Product Overview

Fused Quartz Ingot, also known as fused silica ingot, is a high-purity silicon dioxide (SiO₂) material produced through high-temperature melting. As the upstream raw material for various quartz products, fused quartz ingots are widely used in quartz tubes, rods, plates, wafers, and precision quartz optical and semiconductor components. They are essential in the semiconductor, photovoltaic, optical, and high-end industrial sectors.

These ingots offer high purity, low impurity content, excellent thermal stability, ultra-low thermal expansion, and superior optical and chemical stability, making them ideal for high-temperature, high-cleanliness, and high-reliability applications.

Raw Materials and Manufacturing Process

Fused quartz ingots are typically made from natural high-purity quartz sand or synthetic high-purity SiO₂ powder. Depending on the required application, either electric fusion or flame fusion processes are used.

Under high-temperature conditions, the raw material is completely melted and homogenized, then cooled under controlled conditions to form a dense, uniform ingot. Strict control over impurity levels, bubble content, and internal stress ensures the ingot’s consistent performance and reliability for downstream processing.

Features & Advantages

• High SiO₂ Purity
  SiO₂ content can reach 99.99% or higher, with extremely low metallic impurities, suitable for semiconductor and high-end optical applications.

• Excellent Thermal Performance
  High softening point, excellent heat resistance, and low thermal expansion, ideal for high-temperature and thermal cycling environments.

• Stable Chemical Properties
  Resistant to most acids, alkalis, and corrosive media, suitable for chemical and laboratory applications.

• Good Machinability
  Dense and uniform structure, easy to cut, pull, drill, CNC machine, and polish.

• Outstanding Optical Properties
  High transmittance in ultraviolet (UV), visible, and infrared (IR) regions, suitable for various optical systems.

Common Quartz Products Made from Fused Quartz Ingots

Fused quartz ingots are further processed into a wide range of quartz products through cutting, pulling, machining, and precision polishing. Common products include:

1. Quartz Tubes
   Hollow tubes made by high-temperature pulling, offering excellent thermal stability and chemical resistance. Used in semiconductor diffusion furnaces, chemical reaction tubes, light source protection, and laboratory equipment.

2. Quartz Rods / Bars
   Solid rods cut or heat-processed from ingots, with dense structure and stable dimensions. Used in optical processing, laser systems, and quartz device manufacturing.

3. Quartz Plates & Sheets
   Cut, ground, and polished from ingots, these flat components serve as optical windows, observation windows, vacuum chamber viewports, and transparent structural parts.

4. Quartz Wafers
   High-quality wafers sliced, ground, and polished from ingots, offering uniform thickness and surface flatness. Widely used in MEMS, sensors, and specialty optical substrates.

5. Quartz Capillary Tubes
   High-precision tubes with strict inner diameter consistency and surface quality. Used in fiber optics, precise fluid control, analytical instruments, and medical testing.

6. Quartz Optical Components
   Lenses, windows, prisms, and mirrors made from high-purity ingots. Applied in UV, visible, and IR optical systems.

7. Semiconductor Quartz Parts
   Quartz boats, rings, flanges, and supports, critical components in high-temperature semiconductor processing.

8. Custom Quartz Components
   CNC-machined or precision-polished according to drawings or special application requirements, suitable for research and specialized industrial scenarios.

Main Applications

• Semiconductor manufacturing and equipment

• Photovoltaic and renewable energy industries

• Optical and laser systems

• Chemical and laboratory equipment

• Research and specialized industrial applications

Typical Specifications & Customization

• Shapes: Cylindrical, square, or custom geometries

• Dimensions: Diameter, cross-section, and length customizable

• Purity Levels: Industrial, high-purity, or semiconductor-grade

• Internal Quality: Bubble and striae controlled according to standards

• Surface Finish: As-melted or pre-processed

FAQ

Q1: What purity levels are available for fused quartz ingots?
A1: We offer industrial-grade, high-purity, and semiconductor-grade ingots. SiO₂ content can reach 99.99% or higher for high-end applications.

Q2: Can you provide custom dimensions for quartz ingots?
A2: Yes, we can produce ingots in various diameters, lengths, and shapes, including cylindrical, square, and special custom geometries.

Q3: What are the main applications of fused quartz ingots?
A3: They are used to manufacture quartz tubes, rods, plates, wafers, capillaries, optical components, semiconductor parts, and other custom quartz products.

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