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fused silica

Name: fused silica
Brand: Lexen Industries and Minerals
Price: 15.0 INR
Availability: InStock

Price 15.0 INR/ Piece

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MOQ : 1 Ton

fused silica Specification

Surface Finish
Smooth, vitrified

Usage & Applications
Optical windows, lenses, crucibles, laboratory equipment, firings, refractory linings

Water Absorption
~0%

Purity(%)
>99.8%

Form
Solid

Density
2.2 Gram per cubic centimeter(g/cm3)

Melting Point
Approximately 1713C (3115F)

Application
Used in high-temperature applications, optical components, semiconductor industry, and furnace linings

Hardness (%)
Mohs Hardness: 5.5-6.5

Chemical Composition
SiO2 (Silicon Dioxide) >99.8%

Product Type
Industrial/Technical Glass, Refractory Material

Types of Refractories
Acidic Refractory

Shape
Sheets, tubes, rods, custom shapes

Porosity
Less than 0.1%

Dimensional Stability
Excellent at high temperatures

Strength
Compressive Strength: 1100 kg/cm2 (approx)

Specific Gravity
~2.20 g/cm3

Thermal Conductivity
~1.35 W/mK at 20C

Color
Translucent to white

Thermal Shock Resistance
Excellent

Transparency
>90% (in visible range; for clear fused silica)

Thermal Expansion Coefficient
0.54 x 106/K

Working Temperature (Short-term)
Up to 1650C

Electrical Resistivity
7x1018 cm at 25C

Acid Resistance
Excellent, except HF acid

Alkaline Resistance
Good

Grain Size
Customizable, standard options available

Maximum Service Temperature
1200C continuous

Refractive Index
1.458

Softening Point
1665C

fused silica Trade Information

Minimum Order Quantity
1 Ton

Supply Ability
500 Tons Per Month

Delivery Time
7 Days

About fused silica

Fused silica is a highpurity, amorphous form of silicon dioxide engineered for demanding hightemperature and precision applications. Produced by electrically fusing selected quartz and rapidly cooling the melt, it offers extremely low thermal expansion, excellent thermal shock resistance, high softening point and outstanding chemical inertness compared with conventional silica sand or glass.

Because of this unique property profile, fused silica is widely used in investment casting shells, precision foundry refractories, kiln furniture, slide gates, hightemperature linings, as well as in specialty glass, optics, semiconductor, photovoltaic and fibreoptic components where dimensional stability, purity and low thermal distortion are critica

Fused silica is used wherever very low thermal expansion, high purity and thermal shock resistance are required.

Hightemperature & refractories

Investment casting shells and cores for precision castings (steel, superalloys, turbine parts).
Refractory shapes, gunning mixes, kiln furniture, ladle and tundish linings, slide gates and burner blocks in steel and glass industries.

Glass, optics & photonics

Optical windows, lenses, prisms and wafers for UV to IR applications (lasers, lithography, sensors).
Semiconductor and photovoltaic components, crucibles and tubes requiring very low thermal expansion and high purity.

Industrial powders & fillers

Fused silica powder as a lowexpansion filler in epoxy encapsulants, electronic packaging, potting compounds and engineering plastics to reduce CTE and improve dimensional stability.

Unmatched Thermal and Chemical Stability

Fused silica exhibits low thermal expansion, excellent thermal shock resistance, and superb acid resistance, except against hydrofluoric acid. Its stability under high temperatures and harsh chemicals ensures longevity and reliability, making it a preferred material for critical high-temperature and high-purity applications.

Optimal Transparency & Purity for Optical Precision

With over 99.8% SiO2 content and transparency exceeding 90% in the visible range, clear fused silica is indispensable for optical windows, lenses, and precision instrumentation. Its consistent refractive index and low impurity levels guarantee exceptional visual clarity and performance.

Versatile Formats to Suit Every Need

Fused silica is available in various customizable shapes including sheets, tubes, rods, and other specialized forms. Its consistent density, ultra-low porosity, and smooth vitrified surface finish cater to a wide range of industrial and laboratory uses.

FAQ's of fused silica:

Q: How does fused silica maintain its dimensional stability at high temperatures?

A: With a very low thermal expansion coefficient (0.54 x 106/K) and high softening (1665C) and melting points (about 1713C), fused silica resists deformation and retains its shape even in continuous operations up to 1200C or short-term exposures up to 1650C.

Q: What benefits does fused silica offer in optical applications?

A: Its high purity (>99.8% SiO2), low refractive index (1.458), minimal absorption, and over 90% transparency in the visible range make fused silica ideal for manufacturing optical windows, lenses, and precision laboratory equipment requiring clarity and stability.

Q: Where is fused silica commonly used in industry?

A: Fused silica is widely utilized in high-temperature furnace linings, the semiconductor industry, laboratory apparatus, optical components, and refractory linings owing to its resilience, chemical purity, and customizable shape options.

Q: What is the typical process for forming fused silica components?

A: Manufacturing fused silica starts with melting high-purity quartz sand at ultra-high temperatures, followed by molding into required forms such as rods, tubes, or sheets. It is then annealed to relieve internal stresses and achieve a smooth, vitrified surface finish.

Q: Does fused silica absorb water or react with chemicals?

A: Fused silica has almost zero water absorption (~0%) and shows excellent acid resistance, except with hydrofluoric acid. It also has good resistance to alkalines, making it suitable for chemically demanding settings.

Q: What types of shapes and grain sizes are available for fused silica?

A: Standard and customizable grains, as well as shapes such as sheets, tubes, rods, and specialty forms, are available from manufacturers. These can be tailored to meet specific application requirements.

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