Ultra-pure thermal, optical, and structural fused silica products crafted to micron-scale geometries for semiconductor, optoelectronic, and scientific processing.
Our quartz square plates and structural blocks are synthesized with exceptional amorphous purity. Featuring an ultra-low coefficient of thermal expansion (5.5 × 10⁻⁷ / K), they withstand cyclic thermal shocks from 20°C to 1100°C without micro-fracturing or volumetric deformation.
Strategically situated in Qinghu Industrial Park, Donghai County, Jiangsu — the world's most renowned quartz manufacturing cluster — our facility exercises full vertical control from silica refinement and vacuum melting to high-precision CNC edge-grinding and fire-polishing.
Each vacuum-facing quartz vessel, square window, and furnace sleeve undergoes 100% helium mass-spectrometry leak detection (< 1 × 10⁻¹⁰ Pa·m³/s), polariscopic residual stress testing, and spectrophotometric transmission verification across UV-Vis-NIR bands.
Analyzing the thermo-mechanical and optical requirements of square fused quartz geometry across semiconductor, aerospace, optoelectronic, and industrial heating sectors.
In modern photolithography and wafer handling, dimensional stability under intense UV irradiation is paramount. Our high-precision quartz squares serve as primary substrates for chrome photomasks, vacuum chuck plates, and CMP conditioning carriers. Fabricated from synthetic fused silica with hydroxyl levels calibrated below 10 ppm, these square substrates prevent solarization, ensure transmission above 90% at 248 nm / 193 nm, and eliminate thermal wave distortions during laser patterning.
Furthermore, within dry etch and PECVD reactors, square quartz liner plates protect metallic vacuum chambers from corrosive fluoride and chloride plasma chemistries (CF₄, NF₃, Cl₂), preventing trace metallic contamination from degrading sub-10nm chip architectures.
Diffusion, oxidation, and rapid thermal processing (RTP) operations run at continuous temperatures exceeding 1100°C. Our custom square quartz baffles, heating chamber sight glasses, and rectangular muffle liners provide critical thermal insulation while maintaining transparent process observation.
Unlike standard borosilicate glasses that soften above 500°C, Southeast Quartz square plates exhibit a softening point of 1683°C and an annealing point of 1215°C. This guarantees that square quartz viewing ports remain geometrically rigid without devitrification under extreme thermal gradients or rapid cyclic cooling regimens common in compound semiconductor (GaN, SiC) epitaxial furnaces.
Industrial laser cutting, additive manufacturing (SLM/DMLS), and high-power fiber laser optics require beam delivery windows that can endure kW-level power densities. Square quartz optical plates are CNC-milled with double-sided optical polishing to surface finishes of λ/4 flatness and 20/10 scratch-dig quality.
These square shields protect expensive f-theta scanning lenses against spatter, back-reflection, and ambient airborne particulates. Because fused quartz features an absorption coefficient of virtually zero (< 10⁻⁴ cm⁻¹) across 300 nm to 2100 nm, thermal lensing is eliminated, ensuring laser spot concentricity and focal depth precision.
In bio-pharmaceutical spectrophotometry, HPLC detectors, and chemical synthesis microreactors, quartz square blocks and rectangular channels provide unparalleled chemical inertia against boiling concentrated acids (HCl, HNO₃, H₂SO₄, Aqua Regia), excluding only hydrofluoric and hot phosphoric acids.
By leveraging in-house ultrasonic CNC micro-drilling and high-temperature diffusion bonding, Southeast Quartz manufactures multi-layer microfluidic square chips without utilizing adhesive glues or organic resins. This ensures zero background fluorescence and uncompromised spectral transmission down to 190 nm deep UV.
A rigorous quantitative baseline guiding engineering material selection for harsh operating environments.
| Property Parameter | Natural Fused Quartz (Square Plates) | Synthetic Fused Silica (Optical Square) | Borosilicate Glass (Standard 3.3) |
|---|---|---|---|
| SiO₂ Purity Level | ≥ 99.99% (4N) | ≥ 99.9999% (6N) | ~ 80 - 81% (Contains B₂O₃, Na₂O, Al₂O₃) |
| Continuous Service Temp | 1100 °C | 1150 °C | 450 °C - 500 °C |
| Softening Point | 1683 °C | 1730 °C | 820 °C |
| Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / K | 5.2 × 10⁻⁷ / K | 32.5 × 10⁻⁷ / K (6x higher) |
| Deep UV Transmittance (200nm) | ~ 75% - 85% | > 90% (Excimer grade) | 0% (Opaque below 300 nm) |
| Chemical Acid Resistance | Total Inertia (Except HF, hot H₃PO₄) | Highest Inertia (Semiconductor clean) | Moderate (Alkali attack prone) |
| Typical Factory Applications | Furnace square plates, boats, tubes, rings | EUV photomasks, optical laser flats, wafer carriers | Low-temp laboratory beakers, cookware |
Why Tier-1 semiconductor and optoelectronic equipment builders rely on Southeast Quartz's integrated manufacturing ecosystem.
Donghai County is recognized as China's crystal and quartz silicon nexus. Southeast Quartz leverages direct access to superior natural rock crystal and refined granular silica feedstock, eliminating international freight volatility and securing immediate availability of plasma-melted ingots and oversized tube extrusions.
Our integrated infrastructure bridges automated hydrogen-oxygen flame glassblowing lathes with 5-axis ultrasonic CNC cold grinding machines. We cut, bore, bevel, lap, and fire-polish square dimensions from 10 mm up to 1000 mm with tight edge chip tolerances (< 0.1 mm) and face flatness under 1 stripe.
Our cross-functional engineering team evaluates customer CAD/STEP and PDF engineering drawings within 24 hours. Prototypes are manufactured within 5 to 7 working days, followed by rapid scale-up to high-volume production, drastically truncating your project's New Product Introduction (NPI) cycle.
Strategic perspectives for global procurement managers balancing geopolitical resilience, cost benchmarks, and stringent wafer-fab cleanroom requirements.
As the United States (CHIPS Act), the European Union (European Chips Act), Japan, and Southeast Asia construct new 300mm wafer fabrication hubs, demand for consumable quartz furnace components and square wafer boats has outpaced traditional localized fabrication capacity. Global supply chains face recurring delivery backlogs ranging from 26 to 52 weeks from heritage Western and Japanese fabricators.
Southeast Quartz bridges this structural supply gap by offering verified equivalent high-purity quartzware directly from China, reducing lead times to 4-8 weeks while delivering complete material traceability, Spectrographic Glow Discharge Mass Spectrometry (GDMS) testing, and significant procurement cost savings.
The global solar photovoltaic sector's aggressive migration from P-type PERC to N-type TOPCon and HJT cells necessitates higher processing temperatures and longer wafer residence times. Quartz square plates, crucibles, and diffusion tubes must withstand heavy phosphorus and boron gaseous dopants without cracking or crystallizing (devitrifying).
Our engineered low-alkali fused quartz square products offer prolonged lifespan in automated PV lines, cutting equipment downtime and preventing wafer contamination by sodium (Na), potassium (K), or iron (Fe) ions below 0.1 ppm detection limits.
Anticipating next-generation manufacturing breakthroughs in chemical vapor deposition, sub-nanometer planarization, and 3D micro-machining.
Industrialization of synthetic quartz square ingots utilizing ultra-pure SiCl₄ precursor synthesis. Target trace metallic impurities < 0.1 ppb, optimizing deep UV transmission for High-NA EUV lithography optical shields and extreme laser optics.
Deployment of advanced chemical-mechanical magnetorheological finishing (MRF) achieving square quartz face roughness Ra < 0.1 nm (< 1 Å). Eliminates laser scattering losses and provides atom-level planar interfaces for quantum photonic resonators.
Monolithic 3D selective laser etching (SLE) inside fused quartz square matrices. Facilitates true monolithic lab-on-a-chip diagnostic organs, high-pressure micro-reactors, and integrated optofluidic sensor packages without joints or adhesives.
Pioneering silicon-dioxide-matrix composite substrates designed for aerospace thermal protection and 450mm super-scale semiconductor equipment, capable of sustaining thermal gradients over 2000°C without crystalline phase transformation.
From metallurgical purity certification to Class 1,000 cleanroom vacuum packaging, our quality ecosystem adheres to global industry mandates.
Our manufacturing and cold-machining processes strictly fulfill SEMI standards for semiconductor equipment consumables, alongside full ISO 9001:2015 registration. Traceability is maintained from the raw ingot melt lot down to the finished engraved square part number.
Precision-machined quartz products undergo deionized ultrasonic washing, multi-stage acid etching to eliminate surface micro-cracks, and final drying in a certified Class 1,000 cleanroom. Sealed in double antistatic PE bags to guarantee zero particulate fallout during unboxing inside client cleanrooms.
Exporting to Europe, North America, Japan, and the Middle East, our shipments feature custom shock-absorbing foam inserts and reinforced plywood wooden cases with tilt and drop impact sensors. Full DDP (Delivered Duty Paid) air and ocean freight forwarding ensures seamless customs processing.
Comprehensive engineering insights for sourcing directors, vacuum technicians, and scientific buyers.
Explore our extensive portfolio of high-temperature laboratory consumables, optoelectronic plates, and semiconductor tooling solutions.
Upload your drawing files or project operating parameters. Our technical engineering specialists review your blueprint tolerances, thermal expansion requirements, and chemical environments to deliver a manufacturability report and factory-direct quotation within 24 hours.
Direct Engineering Contacts:
Email: [email protected] | [email protected]
Phone & WhatsApp: +86 135-8528-2520 | +86 135-8528-6180
Facility Address: No. 1 Qingsheng Rd., Qinghu Industrial Park, Donghai County, Lianyungang, Jiangsu, China 222300
