Standardized blanks, custom-dimensioned plates, precision reactor tubes, and thermal handling fixtures certified with ISO 9001 and trace-element spectroscopic inspection.
Understanding atomic structural differences, hydroxyl (OH⁻) absorption bands, refractive index homogeneity, and damage thresholds in optical-grade quartz components.
Synthesized through vapor-phase flame hydrolysis of silicon tetrachloride (SiCl₄), synthetic fused silica yields ultra-high purity (>99.9999% SiO₂) with virtually zero trace metallic impurities. It offers deep ultraviolet (DUV) transmission down to 185 nm with minimal bubble inclusion, negligible fluorescence, and exceptional resistance to excimer laser radiation.
UV Cutoff: <170 nm | OH Content: ~800–1200 ppmDerived from refined natural crystal or quartz sand, melted in an electric vacuum or oxy-hydrogen furnace. It features outstanding mechanical stiffness, thermal stability up to 1100°C continuous service, and wide spectral transmission across 260 nm to 2500 nm. Ideal for high-temperature furnace tubes, semiconductor process boats, and broad-spectrum sight glasses.
UV Cutoff: ~220 nm | OH Content: <30 ppm (Dry)Specifically treated via vacuum electro-thermal melting or plasma furnace fusion to strip away trace water molecules and hydroxyl groups (OH⁻ < 5 ppm). This eliminates the pervasive 2.73 μm fundamental OH⁻ vibrational absorption band, unlocking pristine transmission through the near-to-mid infrared band (spanning 250 nm up to 3500 nm).
IR Transmission: >90% at 2.73 μm | Low OH| Physical / Optical Parameter | Synthetic Fused Silica (JGS1) | Natural Fused Quartz (JGS2) | Infrared Grade Quartz (JGS3) | Test Standard |
|---|---|---|---|---|
| Refractive Index ($n_d$ @ 587.6 nm) | 1.4585 | 1.4584 | 1.4584 | Abbe Refractometry |
| Coefficient of Thermal Expansion (CTE) | $5.5 \times 10^{-7} / \text{K}$ (0–300°C) | $5.5 \times 10^{-7} / \text{K}$ | $5.4 \times 10^{-7} / \text{K}$ | Dilatometry (DIN 51045) |
| Softening Point / Annealing Point | 1585°C / 1120°C | 1683°C / 1215°C | 1710°C / 1220°C | Beam Bending (ASTM C598) |
| Laser Induced Damage Threshold (LIDT) | >15 J/cm² (1064nm, 10ns) | >7.5 J/cm² (1064nm, 10ns) | >12 J/cm² (1064nm, 10ns) | ISO 21254-1/2 |
| Surface Roughness ($R_a$) Post-Superpolish | < 0.3 nm (3 Ångström) | < 0.5 nm | < 0.4 nm | Zygo NewView WLI |
From sub-nanometer lithographic wavefront management to high-temperature corrosive vapor handling in gigawatt photovoltaic and semiconductor cleanrooms.
In advanced wafer processing (sub-7nm nodes), fused silica represents the absolute benchmark for photomask substrates, exposure optics, and wafer stage chucks. Its near-zero thermal expansion coefficient prevents pattern distortion under continuous deep-UV excimer laser exposure (ArF 193 nm immersion and KrF 248 nm). Simultaneously, within diffusion, LPCVD, and atomic layer deposition (ALD) chambers, our oversized quartz tubes, slotted wafer boats, and 3-port bubblers withstand relentless thermal cycling up to 1200°C without introducing toxic metallic contamination (Fe, Cu, Na < 0.1 ppm).
The transition to N-type TOPCon, Heterojunction (HJT), and tandem Perovskite-Silicon architectures requires ultra-pure thermal containment. Low-grade quartz leads to micro-crack propagation and wafer cross-contamination. Our high-purity quartz furnace tubes (diameters exceeding 450 mm) deliver exceptional dimensional circularity (ovality < 1.2 mm), ensuring tight vacuum seals during phosphorus oxychloride (POCl₃) diffusion and boron tribromide (BBr₃) doping at continuous temperatures above 1050°C.
Multi-kilowatt material processing (1 kW to 30 kW continuous wave lasers) demands protective windows, collimating lenses, and beam splitters with exceptionally low bulk absorption (<3 ppm/cm at 1064 nm). Fused silica optics manufactured via tight synthetic soot boule control eliminate thermal lensing effects—where localized heating alters focal positions—thereby maintaining precise laser beam focus during high-speed metal cutting, additive manufacturing, and automated robotic welding.
High-throughput DNA sequencing, flow cytometry, and capillary electrophoresis rely heavily on precision quartz microchannel flow cells. Quartz ensures zero background auto-fluorescence under UV laser excitation (355 nm and 405 nm), enabling single-molecule detection sensitivity. Our laser-micromachined and optically bonded channels exhibit sub-micron channel tolerances, perfect optical parallelism, and extreme chemical resistance to aggressive organic solvents and enzymatic lysing agents.
How the Donghai quartz cluster integrates raw ingot purification, automated 5-axis CNC cold machining, and cleanroom metrology to solve global supply bottlenecks.
Located in Donghai County, Jiangsu—the premier raw quartz distribution and processing hub in Asia—our facility commands immediate, localized access to high-purity natural silica reserves and plasma-fused raw ingots. This proximity eliminates supply chain volatility, reduces raw stock procurement lead times by up to 60%, and ensures absolute batch-to-batch chemical homogeneity.
Our Industry 4.0 workshop pairs high-precision automated glass lathes with multi-axis CNC diamond grinding and ultrasonic ultrasonic milling stations. Complex geometrics—including slotted wafer combs, wafer carriers, spiral heating elements, and hermetic flanged chambers—are manufactured with tolerances held within $\pm 0.02$ mm, followed by localized hydrogen-oxygen fire polishing.
Every single component destined for semiconductor or optical applications undergoes ultrasonic multi-stage HF/nitric acid pickling, followed by 18.2 MΩ·cm deionized water cascade rinsing. Testing protocols include vacuum helium mass spectrometry leak detection (leak rates < $1 \times 10^{-9}$ mbar·L/s) and Zygo Phase-Shifting Interferometry before cleanroom vacuum packaging.
Enterprise procurement of optical quartzware requires moving past initial unit costs to evaluate thermal survivability, dimensional consistency, yield preservation, and global supply logistics.
We review and manufacture directly against customer STEP, DWG, and PDF technical prints under ISO 10110 optical standards and MIL-PRF-13830B surface quality benchmarks. Clear callouts for clear aperture (CA), scratch-dig ratings (e.g., 20-10 or 10-5 for laser grade), and wavefront distortion ($\lambda/10$ @ 632.8 nm) ensure friction-free incoming inspection at your destination dock.
Poorly annealed quartz products exhibit residual internal stresses that cause violent fractures during thermal ramps in process furnaces. We employ computer-controlled thermal annealing cycles (soaking at 1150°C followed by controlled cooling under 1.5°C/min) to drive optical retardation below 5 nm/cm, extending service lifetimes in 24/7 wafer fab environments.
Fragile optical and oversized quartz furnace components are shielded using multi-layer suspension packaging, anti-static moisture-barrier bags, nitrogen flushing, and custom heavy-duty shock-absorbing crating. Vibration data-loggers are deployed on intercontinental sea and air freight consignments to guarantee zero transit damage.
Pioneering next-generation quartz fabrication: accommodating ultra-fast femtosecond lasers, extreme ultraviolet (EUV) photolithography, and integrated quantum optical circuits.
As the semiconductor roadmap progresses toward 2nm and beyond with High-NA (0.55) EUV lithography systems, thermal dissipation and zero-expansion stability become non-negotiable. Southeast Quartz R&D is refining ultra-low expansion glass (ULE) and titanium-doped fused silica substrates to support deterministic magnetorheological finishing (MRF) with surface roughness $R_q < 0.1$ nm.
Modern material micro-processing requires optical components that withstand petawatt-level peak laser intensities without nonlinear self-focusing, multi-photon absorption, or laser-induced color center formation. Our advanced fluorine-doped synthetic fused silica compositions demonstrate a superior damage threshold (LIDT > 25 J/cm² @ 1030 nm, 300 fs pulses).
We are partnering with tier-one research institutes to provide monolithic fused quartz blanks tailored for direct femtosecond laser writing (FLW). This manufacturing technique enables three-dimensional optical waveguide networks, single-photon quantum routing circuits, and monolithic optofluidic chips with zero insertion loss and structural phase stability.
Rigorous qualification pipelines meeting North American and European regulatory frameworks, backed by traceable laboratory spectrometry.
Our production processes adhere strictly to ISO 9001:2015 quality management systems. All delivered quartz and fused silica components comply fully with EU RoHS (Directive 2011/65/EU) and REACH (EC 1907/2006) regulations, ensuring zero hazardous or SVHC (Substances of Very High Concern) content across all supply channels.
Every batch of raw ingot and finished furnace tube is accompanied by full chemical analysis reports. We utilize Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Glow Discharge Mass Spectrometry (GDMS) to certify that key alkali (Li, Na, K) and transition metals (Fe, Ti, Cr, Ni) remain below stringent sub-ppm industry thresholds.
Our international sales and engineering team operates seamlessly across North American, European, and Asia-Pacific time zones. From providing rapid Design for Manufacturability (DFM) feedback on custom CAD prints within 24 hours to establishing local consignment inventory buffer stocks, we ensure total operational continuity.
Explore oversized process chambers, horizontal and vertical diffusion carriers, and bespoke CNC-machined quartzware engineered for extreme duty cycles.
Addressing crucial engineering, manufacturing, and procurement inquiries from global process engineers and supply managers.
While both materials consist of amorphous silicon dioxide ($SiO_2$), fused quartz is produced by melting natural crystalline quartz minerals, typically resulting in minor metallic impurities (10–30 ppm) but providing superior structural rigidity and temperature resistance up to 1200°C. Fused silica is synthetic, synthesized from chemical precursors like $SiCl_4$, producing an ultra-pure glass (>99.9999%) that is virtually free of metals and bubbles, offering peak deep-UV transmission (185–260 nm) and superior laser damage thresholds.
Devitrification typically occurs above 1100°C when surface alkali contaminants (such as sodium, potassium, or calcium from improper handling or airborne dust) act as nucleating agents, turning transparent amorphous glass into opaque cristobalite. We prevent this by conducting multi-stage hydrofluoric acid surface etching, hot deionized cascade washing, cleanroom thermal stress annealing, and vacuum-sealed cleanroom packaging to eliminate all surface residues prior to deployment.
We accept CAD models in STEP, IGES, DXF, and DWG formats, alongside 2D PDF prints with explicit tolerances. For optimal evaluation, please specify: exact dimensions (outer diameter, inner diameter, wall thickness, overall length), required surface quality (Scratch-Dig per MIL-PRF-13830B or ISO 10110), clear aperture requirements, operational atmosphere (vacuum, inert, halogen, or oxidizing gas), peak working temperature, and target production volume.
All sealed reactors, custom quartz bell jars, flanged diffusion tubes, and 3-port bubblers undergo helium mass-spectrometry leak detection according to ASTM E498/E499 standards. The test chamber is evacuated to vacuum, and high-purity helium is sprayed along all fire-welded seams. We verify a leak threshold tighter than $1 \times 10^{-9} \text{ mbar}\cdot\text{L/s}$, guaranteeing absolute hermetic integrity under ultra-high vacuum (UHV) conditions.
Because Southeast Quartz maintains extensive localized inventories of high-purity ingots, cylindrical boules, and standard tubing stock in Donghai, standard prototyping lead times average 7 to 14 business days from drawing freeze. Volume batch manufacturing runs typically ship within 3 to 5 weeks, depending on CNC machining complexity, acid purification requirements, and designated batch metrology testing.
Yes. Utilizing continuous electrical fusion pulling towers and horizontal oxy-hydrogen lathe reforming systems, our workshop regularly manufactures oversized fused quartz tubes with outside diameters ranging up to 600 mm, lengths exceeding 3500 mm, and customized wall thicknesses ranging from 3.0 mm up to 12.0 mm, maintaining strict wall thickness concentricity tolerances (<8%).
