Explore our premium fused quartz lineup manufactured with optical-grade double-sided polishing, extreme thermal shock resistance up to 1450°C, and verified chemical inertness for demanding applications in Central America.
A rigorous metallurgical and optical examination of synthetic fused silica versus natural fused quartz for scientific purchasers and instrument architects in Central America.
Polished quartz discs represent one of the most mechanically durable, chemically inert, and optically transparent solid-state substrates available to modern physics and industrial chemical engineering. Unlike standard borosilicate or soda-lime glass, fused quartz consists almost entirely of pure silicon dioxide (>99.99% SiO&sub2;) structured in an amorphous, non-crystalline three-dimensional tetrahedral network. This specific tetrahedral morphology completely eliminates grain boundaries, eliminating the light scattering mechanisms that plague polycrystalline ceramics.
In high-precision optical systems deployed across San Salvador—ranging from industrial spectroscopic analysers to laser optics—specifying the appropriate chemical grade is vital for preventing system failure or optical absorption attenuation. We fabricate our polished quartz discs across three recognized optical material classifications:
1. JGS1 (Synthetic Fused Silica): Synthesized via the chemical vapor deposition (CVD) of high-purity silicon tetrachloride (SiCl&sub4;) reacting in an oxygen-hydrogen flame. This material achieves absolute chemical purities exceeding 99.9999% SiO&sub2; and is completely free of metallic bubbles and inclusions. JGS1 displays exceptional transmittance from 185 nm deep-UV into the near-infrared spectrum, making it the definitive choice for excimer lasers, UV curing systems, and lithographic alignment mirrors.
2. JGS2 (Fused Natural Quartz): Melted from exceptionally high-grade natural crystal sand harvested from our native geological reserves in Donghai County. While it contains trace levels of hydroxyl groups (OH¯ ≈ 30 ppm) and metallic ions (Al, Fe, Ti < 20 ppm total), JGS2 provides superior mechanical stiffness, minimal thermal expansion, and flawless optical clarity across the ultraviolet-to-visible envelope (220 nm to 2500 nm). It serves as the workhorse for high-temperature furnace sight glasses, UV water disinfection chambers, and petroleum autoclave observation ports.
3. JGS3 (Infrared Fused Quartz): Sourced through vacuum electric fusion which drastically suppresses the hydroxyl ion content to below 5 ppm. Because the characteristic OH¯ absorption band at 2.73 μm is virtually absent in JGS3, it enables deep infrared transmission reaching up to 3500 nm, providing unmatched optical performance for pyrometric viewing windows, thermal imaging enclosures, and gas-discharge analysis in geothermal plants.
Producing optical discs capable of withstanding both thermodynamic gradients and laser damage thresholds requires exacting double-sided chemical-mechanical planarization (CMP). At Nivra Quartz, our manufacturing line applies multi-stage diamond wheel slicing, planetary double-sided lapping with progressive cerium oxide slurries, and precision edge chamfering.
Standard circular glass disc blanks often suffer from micro-fractures along edge profiles caused by mechanical stress shearing. We counter this via automated 45° protective beveling and subsequent flame annealing at 1120°C. This thermal cycle relieves internal mechanical strain birefringence to below 5 nm/cm, verified via Zygo laser interferometry and polarizing strain gauges. Whether destined for an optical mount in Antiguo Cuscatlán or an autoclave at the Ahuachapán Geothermal Field, each disc maintains extreme dimensional stability.
Empirical reference metrics for process design, optical modeling, and thermal boundary qualification.
| Physical / Chemical Property | JGS1 (Synthetic Silica) | JGS2 (Optical Fused Quartz) | JGS3 (Infrared Quartz) | Test Standard / Condition |
|---|---|---|---|---|
| Optical Transmission Range | 185 nm – 2500 nm | 220 nm – 2500 nm | 260 nm – 3500 nm | 10 mm path length, T ≥ 90% |
| Hydroxyl (OH¯) Content | ≈ 1200 ppm | ≈ 30 ppm | ≤ 5 ppm | FTIR Spectrometry at 2.73 μm |
| Total Metallic Impurities | < 0.1 ppm (Ultra-Pure) | < 15 ppm | < 20 ppm | ICP-MS Elemental Trace Analysis |
| Coefficient of Thermal Expansion | 5.5 × 10¯&sup7; / °C | 5.4 × 10¯&sup7; / °C | 5.5 × 10¯&sup7; / °C | 20°C to 320°C Dilatometry |
| Continuous Working Temp | 1100 °C | 1100 °C | 1150 °C | Atmospheric Argon / Air |
| Maximum Short-Term Peak Temp | 1350 °C | 1450 °C | 1450 °C | Softening Point: 1683°C |
| Surface Quality (Scratch-Dig) | 20/10 to 40/20 | 40/20 to 60/40 | 60/40 to 80/50 | MIL-PRF-13830B Metrology |
| Surface Flatness (λ) | λ/10 to λ/4 | λ/4 to 1λ | 1λ to 2λ | He-Ne Laser Interferometry (632.8 nm) |
| Parallelism / Wedge Angle | < 10 arcseconds | < 30 arcseconds | < 1 arcminute | Autocollimator Measurement |
Engineered to conquer the operational challenges posed by high ambient humidity, geothermal sulfur vapors, and intensive pharmaceutical sterilization protocols in El Salvador.
El Salvador is an international leader in volcanic geothermal power generation, anchored by installations across Ahuachapán, Berlín, and near the San Salvador volcanic caldera. Our polished JGS3 quartz discs serve as downhole logging sight windows, steam separator observation ports, and optical pyrometric monitors. Operating within pressurized, hydrogen sulfide-laden brine streams exceeding 280°C, our fused quartz completely resists etching and thermodynamic crazing.
The Soyapango and Antiguo Cuscatlán industrial corridors host Central America's most concentrated pharmaceutical manufacturing facilities. Our quartz petri dishes, capillary quartz tubing, and optically polished discs are critical components in High-Performance Liquid Chromatography (HPLC) UV-detection flow cells, spectroscopic purity assays, and automated sterilization autoclaves certified under rigorous DNM regulatory standards.
Sugar mills and food-processing plants across the San Salvador metropolitan periphery depend on polarimeters, refractometers, and photometric colorimeters to quantify sucrose concentrations and chemical clarities. Our precision-ground JGS2 optical discs, manufactured with parallelism tolerances below 30 arcseconds, prevent optical distortion and maintain high transmission through continuous operational cycles.
Combating tropical bacterial pathogens in potable and industrial wastewater requires robust photolytic disinfection. Our high-transmittance clear quartz spiral tubes, cylindrical sleeves, and viewing discs allow over 92% transmission of germicidal 253.7 nm UV-C radiation, preventing solarization decay or bio-film scaling under aggressive chlorination regimes.
As El Salvador expands precision metal fabrication and automotive harness manufacturing under CAFTA-DR incentives, industrial fiber laser processing equipment requires durable protective cover slides. Our custom 3mm transparent polished square and round quartz plates shield valuable optics from molten spatter, back-reflections, and thermal shock.
The Universidad de El Salvador (UES) and regional research institutes require research-grade quartzware for advanced spectroscopy, thermal gravimetric analysis (TGA), and environmental particulate assessment. We supply precision quartz crucibles, boats, test tubes, and calibrated optical flats built to custom engineering drawings.
Strategic structural developments reshaping industrial supply chains across El Salvador.
With national energy agendas mandating reduced fossil dependency, El Salvador's aggressive expansion of geothermal exploration requires high-enthalpy sensing instruments. Optical instrumentation that can operate without degrading in 300°C steam, saturated with sulfur dioxide and carbonates, is experiencing unprecedented demand, positioning synthetic and IR-grade quartz as critical infrastructure components.
Global supply chain realignment has accelerated nearshoring investments into El Salvador's Free Trade Zones (Zonas Francas). Multinational biomedical and diagnostics facilities are expanding regional assembly lines. This industrial transformation mandates cleanroom-packaged, defect-free quartz wafers, cuvettes, and custom sight glasses meeting stringent international ASTM and ISO tolerances.
Historically, Salvadoran enterprises relied on intermediary distributors in Miami or Mexico City, accumulating substantial markups and extended lead times. Forward-thinking procurement managers in San Salvador now partner directly with primary manufacturing hubs in Donghai, China, securing certified metallurgical batch traceability, custom drawing compliance, and up to 45% cost savings.
Combining world-class raw crystal deposits with state-of-the-art optical fabrication lines.
Headquartered at 285 Heping East Road, Lianyungang, Jiangsu, Donghai County Nivra Quartz Products Co., Ltd. commands a workforce of 101–200 specialized optical technicians and glassblowers. Situated directly at the global center of natural quartz extraction and processing, we maintain an unbroken supply chain—from high-purity silica sands to precision-machined, optically measured quartz components.
Every polished quartz disc shipped to San Salvador undergoes stringent QA: CNC contouring, multi-stage ultrasonic chemical de-greasing, surface interferometry verification, and Class 10,000 cleanroom vacuum packaging. We eliminate the middleman, ensuring competitive pricing and uncompromised quality.
Direct mine-to-machining control in Donghai yields raw material efficiencies unmatched by Western distributors, delivering direct savings to Latin American procurement teams.
We work directly from your CAD, PDF, DWG, or STEP drawings. From micro-capillaries to 450 mm large-diameter furnace discs, tolerances are held down to ±0.02 mm.
Fragile optical glass is individually wrapped in antistatic film, secured in high-density polyethylene shock absorption molds, and encased in export wooden crates.
Our dedicated engineering department reviews drawings and application specs with an average response time of under 5 hours, resolving inquiries without timezone delays.
Essential guidance covering logistics, customs clearance, environmental performance, and quality assurance for engineering teams in El Salvador.
For urgent prototypes, replacement optical discs, and laboratory glassware, we dispatch via Express Air Courier (DHL Express, FedEx International Priority, or UPS Worldwide) directly arriving at San Óscar Arnulfo Romero International Airport (SAL), with average customs release and delivery to San Salvador within 5 to 8 business days.
For high-volume production batches (such as bulk cylindrical tubes, furnace sleeves, or containerized quartz plates), sea freight routes depart directly from Qingdao or Shanghai Port to the Port of Acajutla on El Salvador's Pacific coastline, with typical marine transit times of 28 to 35 calendar days. We furnish comprehensive documentation including Bill of Lading, Commercial Invoice, Packing List with harmonized tariff codes (typically HS Code 7002.31 or 7017.10), and Certificates of Origin.
Unlike optical crown glasses (such as BK7 or N-BK7) which can experience surface leaching, optical fogging, and hydrolytic degradation when subjected to tropical humidity exceeding 85% RH, high-purity fused quartz is chemically inert and completely non-hygroscopic.
Furthermore, in environments near the San Salvador volcano or geothermal facilities where airborne sulfur dioxide (SO&sub2;) and hydrogen sulfide (H&sub2;S) are prevalent, fused quartz is immune to acidic atmospheric attack. It can only be dissolved by hydrofluoric acid (HF) or concentrated hot phosphoric acid (>150°C). Its surface polish and optical clarity remain uncompromised for years in tropical conditions.
Yes. Nivra Quartz operates comprehensive in-house CNC machining, high-precision core-drilling, laser ablation, and ultrasonic slotting equipment. We routinely produce customized quartz sight glasses with:
A commercial polish (often termed flame polish or basic mechanical brush finish) achieves visual transparency suitable for standard furnace sight ports, level indicators, and non-critical viewing ports. While transparent, it possesses subtle wave distortions, higher surface roughness (Ra > 2 nm), and surface flatness on the order of 2λ to 5λ.
An optical double-sided polish (CMP) utilizes planetary lapping machines with fine colloidal cerium oxide slurries, producing surface roughness down to Ra < 0.5 nm, scratch-dig tolerances of 60/40 or 40/20 under MIL-PRF-13830B standards, and transmitted wavefront distortion better than λ/4. This tier of precision is required for laser protection windows, spectroscopic analysis, and interferometry.
We maintain an agile, customer-first production structure designed to support both academic R&D and large-scale industrial operations:
To satisfy the stringent quality audits of pharmaceutical companies in Soyapango and geothermal compliance agencies, every order can be accompanied by:
1. Certificate of Analysis (COA): Validating trace chemical composition and silica purity (≥ 99.99%).
2. Dimensional Metrology Inspection Sheet: Detailing diameter, thickness, parallelism, and surface finish metrics.
3. Spectrophotometric Transmittance Curves: Confirming UV-Vis-NIR transmission metrics across specified operational wavelengths.
4. RoHS & REACH Compliance Declarations: Certifying complete freedom from hazardous heavy metals and regulated substances.
Thanks to our proprietary multi-tier shock-absorbing packaging (individual bubble encapsulation, custom polyethylene foam nests, and reinforced wooden export cases), our international breakage rate remains strictly under 0.3% across thousands of global shipments.
In the unlikely event that a component arrives fractured or chipped, our Zero-Risk Guarantee applies: simply photograph the damaged item alongside the shipping label within 72 hours of receipt, and our team will fast-track replacement fabrication and air-express replacement units to your facility in San Salvador at zero additional cost.
Whether you require standard JGS2 sight discs for geothermal observation, JGS1 synthetic optical flats for laser equipment, or custom-machined laboratory quartzware in San Salvador, our senior engineering staff is available to evaluate your technical drawings and provide rapid factory-direct quotations.