
Dielectric Loss	1 MHz	< 0.0004
Resistivity	Ω·cm	> 10¹⁸

Fused Silica Glass Machining

Fused Silica Glass Manufacturer

High-Purity Fused Silica Glass Manufacturer & Precision Machining Expert
We are a professional manufacturer of high-purity fused silica glass, offering integrated services from material supply to precision CNC machining. With advanced 3-axis, 4-axis, and 5-axis machining capabilities, we produce custom components with ultra-tight tolerances (±0.001 mm), optical-grade polishing (up to 1/20λ), and complex geometries.

Our fused silica parts are widely used in semiconductors, optics, aerospace, analytical instruments, and scientific research. Backed by ISO 9001 and ISO 14001 certifications, we ensure stable quality, fast delivery, and technical support tailored to your critical applications.

FAQ

What is the difference between NEXCERA, Zerodur, and ULE?

NEXCERA is a Japan-made ultra-low-expansion ceramic designed primarily for precision fixtures, metrology bases, and mechanical stability. Zerodur and ULE are glass-ceramics optimized for optical stability and large optical components.

NEXCERA: best for mechanical rigidity, dimensional stability, and precision tooling.
Zerodur: preferred for high-precision optical mirrors and large optical assemblies.
ULE: ideal for lightweight optical elements and interferometry.

NEXCERA focuses on mechanical precision, while Zerodur/ULE focus more on optical homogeneity.

Does NEXCERA have magnetic or electrical conductivity?

No. NEXCERA is non-magnetic and electrically insulating.
It is suitable for environments that require stable, non-conductive, and non-magnetic materials, including semiconductor equipment, metrology systems, and precision automation.

What is the coefficient of thermal expansion (CTE) of NEXCERA?

Typical CTE values for NEXCERA are:
0 ± 0.02 × 10⁻⁶ /K (20–40°C)
This extremely low CTE makes NEXCERA ideal for applications requiring high dimensional stability under temperature changes.

Is NEXCERA the same as cordierite?

No. NEXCERA is not cordierite.
NEXCERA is a high-purity ultra-low-expansion ceramic, engineered for precision applications.
Cordierite is a lower-cost Mg–Al–Si ceramic used mainly for insulation parts, kiln furniture, and honeycomb substrates.
They belong to different material families and serve completely different applications.