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Quartz Glass Products & Custom Fused Silica Fabrication
FGQuartz is a high-purity quartz glass manufacturer and supplier of seven core product lines: quartz glass tubes, rods, plates, wafer boats, crucibles, tanks, and inline heaters. It also provides fully custom fused silica fabrication to your drawing for semiconductor, solar, optical, fiber-optic, and laboratory applications.
All products are SiO₂ ≥ 99.99% fused silica, made under an ISO 9001 system, and available from a single prototype (no MOQ) to OEM production volumes. Quotes are typically returned within 24 business hours.
Quick answer
What does FGQuartz supply? Seven core quartz glass product lines (tubes, rods, plates, wafer boats, crucibles, tanks, and inline heaters) plus custom fused silica fabrication, all SiO₂ ≥ 99.99%, with no minimum order quantity.
Key takeaways
- Each product line is available in standard and custom configurations; anything outside them is built to drawing through custom fabrication.
- Optical grades JGS1 / JGS2 / JGS3 and opaque fused silica are available where the application needs them.
- CNC diamond machining and oxy-hydrogen flame forming and welding are done in one ISO 9001 plant, in operation since 2005.
- Export experience to 40+ countries with compliance documentation and custom export packaging.
Written by the FGQuartz Engineering Team · Updated October 2026
On this page: Product finder · Product portfolio · Material basics · Quartz vs alternatives · By industry · Capabilities · How to choose · Why FGQuartz · FAQ and quote
Lead time depends on size and drawing complexity; the quote confirms the schedule.
Quick product finder
Product finder
Not sure which product line fits? Use this table to find a starting point; full detail follows below.
| Product | Typical dimension range | Best for |
|---|---|---|
| Quartz Tubes | OD 5–1000 mm | Furnace and process tubes, diffusion, CVD liners, fiber-optic substrates |
| Quartz Rods | OD 3–300 mm | Structural supports, fiber preform rods, laboratory stirring rods |
| Quartz Plates & Windows | 0.5–50 mm thick, up to 1200 × 1200 mm | Vacuum viewports, optical windows, process base plates |
| Quartz Wafer Boats | 2–12 in wafers, 25–150+ slots | Semiconductor and solar diffusion, oxidation, LPCVD |
| Quartz Crucibles | 10 ml lab to 32 in CZ crucibles | CZ / MCZ silicon pulling, calcination, laboratory analysis |
| Quartz Tanks | 50–1500 mm+, 1–200+ liters | Semiconductor wet benches, chemical process baths |
| Quartz Inline Heaters | Sized to flow rate and chamber design | Flow-through heating of DI water and high-purity chemicals |
| Custom Fabrication | Any dimension, any geometry | Anything that does not fit a standard catalogue size: labware, optics, reverse-engineered parts |
Complete quartz glass product portfolio
Portfolio
All products are fused silica with SiO₂ ≥ 99.99%, controlled dimensional tolerances, and high thermal resilience. Below is the full range with typical applications and customization options.
What they are: High-purity fused silica tubes used as process chambers, furnace tubes, diffusion tubes, CVD liners, substrate tubes, and high-temperature conduits, from OD 5 mm to 1000 mm.
We manufacture: standard and large-diameter tubes · thick-wall and thin-wall tubing · flanged and threaded tubes · tubes with side ports and gas manifolds · bent tubes · multi-section welded assemblies · tubes with domed or flat sealed ends · custom tube structures to CAD.
Primary applications: semiconductor diffusion and LPCVD, solar diffusion, fiber-optic MCVD substrate and preform tubes, laboratory reaction tubes, high-temperature furnace systems.
Key specifications: outer diameter, inner diameter, wall thickness, length, concentricity, end configuration, surface finish.
Customization: cutting, drilling, slotting, flange welding, bending, sealing, fire polishing, multi-section assembly.
What they are: Solid fused silica rods used for structural support, fiber preform target and starting rods, laboratory stirring, and precision fixtures, typically from 3 mm to 300 mm in diameter.
We manufacture: standard solid rods · centerless-ground rods · custom diameter and length · rods with CNC holes, grooves, or threads · special end machining (chamfers, optical polish) · custom rod assemblies.
Primary applications: fiber-optic preform manufacturing, laboratory equipment, high-temperature structural supports, optical rod components.
Key specifications: diameter, length, straightness, surface finish, end configuration.
Customization: precision grinding, CNC features, end polishing, custom lengths.
What they are: Process-grade and optical-grade quartz plates, discs, and windows with high flatness and broad spectral transmission (JGS1 / JGS2 / JGS3), for vacuum viewports, optical substrates, and high-temperature observation.
We manufacture: standard plates and discs · optical windows · plates with CNC-drilled holes and slots · stepped plates · custom shapes · custom plate structures.
Primary applications: optical systems, laser windows, semiconductor process monitoring, laboratory spectroscopy, high-temperature viewports.
Key specifications: length × width × thickness, flatness, parallelism, surface quality, optical grade.
Customization: precision cutting, grinding, optical polishing, CNC machining of complex features.
What they are: Quartz wafer boats for semiconductor oxidation, diffusion, and LPCVD furnaces, for 2–12 inch wafers, with low particle generation, controlled slot spacing, and uniform thermal behavior.
We manufacture: semiconductor wafer boats · solar PV cell boats · wafer carriers · custom CNC slot profiles · multi-piece boat structures · custom boats to OEM print.
Primary applications: semiconductor diffusion, oxidation, and LPCVD; solar diffusion and annealing.
Key specifications: wafer size, slot count and pitch, overall length, width, and height, surface condition.
Customization: CNC slotting, custom geometry, multi-piece assemblies to OEM drawings.
What they are: Thermal-shock-resistant quartz crucibles for CZ / MCZ silicon crystal pulling, chemical analysis, and high-temperature powder calcination, across a range of capacities with low contamination.
We manufacture: CZ / DS crystal pulling crucibles · custom-capacity laboratory crucibles · heavy-wall crucibles · custom-shaped reaction crucibles · lidded and spouted designs.
Primary applications: semiconductor and solar silicon crystal growth, laboratory calcination and chemical processing.
Key specifications: diameter, height, wall thickness, shape, capacity, surface condition.
Customization: custom dimensions and geometries to match specific pullers or experimental setups.
What they are: Quartz tanks and baths for high-temperature wet processing, semiconductor wet benches, and chemical laboratory equipment, made from fused silica for chemical inertness and leak-tight welded seams.
We manufacture: rectangular and cylindrical tanks · custom-volume tanks to drawing · tanks with flanges, drains, and covers · overflow, cascade, and multi-chamber tanks · integrated tank assemblies.
Primary applications: semiconductor wet benches, laboratory chemical processing.
Key specifications: internal dimensions, wall thickness, port locations, sealing method.
Customization: custom volumes, port configurations, integrated assemblies to drawing.
What they are: Flow-through heater chambers in fused silica for heating DI water and high-purity chemicals, with no metal contact on the wetted path.
We manufacture: straight-through and coiled-path heaters · circulating heaters for wet-bench loops · flanged heaters · gas preheaters · custom heater assemblies to CAD.
Primary applications: semiconductor wet benches, chemical processing, DI water heating, solar wet-process steps, laboratory circulating loops.
Key specifications: chamber diameter and flow path, connection type, heating power, mounting.
Customization: chamber geometry, port configuration, flange interfaces, build-to-print from process data.
Beyond the seven standard lines, FGQuartz builds fully custom fused silica components to your CAD drawings: labware, heater chambers, optical assemblies, reverse-engineered legacy parts, and anything else fused silica can be shaped into. Thermal processing (flame forming and welding) and cold processing (CNC machining, grooving, optical polishing) are combined to make complex, application-ready parts, with no minimum order quantity.
Quartz glass material basics
Materials
Fused silica is amorphous high-purity silicon dioxide. In industrial purchasing, quartz glass, fused quartz, and fused silica refer to the same family of material. The distinction that matters is feedstock: fused quartz is melted from natural quartz crystal, and fused silica is synthetic, usually from SiCl₄. Synthetic material is purer and more optically homogeneous; natural fused quartz is the usual workhorse for tubes, boats, and crucibles.
Optical grades JGS1 (about 185–2500 nm), JGS2 (about 220–2500 nm), and JGS3 (about 260–3500 nm) are chosen by working wavelength, and opaque fused silica is used for thermal insulation and heat shields. Quartz is not suitable for HF, hot concentrated phosphoric acid, or hot strong alkalis. See What is quartz glass?, quartz vs borosilicate, and the JGS grade guide.
Typical properties of fused silica
Typical values for high-purity fused silica. Optical transmission and OH content vary by grade.
| Continuous service | 1200°C |
| Short-term maximum | 1300°C |
| Softening point | ≈ 1680°C |
| Annealing point | ≈ 1215°C |
| Strain point | ≈ 1120°C |
| Thermal expansion (20–300°C) | 5.5 × 10⁻⁷ /°C |
| Thermal conductivity (20°C) | ≈ 1.4 W/(m·K) |
| Density | ≈ 2.2 g/cm³ |
Chemical note: excellent resistance to HCl, HNO₃, H₂SO₄, aqua regia, and organic solvents. Attacked by HF, hot concentrated phosphoric acid, and hot strong alkalis.
Quartz glass vs other high-temperature materials
Material comparison
Typical handbook values for orientation. Exact figures depend on grade and supplier.
| Property | Fused quartz | Borosilicate 3.3 | 99.7% alumina |
|---|---|---|---|
| Continuous use | ≈ 1200°C | ≈ 500°C | ≈ 1600°C or higher |
| Thermal expansion | ≈ 5.5 × 10⁻⁷ /°C | ≈ 3.3 × 10⁻⁶ /°C | ≈ 8 × 10⁻⁶ /°C |
| Thermal shock | Excellent | Moderate | Limited; heat slowly |
| Transparency | UV to near IR (grade dependent) | Visible; cuts off deep UV | Opaque |
| Main limits | HF, hot phosphoric acid, hot alkali | Low maximum temperature | No visual access; shock risk |
See quartz glass vs borosilicate glass for detail.
Quartz products by industry
Industry solutions
Which product lines are typically specified in each industry.
| Industry | Typical products | Application page |
|---|---|---|
| Semiconductor | Process tubes, wafer boats, rods, plates, tanks, inline heaters, crucibles | Semiconductor quartz glass |
| Solar / photovoltaic | Diffusion tubes, large-format cell boats, crucibles, plates, tanks | Solar quartz glass |
| Fiber optic | Substrate and jacketing tubes, preform target and starting rods | Fiber optic quartz |
| Laboratory | Crucibles, boats, tubes, rods, glassware, plates | Laboratory quartz |
| Optical and UV | Windows, plates, rods, UV-grade tubes | Optical quartz glass |
| High-temperature furnaces | Furnace tubes, liners, rods, plates, boats | High-temperature quartz |
In a typical diffusion furnace, the process tube, wafer boat, supporting rods, and end plates are all fused silica from one material system.
Advanced quartz glass fabrication capabilities
Capabilities
Manufacturing covers both thermal processing and cold machining:
- CNC grooving and slotting — multi-axis slotting for wafer boats, carriers, and fixtures.
- Precision drilling — accurate hole placement for gas injectors, flanges, and fluid ports.
- Thread machining — internal and external threads for modular assembly.
- Cutting and slicing — length and profile cutting of tubes, rods, and blocks.
- Grinding and polishing — dimensional finishing, edge chamfering, and optical surface quality.
- Dimensional machining — control of OD, ID, wall thickness, flatness, and concentricity.
- Thermal tube bending — stress-relieved bends for gas delivery and process routing.
- Thermal forming — shaping, expanding, and slumping of quartz profiles.
- Welding — flame-welded seams and butt joints for multi-section tubes.
- Flange and port welding — flanges, ball joints, and side arms on process chambers.
- Multi-part assemblies — all of the above combined into integrated components.
- Build-to-print OEM — manufacture strictly to your CAD drawing (DXF / STEP / IGES / PDF).
If your process needs a specific quartz structure, FGQuartz has the equipment to make it.
How to choose the right quartz glass product
A practical sequence used by process engineers and procurement teams:
- Define the process — temperature range, chemical environment, optical requirements.
- Identify the function — containment, wafer support, optical access, structural support.
- Select the product family — use the product finder above.
- Specify critical dimensions and features.
- Decide standard or custom — if catalogue sizes do not match, prepare a drawing or sample for custom fabrication.
- State quantity, surface finish, and tolerance.
- Submit for engineering review.
Application context allows more accurate material and process recommendations.
What to provide for a quote
For an accurate quotation, supply as much of this as available:
- Drawing (DXF, STEP, IGES, PDF) or a dimensioned sketch
- Product type and critical dimensions
- Application or process description
- Operating temperature and chemical environment
- Required surface finish or optical grade
- Quantity (prototype and production)
- Special features such as ports, slots, flanges, bends, threads
If no complete drawing exists, a photograph of an existing part with key dimensions and intended use is often enough for an initial assessment.
Why specify FGQuartz
Manufacturer
Frequently asked questions
FAQ
Quotations are typically returned within 24 business hours after you submit your drawing, dimensions, or application requirements.
Yes. FGQuartz has export experience to 40+ countries, with full compliance documentation and custom export packaging for international shipment.
If your requirement matches a standard dimension range and doesn’t need added features (flanges, ports, specific grades), a standard product will work. If it needs a non-standard size, shape, or feature, it belongs on our custom fabrication page.
No. FGQuartz accepts single-piece prototype orders with no MOQ across all product lines, and the same tooling typically scales to production volume later.
All standard products are manufactured to SiO2 purity ≥99.99%, with optical-grade JGS1/JGS2/JGS3 materials available for applications requiring specific UV, visible, or infrared transmission.
FGQuartz manufactures seven core product lines — quartz tubes, rods, plates, wafer boats, crucibles, tanks, and inline heaters — plus fully custom fused silica fabrication for any requirement outside these standard categories.
Request a fabrication quote
How to order
Send your technical specifications, 3D / 2D CAD drawings, or application requirements. Whether you need standard stock products or complex custom structures with grooves, tapped holes, precision flanges, or multi-part weldments, the engineering team will provide a quotation, typically within 24 business hours.