Medical Grade
Precision Manufacturing Showcase
Engineered Fused Quartz & Silica Product Range
Directly fabricated by Lianyungang Zelvo Quartz Products Co., Ltd. for demanding optical, chemical, semiconductor, and laboratory installations across Bordeaux, Talence, Pessac, and Mérignac.
Spiral Geometry
Custom U-Bent Quartz Glass Spiral Tubes
Precision Bending
Flame Welded
Heat Exchange
Technical Specs →
Reactor Core
Vacuum Process
XRD / Analysis
Circular Fused Quartz XRD Sample Holder Disc
Zero Background
Slotted Cavity
Optics Clear
Technical Specs →
Laser Optics
Diffusing Optics
Fused Quartz Frosted Glass Cylinder Ingot
Lambertian Diffuse
Sandblasted
Optics Grade
Technical Specs →
High-Temp Window
Optical-Grade Thermal Quartz Viewport Disc
Thermal Shock
Precision Bevel
Custom OD
Technical Specs →
Engineering White Paper
Material Metallurgy: High-Purity Fused Silica & Frosted Quartz Discs
An authoritative technical reference for research institutions, laser integrators, and analytic laboratories operating throughout the Nouvelle-Aquitaine region.
The Physics of Controlled Diffuse Transmission
Frosted quartz glass discs (also known in European laboratories as disques en quartz dépoli or diffuseurs en silice fondue) are critical optical components manufactured by altering the surface morphology of synthetic or natural fused quartz ($SiO_2 \ge 99.99\%$). Through precision micro-sandblasting with calibrated aluminium oxide grit ($Al_2O_3$, 120# to 1200#) or hydrofluoric acid micro-chemical etching, the specular surface is converted into a micro-rough stochastic surface topology.
This surface conversion produces controlled forward scattering (Mie and Rayleigh regimes) that breaks direct laser coherence, eliminates hotspot formation in spectrophotometric detection, and provides near-Lambertian light diffusion from deep ultraviolet (190 nm) to near-infrared (2500 nm). Unlike borosilicate glass, which degrades rapidly under ultraviolet flux and exhibits solarisation, fused quartz discs preserve stellar optical homogeneity and virtually zero thermal expansion.
"For analytical chemists and photonics engineers in the Gironde basin, selecting between mechanical sandblasting and chemical etching dictates surface roughness ($Ra$), light distribution angle (FWHM), and localized mechanical stress thresholds."
Lianyungang Zelvo Quartz Products Co., Ltd. controls the complete manufacturing vertical—from raw crystal ingot fusion in Donghai County (China's quartz heartland) to multi-axis CNC surface lapping, precision laser trepanning, and stress-relieving thermal annealing at 1150°C. This eliminates internal birefringence, yielding ultra-flat discs ($< \lambda/4$) ready for high-vacuum, cryogenic, or high-temperature processing.
CNC Lapping & Profiling Workshop
Stress-Relief Annealing Furnaces
Interferometric & Roughness QC
99.99% SiO₂ Ingot Stocks
Comprehensive Thermodynamic, Optical & Mechanical Specifications
| Physical / Chemical Property | Test Standard / Condition | Optical Grade Fused Silica (JGS1) | High Purity Fused Quartz (JGS2 / JGS3) |
|---|---|---|---|
| Purity Level (SiO₂ Fraction) | ICP-OES Spectrometry | ≥ 99.999% (Synthetic) | ≥ 99.99% (Donghai Refined Natural) |
| Surface Roughness ($Ra$) | Stylus Profilometry / ISO 4287 | Customized: $0.4\,\mu\text{m}$ to $6.3\,\mu\text{m}$ | Customized: $0.8\,\mu\text{m}$ to $8.0\,\mu\text{m}$ |
| Continuous Working Temperature | Standard Atmospheric Pressure | 1100 °C | 1100 °C |
| Peak / Short-Term Temperature | Non-deforming limit | 1300 °C | 1300 °C |
| Softening Point | Thermal Dilatometry | 1683 °C | 1680 °C |
| Thermal Expansion Coeff. ($\alpha$) | 20 °C to 320 °C | $5.5 \times 10^{-7} \ \text{K}^{-1}$ | $5.5 \times 10^{-7} \ \text{K}^{-1}$ |
| Thermal Shock Resistance ($\Delta T$) | Water Quench $1100^\circ\text{C} \to 20^\circ\text{C}$ | No cracking or structural cleavage | No cracking or structural cleavage |
| UV-Vis Spectral Diffusion Band | Total Hemispherical Transmittance | 185 nm – 2500 nm (Zero OH dip) | 220 nm – 2500 nm (Standard OH) |
| Laser Damage Threshold (LDT) | 1064 nm, 10 ns pulse, single-shot | > 12.5 J/cm² (Etched Surface) | > 8.0 J/cm² (Sandblasted Surface) |
| Hydrolytic Resistance / Acid Inertness | DIN 12111 / ISO 719 Class HGB 1 | Total Inertness (except HF & >150°C H₃PO₄) | Total Inertness (except HF & >150°C H₃PO₄) |
Local Ecosystem Integration
Industrial & Scientific Applications in Greater Bordeaux
How Zelvo Quartz frosted discs and bespoke quartzware power leading research institutes, aerospace clusters, and viticulture analytical labs across the Gironde territory.
Route des Lasers & Photonics Cluster
Bordeaux is home to the world-class ALPHA-RLH (Route des Lasers et des Hyperfréquences) competitiveness cluster and the Laser Mégajoule (LMJ) research corridor in Le Barp. Frosted quartz discs act as laser beam homogenizers, depolarizers, and optical attenuation filters that eliminate hot spots in high-energy laser diagnostic test benches.
Oenological Spectrophotometry (ISVV)
Partnered with analytical laboratories supporting Grand Cru estates and the Institut des Sciences de la Vigne et du Vin (ISVV) in Villenave-d'Ornon. Our discs serve as diffuse transmittance targets for measuring phenolic indices (Total Polyphenol Index - DO 280), tannin reactivity, wine haze, and anthocyanin colour kinetics without optical stray-reflection bias.
Aerospace & Defense Testing
Operating alongside the Aerospace Valley corridor spanning Saint-Médard-en-Jalles, Mérignac, and Le Haillan. High-temperature frosted quartz discs are integrated into thermal pyrometry viewports, environmental plasma wind tunnels, and solid-propellant exhaust analysis chambers capable of enduring instant thermal jumps up to 1300°C.
Gironde UV Photochemistry & Water Systems
Industrial effluent remediation and pesticide-degradation pilot reactors throughout the Gironde estuary demand intense UV-C (254 nm) disinfection reactors. Our JGS1 frosted discs distribute germicidal flux evenly across photochemical flow cells, preventing fungal biofilm accretion while maintaining total acid corrosion immunity.
Strategic Market Evolution
Market Trends: Quartz Procurement Dynamics in Nouvelle-Aquitaine
Key industry shifts influencing technical glass procurement, custom OEM machining tolerances, and international direct supply chains across Southwestern France.
Convergence of DeepTech Photonics & Quantum Computing
Bordeaux is solidifying its position as France's primary photonics hub through university-incubated start-ups in Talence and European high-power laser consortia. R&D labs increasingly specify non-standard frosted discs with sub-millimeter thickness ($0.5\,\text{mm} \pm 0.02\,\text{mm}$) and asymmetric one-side acid etching to act as depolarising windows in cryogenic quantum cavities.
Digitisation of Vintage Analytical Quality Control
Climate warming in the Bordeaux appellations (Saint-Émilion, Médoc, Graves) has intensified grape must sugar surges, mandating faster, continuous spectrophotometric screening of malic, lactic, and tartaric acid profiles. Traditional disposable polystyrene cuvettes are being displaced by permanent quartz flow-cells containing built-in frosted reference discs for drift-free daily calibration.
Direct Factory Sourcing vs. European Distributor Markups
French tier-1 researchers and laboratory instrument OEMs in Pessac and Libourne are circumventing regional distributors who carry 200–350% markups. By establishing direct OEM/ODM agreements with certified Chinese manufacturers in Donghai, European procurement teams capture 1-piece prototyping agility alongside volume production scaling.
Precision Engineering Cycle
Custom OEM/ODM Manufacturing Workflow
From digital STEP/CAD drawing review to delivery at your Mérignac laboratory or factory dock, our quality control maintains sub-micron repeatability.
01
Design & DFM Review
Submission of 2D/3D CAD, ISO tolerance limits, surface roughness ($Ra/Rz$), and working spectrum verification.
02
Ingot Slicing & Lapping
Diamond wire slicing from high-purity fused silica boules, followed by planetary bilateral lapping for planar parallelism.
03
Controlled Frosting
Calibrated micro-bead sandblasting or chemical HF etching to attain precise diffuse scattering angles and $Ra$ values.
04
Edge Annealing & QC
Flame beveling, ultrasonic cleanroom decontamination, surface profilometry checks, and laser spectrophotometer transmission testing.
05
DDP Bordeaux Dispatch
Custom vacuum-sealed packaging, shock-damped crating, customs documentation clearance, and express European door delivery.
Direct Factory Manufacturer
Why Bordeaux Engineers Partner With Zelvo Quartz
Located in Donghai County—the crystal and fused quartz epicenter of China—Lianyungang Zelvo Quartz Products Co., Ltd. delivers direct factory pricing with European-grade quality control.
Donghai Purity Advantage
Raw crystal refinement in Donghai ensures natural $\text{SiO}_2 \ge 99.99\%$ baseline purity with iron impurity $< 0.2\text{ ppm}$ and titanium $< 1.0\text{ ppm}$, eliminating spectral discoloration and UV absorption traps.
≤ 2-Hour Response Time
Technical engineering staff reviews your drawings and CAD models within 2 hours. Receive instantaneous DFM analysis, tolerance optimization feedback, and transparent DDP Bordeaux price quotes.
1-Piece Prototype MOQ
Support for academic research experiments at the University of Bordeaux and CNRS. We machine bespoke 1-piece pilot discs with the identical metallurgical rigor applied to 10,000-piece batch production runs.
Certified Safe Global Logistics
Multi-layered dust-free vacuum hermetic sealing, suspended foam casing, and reinforced wooden export crating guarantee 0% transit breakage to Bordeaux-Mérignac, Bassens port, or your laboratory doorstep.
Procurement Clarity
Frequently Asked Questions for Bordeaux Buyers
In-depth technical and logistical answers addressing customs, material selection, surface roughness, and delivery protocols for French procurement managers.
What is the difference between sandblasted and chemically acid-etched frosted quartz discs?
Mechanical sandblasting utilizes pressurized micro-particles of ultra-pure alumina ($Al_2O_3$) to create deeper, stochastic micro-craters ($Ra \approx 1.6\,\mu\text{m} - 6.3\,\mu\text{m}$). This produces broad, wide-angle Lambertian diffusion ideal for high-intensity infrared heating viewports, UV curing light homogenizers, and general optical diffusers. Chemically etched quartz discs are treated with controlled hydrofluoric acid baths to yield a satin, ultra-uniform micro-structure ($Ra \approx 0.4\,\mu\text{m} - 1.2\,\mu\text{m}$). Chemical etching maintains higher laser damage thresholds (LDT) by minimizing subsurface micro-fractures, making it the preferred choice for laser research laboratories in the ALPHA-RLH cluster.
Can Zelvo Quartz provide JGS1, JGS2, and JGS3 quartz material certificates for research compliance?
Yes. Every delivery batch includes a comprehensive Certificate of Analysis (CoA) documenting chemical purity, trace element impurity counts (Fe, Al, Ti, Ca, Cu, Na), and optical transmission curves. For deep ultraviolet applications (190 nm – 260 nm), we supply synthetic fused silica (JGS1 equivalent to Suprasil / Corning 7980). For standard UV-Vis oenological testing and furnace viewports, refined natural quartz (JGS2 / JGS3 equivalent to GE 124 / Herasil) provides an exceptional, cost-effective alternative.
How do your frosted quartz discs resist thermal shock during sudden heating or quenching?
Fused quartz possesses an exceptionally low coefficient of thermal expansion ($\alpha = 5.5 \times 10^{-7} \ \text{K}^{-1}$), approximately 1/20th that of soda-lime glass and 1/5th that of standard borosilicate glass 3.3. Our discs can be held at 1100°C continuously (or 1300°C intermittently) and instantly dropped into cold ambient water ($20^\circ\text{C}$) without cracking or losing mechanical integrity. This is vital for furnace inspection viewports and combustion tubes in Gironde metallurgical plants.
What dimensional tolerances can you hold for custom CNC machined circular discs?
We operate precision multi-axis CNC glass grinding centers and CO₂/picosecond laser cutting lines. Standard dimensional tolerances are $\pm 0.05\,\text{mm}$ on diameter and $\pm 0.05\,\text{mm}$ on thickness. For specialized optical disc holders or cleanroom vacuum flanges, we can achieve tolerances down to $\pm 0.02\,\text{mm}$ with edge beveling (chamfers $0.2\,\text{mm} – 0.5\,\text{mm} \times 45^\circ$) to eliminate chipping during assembly. We also support laser drilling of micro-holes, annular grooves, step edges, and custom notches according to your engineering drawings.
How do you handle shipping, EU customs clearance, and DDP delivery terms to Bordeaux?
We routinely ship orders under DDP (Delivered Duty Paid) Incoterms directly to companies and university research faculties across Bordeaux, Pessac, Talence, and Mérignac. Under DDP terms, Zelvo Quartz manages export documentation, European TARIC classification (Tariff Code 7002.31.00 / 7002.39.00), import VAT handling, and customs duties. Express shipments (DHL, FedEx, UPS) typically arrive at your laboratory within 5 to 7 business days from dispatch.
Are your frosted quartz discs fully inert to wine acids, alcohol, and cleaning chemicals?
Completely. High-purity fused silica is chemically inert to tartaric acid, malic acid, lactic acid, acetic acid, ethanol, sulfur dioxide ($\text{SO}_2$), and strong mineral acids ($\text{HNO}_3$, $\text{HCl}$, $\text{H}_2\text{SO}_4$) across standard analytical operating temperatures. It conforms to DIN 12111 (Water Resistance Class 1) and DIN 12116 (Acid Resistance Class 1). Hydrofluoric acid ($\text{HF}$) and concentrated alkaline solutions above 100°C are the only chemicals capable of etching fused quartz.
Can we order a single piece for an experimental PhD or pilot setup in Nouvelle-Aquitaine?
Yes. Unlike standard mass-producers who impose high minimum order values, our MOQ starts from 1 piece for custom drawing-based quartz parts. We actively collaborate with European research consortia, incubators, and academic labs, offering rapid prototype prototyping alongside scalable tiered discounts once your project transitions into OEM batch manufacturing.
Ready to Engineer Your Custom Frosted Quartz Discs?
Send your PDF/DWG drawings, required diameter, thickness, surface roughness ($Ra$), and operating temperatures. Our English-speaking senior optical glass engineers will review feasibility and submit an itemized DDP Bordeaux quotation within 2 hours.
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✓ Direct Factory Pricing | ✓ 1-Piece MOQ