One Material. Every Critical Industry.

Why leading fabs choose FGQuartz semiconductor quartz:

• Extreme thermal stability and near-zero CTE for repeated furnace cycles
• Ultra-high purity SiO₂ to prevent metallic contamination
• Superior chemical resistance to acids and process gases
• CNC-machined dimensional precision for 100-300mm wafers
• Clear and opaque grades optimized for pyrometry and thermal insulation

Applications cover diffusion furnaces, LPCVD/PECVD, annealing, wet cleaning, and epitaxial growth. Whether you need standard replacement parts or custom CNC quartz components, our 20+ years of semiconductor expertise ensures higher yield and longer service life.

Key advantages:

• Broad transmission from 150 nm (deep UV) to >3 µm
• Low thermal expansion for distortion-free performance
• Precision polishing for windows, lenses, prisms, and etalons
• High homogeneity and low birefringence

Ideal for excimer lasers, Nd:YAG systems, UV lithography, spectroscopy (cuvettes, flow cells), astronomy mirror blanks, and UV lamp envelopes. From prototype to volume production, we provide AR/HR coated custom optical quartz components.

Essential for:

• Trace element analysis (ICP-OES/MS) with minimal blanks
• High-temperature ashing, fusion, and calcination (up to 1200°C)
• Acid distillation, sub-boiling stills, and photochemical reactors
• ICP plasma torch assemblies and custom vessels

Products include crucibles, combustion boats, reaction tubes, beakers, distillation apparatus, and fully custom designs. Perfect for geochemistry, pharmaceuticals, environmental testing, and materials research.

Core offerings:

• MCVD substrate tubes with tight wall uniformity
• VAD/OVD reaction tubes, mandrels, and starting rods
• Overclad & fluorine-doped cladding tubes
• Sintering furnace liners and lathe chuck fittings

Low-OH and specialty grades support single-mode, PM, LMA, and photonic crystal fibers. Our components help manufacturers achieve consistent low attenuation and high yield.

Key PV applications:

• CZ and Directional Solidification (G5-G8) crucibles
• Phosphorus diffusion tubes and high-throughput wafer boats (M10/G12)
• PECVD/LPCVD tubes, bell jars, and liners
• Wet process tanks and handling tools

Optimized for monocrystalline, multicrystalline, PERC, TOPCon, and next-gen architectures. Reduce oxygen variation and contamination while maximizing uptime.

Why industrial manufacturers choose FGQuartz high-temperature quartz:

• Exceptional thermal shock resistance with near-zero CTE for rapid heating and cooling cycles
• Continuous service temperature up to 1200°C (short-term to 1300°C)
• Outstanding chemical inertness to most process gases, acids, and combustion environments
• Clear grade for high infrared transmission and opaque grade for thermal insulation/shielding
• Precision fabrication (CNC + oxy-hydrogen flame forming) for both standard and custom geometries

Applications cover infrared heating & curing ovens, industrial tube and muffle furnaces, chemical reactors, metal heat treatment, glass & ceramics processing, combustion systems, emissions monitoring, and plasma equipment. Whether you need standard replacement parts or fully custom high-temperature quartz components, our 20+ years of specialist expertise ensures longer service life and reliable performance in the harshest thermal environments.

Founded in 2005 in Lianyungang, Jiangsu Province, FGQuartz has spent two decades manufacturing exclusively from fused silica and high-purity quartz glass — building the accumulated process knowledge that allows the engineering team to advise on material selection, not just supply a catalogue part.

Semiconductor, optical, laboratory, fiber optic, solar photovoltaic, and high-temperature industrial — FGQuartz’s production facility and engineering team cover all six major application categories of high-purity quartz glass under one roof at Lianyungang.

FGQuartz products are sold worldwide. Exported directly through the Port of Lianyungang, they can be shipped by sea to most destinations around the globe; air freight services are available to meet urgent order requirements, with shipments typically arriving in major industrial markets within 3 to 15 business days.

No minimum order is imposed on custom components. Research groups evaluating a new process design, OEM engineers qualifying a component for a new instrument, and production buyers trialling a new supplier can all order prototype quantities of a single piece without surcharges or extended lead times.

It may seem surprising that the same fused silica material appears in a semiconductor diffusion furnace, a UV spectrophotometer, an optical fiber preform lathe, and an automotive paint-curing oven. The connection is the unique combination of properties that fused silica offers: no other affordable material simultaneously provides extreme thermal stability, near-zero thermal expansion, UV-to-infrared transparency, chemical inertness, and electrical insulation at high temperatures. Different industries exploit different subsets of these properties — semiconductor manufacturing primarily needs purity and thermal stability; optical applications need UV transparency and low birefringence; industrial heating needs thermal stability and infrared transparency — but the underlying material is the same across all of them.

Not all quartz glass applications require the same level of purity, and selecting a higher grade than necessary adds cost without benefit. Optical applications requiring deep-UV transmission — excimer laser optics, UV spectroscopy, germicidal UV lamps — need synthetic high-OH (JGS1) fused silica because only this grade transmits efficiently below 250 nm. Semiconductor and solar applications require high-purity natural fused silica (JGS2 equivalent) for low metallic contamination without the OH-related near-infrared absorption that would be irrelevant in these applications. Industrial heating applications can often use commercial-grade quartz where the purity requirements are less stringent. FGQuartz stocks and manufactures across all these grades and advises customers on the appropriate selection for each application.

Clear fused silica and opaque quartz are variants of the same base material — silicon dioxide — but opaque quartz is processed to contain microscopic voids that scatter infrared radiation rather than transmitting it. This gives opaque quartz very different thermal behaviour: low emissivity, thermal insulation, and opacity to infrared. In semiconductor manufacturing, clear process tubes allow pyrometric temperature sensing; opaque furnace liners provide thermal insulation. In industrial heating, clear heater envelopes transmit infrared from the element to the workpiece; opaque reflector shields direct that infrared in the desired direction. In laboratory furnaces, clear tubes allow visual inspection of the sample; opaque liners reduce heat loss from the furnace body. The choice between grades is not a quality decision — it is a functional specification decision that depends on whether you need the glass to transmit or block infrared.

Whether a quartz component is a semiconductor diffusion tube, a solar furnace liner, a laboratory muffle insert, or an industrial infrared heater envelope, all high-temperature quartz glass components share the same primary failure mechanism: devitrification. This is the crystallisation of the amorphous fused silica surface into cristobalite, occurring above approximately 1050°C, accelerated dramatically by alkali metal contamination from the process environment or from handling without gloves. Devitrified quartz is structurally weaker, generates particles, and indicates that the component should be replaced. Managing devitrification risk through operating temperature choice, surface cleanliness practices, and timely replacement is the most important maintenance consideration that spans all high-temperature quartz applications regardless of industry.

The assumption that Chinese-manufactured quartz glass components are necessarily lower quality than those from Japanese or European suppliers reflects historical market conditions that no longer apply to specialist manufacturers like FGQuartz. The raw material — high-purity quartz sand and synthetic silica precursors — is an internationally traded commodity available at the same specification globally. The manufacturing processes — arc fusion, CNC grinding, oxy-hydrogen flame forming — use equipment and techniques that are fully transferable regardless of geography. The purity verification tools — ICP-MS analysis — are standard laboratory instruments. What differentiates quality is the process knowledge, quality discipline, and testing rigour of the individual manufacturer, not the country in which they operate. FGQuartz competes on these factors, not on a price-for-quality trade-off.

Standard catalogue quartz components — tubes in common diameters, crucibles in standard volumes, cuvettes in standard path lengths — exist because the most common applications converge on a small set of frequently used dimensions. For these applications, catalogue items are faster, cheaper, and lower-risk than custom fabrication. Custom components are appropriate when: the required dimensions fall outside the standard range; the component has geometric features (ports, flanges, specific end configurations, complex curvature) that cannot be achieved with standard tube and rod stock; or when the application is a novel design where no standard exists yet. FGQuartz produces both standard and custom items from the same facility, with no surcharge on custom orders beyond the additional fabrication time required.