Precision Quartz Products for Spanish Buyers
Direct factory supply of optical-grade substrates, high-purity tubes, cuvettes, and custom silica components manufactured under ISO 9001 certified quality standards.
High-Purity Fused Quartz Substrates: Engineering Specifications for Iberian Industry
A comprehensive technical analysis of optical, thermal, and mechanical quartz characteristics designed to meet Spanish manufacturing and R&D standards.
Understanding Material Differentiation: Synthetic Fused Silica vs. Natural Fused Quartz
For research institutes in Madrid and semiconductor fab lines across Catalonia, selecting the precise glass grade dictates operational yield and optical efficiency. Fused Quartz is synthesized by melting ultra-pure natural crystal quartz sand (harvested from Donghai's world-renowned quartz deposit cluster). It delivers exceptional thermal stability up to 1450°C (short-term peak) and outstanding cost-to-performance efficiency for industrial furnaces, sight glasses, and UV sterilization lamps.
Conversely, Synthetic Fused Silica is produced via chemical vapor deposition (CVD) using silicon tetrachloride ($\text{SiCl}_4$). This chemical synthesis yields zero bubble content (Class 0 under DIN 58927), virtually eliminates metallic impurities (< 0.1 ppm total metals), and provides high deep-UV transmission down to 193 nm (DUV lithography wavelength). As a premier Chinese manufacturer, Donghai Kemzo Quartz Products Co., Ltd. supplies both synthetic and natural quartz substrates tailored to exact CAD drawings.
Key Material Standards & Quality Metrics
- Surface Roughness ($R_a$): < 0.5 nm (Optical Polish) to 1.5 µm (Ground Surface)
- Parallelism & Flatness: $\lambda/10$ per inch @ 632.8 nm; Total Thickness Variation (TTV) < 2 µm
- Bubble & Inclusion Rating: Compliant with ISO 12123 Class 0/1 for optical windows
- Wavelength Transmission: High UV transmittance (> 90% at 200–400 nm) & extended IR bandwidth
- Thermal Expansion: $\alpha = 5.5 \times 10^{-7} / \text{°C}$ (20°C to 300°C)
Fused Quartz Substrate Physical & Optical Properties Matrix
| Physical / Chemical Parameter | Natural Fused Quartz Grade | Synthetic Fused Silica Grade | Engineering Impact for Spanish Buyers |
|---|---|---|---|
| $\text{SiO}_2$ Purity Content | ≥ 99.99% (4N) | ≥ 99.9999% (6N) | Prevents metallic ion leaching in chemical etching & wafer doping |
| Density ($\text{g/cm}^3$) | 2.20 $\text{g/cm}^3$ | 2.201 $\text{g/cm}^3$ | Lightweight structure with extreme dimensional stability |
| Softening Point (°C) | 1683 °C | 1600 °C | Resists sagging under high-temperature vacuum processes |
| Annealing Point (°C) | 1215 °C | 1180 °C | Internal stress relief prevents thermal shock fracture |
| Coefficient of Thermal Expansion | $5.5 \times 10^{-7} / \text{°C}$ | $5.2 \times 10^{-7} / \text{°C}$ | Withstands rapid thermal quenching from 1000°C into ice water |
| Refractive Index ($n_d$ @ 589 nm) | 1.4585 | 1.4580 | Minimal dispersion for optical prisms, lenses, and viewports |
| Dielectric Strength ($\text{kV/mm}$) | 25–30 $\text{kV/mm}$ (at 20°C) | > 30 $\text{kV/mm}$ | Superior electrical insulation for high-voltage RF equipment |
| Hydroxyl ($\text{OH}^-$) Content | < 5 ppm to 30 ppm | 100 ppm to 1000 ppm (Grade Dependent) | Low OH prevents absorption bands in near-infrared spectroscopy |
Fused Quartz Applications Across Spain's Industrial Clusters
Custom-fabricated quartz glass solutions engineered to support Spain’s key technological corridors, industrial sectors, and academic research ecosystems.
Barcelona & Catalonia Photonics Hub
Collaborating with photonics spin-offs, laser laboratories, and research hubs around the ICFO (Institute of Photonic Sciences). Our precision optically-polished quartz substrates and spectrophotometer cuvettes deliver > 90% UV transmission for laser optics, flow cells, and microfluidic bio-analysis chips.
- Laser window viewports (S/D 20-10)
- Microfluidic quartz channels & wafers
- UV-Vis spectroscopy cuvettes with PTFE lids
Basque Country Advanced Manufacturing
Serving machine tool builders, metallurgy facilities, and chemical processors in Bilbao, San Sebastián, and Vitoria-Gasteiz. Kemzo supplies heavy-wall fused silica tubes, furnace diffusion chambers, and quartz rods capable of continuous operation at 1100°C without mechanical deformation.
- Heavy-wall furnace tubes & flange joints
- High-temperature melting crucibles
- Acid-resistant quartz sight glass tubes
Madrid Bio-Analytical & Aerospace
Supporting CSIC (Spanish National Research Council) laboratories and aerospace testing centers. We engineer chamfered quartz wafers for Piezoelectric QCM sensors, custom quartz slides, and high-pressure quartz sight glasses compliant with strict EU laboratory specifications.
- Single-crystal QCM sensor substrates
- High-pressure sight glass windows
- Cleanroom Class 1000 washed labware
Andalusia Solar Thermal & Green Hydrogen
Providing specialized quartz components for Concentrated Solar Power (CSP) research in Almería and high-temperature solid oxide electrolyzer cells (SOEC) for green hydrogen pilot projects across Andalusia and Valencia.
- High-flux solar receiver glass plates
- Pyrex-to-quartz fused transition joints
- Thermal-shock resistant silica tubes
Spain Market Dynamics: Microelectronics & PERTE Chip Alignment
How the surge in Spanish microelectronics investment is reshaping demand for optical-grade fused silica substrates.
Impact of the Spanish Strategic Project (PERTE Chip)
Under the Strategic Project for Economic Recovery and Transformation (PERTE Chip), Spain is injecting over €12 billion into the national semiconductor ecosystem. This initiative has triggered rapid scaling across microchip design centers, photonic integrated circuit (PIC) testing labs, and pilot fabrication plants.
As a result, Spanish engineering teams require a dependable supply of high-purity quartz substrates, photomask blank plates, and quartz boat carriers with ultra-strict dimensional tolerances. Kemzo Quartz satisfies these demands through direct manufacturer pricing and customized drawing-based fabrication.
Ensuring Regulatory Compliance for Iberian Imports
Importing technical glass into the European Union demands rigorous adherence to chemical safety, environmental directives, and customs classifications. Donghai Kemzo Quartz Products Co., Ltd. provides complete regulatory support to streamline your procurement pipeline:
- REACH & RoHS 3 Certification: Certified free of heavy metals, lead, cadmiums, and restricted SVHC chemicals.
- CE & ISO 9001 Compliance: Factory audit documentation and Certificates of Conformance (CoC) provided with every shipment.
- Customs Tariff Optimization: Accurate TARIC coding (e.g., 7002.31 for quartz tubes, 7017.10 for laboratory quartzware) ensuring smooth duty clearance.
- Vibration-Proof Export Packaging: Individually foam-molded, vacuum-sealed packaging inside reinforced plywood cases to eliminate transit breakage.
Direct-Factory Strengths of Donghai Kemzo Quartz Products Co., Ltd.
Combining source-region raw material dominance with 11+ years of international OEM export excellence.
Located in China's Crystal Capital
Our manufacturing plant is situated in Donghai County, Jiangsu Province—the core hub of China's quartz deposits. This location provides us direct access to ultra-high purity natural silica sand, reducing raw material procurement costs and assuring stable batch-to-batch quality.
Full In-House OEM / ODM Machining
We operate over 10 specialized production lines equipped with CNC glass machining centers, laser cutting units, high-precision surface lap-polishers, and hydrogen-oxygen flame welding lathes. We fabricate parts precisely according to your STEP, DWG, or PDF engineering drawings.
Rigorous Quality Inspection & Traceability
Recognized as a Jiangsu High Technology Enterprise and operating under ISO 9001 certified systems, every production batch undergoes 100% visual inspection under dark-field backlight, dimensional coordinate check, and polariscope stress birefringence testing prior to packing.
Frequently Asked Questions by Spanish Procurement & Engineering Teams
Clear answers regarding custom tolerances, delivery lead times, logistics, payment terms, and material specifications.
What is the key functional difference between fused quartz and fused silica for optical applications?
Fused quartz is produced by melting natural quartz crystal sand. It offers outstanding continuous thermal resistance (up to 1100°C) and excellent transmission in the visible and near-infrared (NIR) spectrums, making it ideal for sight glasses, furnace tubes, and standard UV lamps. Synthetic fused silica is created chemically via silicon gas vapor deposition, delivering ultra-high purity with zero bubble inclusions and superior transmission in the deep ultraviolet (DUV down to 193 nm). Synthetic fused silica is recommended for semiconductor photolithography and precision laser optics.
What dimensional tolerances can Kemzo achieve for custom-machined quartz substrates?
For custom flat quartz plates and optical wafers, our CNC and optical polishing lines achieve length/width tolerances down to ±0.05 mm, thickness tolerances down to ±0.01 mm, surface roughness $R_a < 0.5\text{ nm}$, surface quality Scratch/Dig 10-5, and flatness up to $\lambda/10$ per inch. For glass tubes, outer diameter (OD) tolerance is kept within ±0.1 mm to ±0.5 mm depending on wall thickness and tube diameter.
How are fragile quartz components protected during air or sea shipment to Spain?
With over 70% of our annual production exported globally, we have developed specialized export packaging protocols. Each quartz item is wrapped in custom-cut PE shock-absorbing foam or bubble cushioning, isolated to prevent glass-to-glass contact, and vacuum-sealed if required. Cartons are encased in heavy-duty export plywood crates reinforced with steel banding and palletized for forklift handling. We guarantee safe arrival or immediate replacement at no cost.
What Incoterms and payment terms do you offer for buyers in Madrid, Barcelona, or Valencia?
We support flexible Incoterms including FOB (Shanghai/Lianyungang), CFR, CIF, EXW, DDU, and DDP (Delivered Duty Paid), where Kemzo manages all customs clearance and import taxes directly to your facility in Spain. We accept payments via T/T wire transfer, L/C at sight, and PayPal in EUR (€), USD ($), or CNY (¥).
What is the standard production lead time for OEM drawing orders?
Standard prototype samples or small evaluation batches are typically completed within 7 to 10 working days after drawing confirmation. Volume production orders generally ship within 2 to 3 weeks. Express air freight to Spanish international airports (Madrid Barajas MAD, Barcelona El Prat BCN) takes approximately 5 to 7 days.
Can you supply material inspection certificates (CoC / COA) with our shipment?
Yes. Every order is delivered with a comprehensive Certificate of Analysis (COA) detailing chemical purity ($\text{SiO}_2$ percentage and impurity spectrum in ppm), dimensional inspection report, and polariscope stress relief verification. CE, RoHS, and REACH compliance declarations are available upon request.
Ready to Source High-Purity Fused Quartz Substrates?
Send us your engineering drawings, dimensions, or material specifications today. Our engineering team will review your requirements and provide a competitive factory-direct quote and feasibility analysis within 1 hour.