Custom Quartz Thermal Insulation Plate for Photovoltaic Furnace Systems

The Quartz Thermal Insulation Plate, also known as a quartz thermal barrier plate or quartz furnace heat shield, is installed around the entrance or exit of a photovoltaic or semiconductor furnace tube.

Multiple quartz plates are typically arranged at controlled intervals using a matching slotted quartz holder. Together, they form a layered thermal barrier assembly that helps control radiant heat transfer, reduce heat loss around the furnace opening, stabilize the local thermal environment, and protect surrounding furnace components.

Manufactured from high-purity fused quartz or opaque fused quartz, the plate offers low thermal expansion, good thermal-shock resistance, high-temperature compatibility, and low contamination potential. Custom machining is available for circular plates, rectangular plates, center openings, slots, notches, positioning holes, and special installation profiles.

Key Features

High-Purity Quartz Material

High-purity fused quartz helps reduce the risk of metallic contamination in photovoltaic and semiconductor thermal-processing environments.

Low Thermal Expansion

Fused quartz has a very low coefficient of thermal expansion, helping the plate maintain dimensional stability during heating and cooling cycles.

Layered Thermal-Barrier Design

When multiple plates are installed with controlled spacing, the assembly helps limit radiant and convective heat transfer around the furnace tube opening.

Thermal-Shock Resistance

Fused quartz performs well under temperature changes when the plate is correctly designed, installed, heated, and cooled.

Precision Machining

CNC cutting, drilling, grinding, slotting, and edge finishing are available to ensure compatibility with the furnace tube, holder, and surrounding assembly.

Custom Geometry

Plate diameter, thickness, openings, notches, mounting features, and surface condition can be manufactured according to drawings or samples.

Product Specifications

The Ø420 × 5 mm specification is a reference size for the displayed product. All dimensions can be customized.

How the Quartz Insulation Plate Works

The quartz plate is generally used as part of a multi-layer insulation assembly rather than as a standalone insulating material.

Several plates are inserted into a slotted quartz holder with a controlled air gap between adjacent plates. This structure helps:

• Reduce direct radiant heat transfer
• Limit heat loss around the furnace opening
• Protect nearby seals and mechanical components
• Reduce thermal exposure outside the furnace tube
• Maintain consistent plate positioning
• Improve the stability of the furnace entrance assembly
• Simplify inspection and replacement during maintenance

Actual thermal performance depends on the number of plates, plate spacing, surface condition, furnace temperature, airflow, plate thickness, and installation position.

Material Options

Transparent Fused Quartz

Suitable when high purity, visual observation, or controlled infrared transmission is required.

Opaque Fused Quartz

Contains a controlled microstructure that increases light scattering and reduces direct radiant heat transmission. It is often selected for furnace heat-shield and thermal-barrier applications.

Frosted or Ground Quartz

A ground or frosted surface can increase light scattering and may be specified according to the thermal design and installation requirements.

The most suitable quartz grade should be selected according to the required purity, thermal behavior, mechanical conditions, and furnace atmosphere.

Product Advantages

• Suitable for high-temperature furnace assemblies
• Low coefficient of thermal expansion
• Good resistance to thermal cycling
• Low metallic contamination potential
• Precision-machined dimensions
• Custom openings, slots, and edge profiles
• Compatible with slotted quartz holders
• Easy to inspect and replace
• Suitable for clean manufacturing environments
• Prototype and batch production available
• Matching holders can be supplied
• Custom packaging available for fragile components

Typical Applications

• Photovoltaic diffusion furnaces
• Solar cell manufacturing equipment
• Furnace tube entrance and exit insulation
• Semiconductor diffusion furnaces
• Semiconductor oxidation furnaces
• LPCVD and thermal-processing equipment
• Quartz furnace assemblies
• High-temperature reaction systems
• Laboratory tube furnaces
• Industrial heat-treatment equipment
• Custom quartz thermal-barrier assemblies

Custom Design Options

We can manufacture quartz insulation plates with:

• Customized outer diameters
• Different plate thicknesses
• Central holes or large openings
• Edge notches and positioning slots
• Mounting or alignment holes
• Stepped or recessed profiles
• Ground or polished surfaces
• Chamfered or rounded edges
• Customized flatness and tolerances
• Transparent, opaque, or frosted quartz
• Matching multi-slot quartz holders
• Complete plate-and-holder assemblies

For replacement parts, production can be based on a technical drawing, CAD file, physical sample, or measured equipment dimensions.

Manufacturing Process

A typical production process includes:

1. Quartz material and grade selection
2. Raw plate cutting
3. CNC profile machining
4. Hole, slot, and cutout processing
5. Surface grinding or polishing
6. Edge chamfering and finishing
7. Stress-relief treatment when required
8. Precision cleaning
9. Dimensional inspection
10. Visual inspection
11. Protective packaging

The manufacturing process is adjusted according to plate diameter, thickness, opening geometry, surface requirements, and order quantity.

Quality Inspection

Each quartz thermal insulation plate can be inspected for:

• Outer diameter or overall dimensions
• Plate thickness
• Opening and cutout dimensions
• Hole and slot positions
• Flatness
• Parallelism
• Surface condition
• Edge quality
• Chips and cracks
• Scratches and machining defects
• Material appearance
• Cleanliness
• Fit with the corresponding holder

Inspection reports can be provided according to the agreed technical requirements.

Information Required for Quotation

Please provide:

1. Plate shape and overall dimensions
2. Plate diameter, if circular
3. Plate thickness
4. Central opening dimensions
5. Hole, slot, or notch layout
6. Surface-finish requirements
7. Edge-treatment requirements
8. Flatness and dimensional tolerances
9. Quartz material or purity requirements
10. Maximum operating temperature
11. Heating and cooling cycle conditions
12. Furnace atmosphere
13. Required quantity
14. Technical drawing, CAD file, or physical sample

If the plate will be installed in an existing quartz holder, please also provide the slot width, slot depth, and required assembly clearance.

Packaging

Quartz plates are fragile and require suitable packaging protection. Available packaging methods include:

• Clean protective wrapping
• Individual plate separation
• Soft foam or EPE cushioning
• Custom-cut foam inserts
• Reinforced export cartons
• Wooden cases for large-diameter or batch orders

Large-diameter plates can be individually separated to reduce contact, scratching, and edge damage during transportation.

FAQ

1. What is the function of a quartz thermal insulation plate?

It is used as part of a thermal-barrier assembly near a furnace tube opening. Multiple plates installed with controlled spacing help limit radiant heat transfer and protect nearby furnace components.

2. Is Ø420 × 5 mm the only available size?

No. Ø420 mm with a 5 mm thickness is a reference specification. Diameter, thickness, openings, and other dimensions can be customized.

3. Can transparent and opaque quartz materials both be supplied?

Yes. Transparent, opaque, ground, and frosted quartz options are available. Opaque quartz is often selected when reducing direct radiant heat transmission is an important requirement.

4. Can the plate be manufactured from a drawing or sample?

Yes. We support production based on technical drawings, CAD files, equipment dimensions, or physical samples.

5. Can special holes, slots, or cutouts be added?

Yes. Central openings, positioning holes, edge notches, mounting slots, and custom profiles can be precision-machined according to the drawing.

6. Can matching quartz plate holders be supplied?

Yes. We can manufacture matching multi-slot quartz holders and supply the plates and holder as a complete furnace insulation assembly.

7. Is the plate suitable for continuous operation at 1,100°C?

Fused quartz may be suitable for this temperature range, but long-term performance depends on quartz grade, plate size, thickness, mechanical loading, mounting method, furnace atmosphere, and thermal cycling. The complete operating conditions should be reviewed before confirming the specification.

8. How should the plate thickness be selected?

Thickness should be selected according to plate diameter, holder-slot width, installation orientation, mechanical support, thermal conditions, required service life, and allowable deformation.