Direct from our specialized quartz fabrication workshops in Donghai to testing centers across Bratislava and the Danubian industrial cluster. Each component is fabricated from electronic-grade fused silica, offering thermal resistance up to 1300°C and optical clarity.
Engineered with precision ground threads for leak-tight coupling in pressurized analytical reactors and UV decomposition manifolds.
Calibrated coil geometry designed for high-efficiency heat exchange, condensation lines, and gas absorption setups in hydrocarbon labs.
Ultra-clean sample tubes engineered for Quantachrome / Micromeritics analyzers, assuring inert catalyst characterization up to 1100°C.
Dual-chamber reactor tubes for parallel pyrolytic synthesis and gas phase decomposition without devitrification under cycling temperatures.
Direct baseline for ashing dishes, calcining tanks, and slag analysis crucibles resistant to aggressive acid digestion cocktails.
Ultra-flat zero-background XRD plates optimized for crystallographic identification of automotive alloys, battery cathodes, and nanomaterials.
Heavy-wall combustion tubes engineered for muffle furnaces, elemental analyzers, and high-temperature gas-flow ashing stations.
Precision-drawn quartz light guides and stirrers providing total internal reflection and thermal stability for spectrophotometric monitoring.
Need custom dimensions, shallow forms, or specialized spout designs for your Bratislava laboratory?
Send an InquiryAnalytical quantification of inorganic residue—commonly defined as Loss on Ignition (LOI), sulfated ash testing, or gravimetric residue determination—requires sample containment vessels that remain perfectly neutral at sustained temperatures exceeding 1000°C. While traditional porcelain dishes suffer from glazed micro-porosity and alkali cation leaching, and platinum crucibles carry prohibitive capital expenditures and vulnerability to sulfur/arsenic poisoning, high-purity fused quartz (vitreous silica) represents the optimal balance of thermo-chemical resilience and analytical blank integrity.
Manufactured from natural rock crystals processed in Donghai, China, our quartz ashing dishes feature an amorphous SiO2 network with total trace metallic impurities strictly below 20 ppm. This ultra-pure chemical envelope ensures zero cross-contamination during aggressive trace-metal screenings via ICP-MS, XRF, or atomic absorption spectroscopy (AAS).
With an extraordinarily low coefficient of thermal expansion (α = 5.5 × 10-7 /K between 20°C and 1000°C), Zelvo quartz ashing dishes withstand extreme thermal shock without fracturing. Technicians in Bratislava testing laboratories can retrieve dishes directly from a 1050°C muffle furnace and transfer them directly into a room-temperature desiccator without intermediate cooling stages.
| Vessel Property | Fused Quartz (Zelvo) | Glazed Porcelain | Platinum (Pt-Rh) |
|---|---|---|---|
| SiO2 Purity | ≥ 99.99% | ~65-72% (Al-Silicate) | N/A (Metallic) |
| Max Continuous Temp | 1150 °C | 1000 °C (Glaze Softens) | 1400 °C |
| Thermal Shock (ΔT) | > 1000 °C Quench Proof | < 200 °C (Prone to Spalling) | Excellent |
| Acid Resistance | Immune to all (except HF) | Glaze degrades in acids | Attacked by Aqua Regia |
| Trace Metal Leaching | < 0.05 μg/g | High (Al, Ca, K, Na, Fe) | Extremely Low |
| Cost Index per Test | Low / Cost-Effective | Lowest (Short Lifespan) | Extreme Capital Cost |
| Element | Aluminium (Al) | Iron (Fe) | Calcium (Ca) | Magnesium (Mg) | Sodium (Na) | Potassium (K) | Lithium (Li) | Titanium (Ti) |
|---|---|---|---|---|---|---|---|---|
| Typical Content | 12.0 – 14.5 ppm | 0.2 – 0.5 ppm | 0.4 – 0.8 ppm | 0.1 – 0.3 ppm | 0.8 – 1.2 ppm | 0.6 – 1.0 ppm | 0.2 – 0.5 ppm | 1.0 – 1.3 ppm |
| Analytical Impact | Matrix Neutral | Non-Interfering | Zero Carbonate Bias | Trace Passive | Zero Alkali Fluxing | Zero Alkali Fluxing | Non-Volatile | UV Transparent |
As the automotive engine and chemical synthesis corridor of Central Europe, the Bratislava-Trnava-Nitra industrial basin relies on strict standardized analytical protocols. Our fused quartz ashing dishes are purpose-engineered to meet these exact Slovak national and European CEN/ISO regulatory requirements.
Serving Tier-1 component manufacturers and QA labs tied to the Devínska Nová Ves assembly corridors for Volkswagen, Stellantis (Trnava), and Jaguar Land Rover (Nitra).
High-throughput testing throughout the Vlèie Hrdlo refining hub, where sulfuric acid digesting, boiling cracking catalyst residues, and heavy oils demand inert thermal vessels.
Collaborating with the Slovak Academy of Sciences (Slovenská akadémia vied - SAV) and the Faculty of Chemical and Food Technology (FCHPT STU) in Bratislava.
Testing paradigms across Central Europe are undergoing a rapid technological overhaul driven by electric vehicle transition, automated sample prep, and stringent European environmental directives.
Bratislava analytical departments are progressively shifting from slow convective muffle ovens to microwave-assisted high-pressure ashing systems, requiring microwave-transparent high-purity quartz liners and evaporating dishes that endure concurrent 260°C acid vapor pressures.
With Slovakia positioning itself as an EV battery powerhouse via initiatives in Voderady and Surany, QA specialists require ultra-low sodium and lithium background quartz capsules to verify cathode stoichiometric formulations without contamination from glass matrix impurities.
Stringent trace elemental verification down to parts-per-billion (ppb) detection thresholds requires labs to eliminate porcelain crucibles entirely, as acid etching on glazed clay systematically distorts lead (Pb), cadmium (Cd), and arsenic (As) gravimetric baselines.
Bratislava procurement heads are actively bypassing multiple layers of European labware resellers in favor of direct manufacturer partnerships with verified Donghai fabricators, unlocking custom vessel geometries, 40-60% margin efficiencies, and dedicated drawing support.
Based in Donghai County, Jiangsu—the premier raw quartz mineral refining hub of Asia—Lianyungang Zelvo Quartz Products Co., Ltd. merges geographical resource purity with 10+ years of high-precision hot flame manipulation and cold CNC machining.
We do not restrict your laboratory to catalog geometries. From flat-bottom evaporating capsules, rectangular boat trays with perforated dividers, to deep cylindrical ashing cups with pouring spouts, our technicians execute to CAD sketches with dimensional tolerances of ±0.05 mm.
We support academic researchers, pilot plants, and bespoke laboratory apparatus projects across Bratislava with a true MOQ of just 1 piece. Validate vessel fit, thermal cycling, and chemical compatibility in your local muffle furnaces prior to ordering batch inventory.
Transporting fragile thin-wall and optical quartz over 8,000 kilometers demands engineered containment. Every order destined for Bratislava undergoes specialized packaging designed to eliminate mechanical vibration and transit shock.
Clear, technically verified answers addressing international trade terms, EU customs clearance, thermal maintenance, and material certifications for Slovak procurement specialists.
For urgent laboratory samples and low-volume production orders (< 50 kg), we utilize express courier services (DHL Express, FedEx Priority, or UPS) delivering directly to your facility in Bratislava (Bratislava I through V, Senec, or Malacky districts) within 4 to 7 working days from dispatch.
For consolidated pallet-scale orders, we coordinate direct Air Freight into Vienna Schwechat Airport (VIE) or Bratislava Airport (BTS) with customs clearance under DDP (Delivered Duty Paid) or DAP terms. Sea-rail freight via the China-Europe Railway Express to the Dunajská Streda intermodal hub is also supported for high-volume standard tubes and vessels, taking approximately 22–28 days.
Every manufacturing batch is tested via Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Glow Discharge Mass Spectrometry (GDMS). Upon shipment, we provide an EN 10204 Type 3.1 Inspection Certificate detailing exact elemental concentrations for aluminum, iron, calcium, magnesium, sodium, potassium, and titanium.
Third-party analytical verification reports from international inspection organizations (SGS, TÜV, or RoHS declarations) can also be attached to support institutional audits by the Slovak National Accreditation Service (SNAS).
Clear fused quartz possesses an amorphous structure. It operates continuously up to 1100°C–1150°C and intermittently up to 1300°C. However, devitrification (transformation into crystalline cristobalite, visible as surface haze or milkiness) occurs when quartz is maintained above 1150°C in the presence of surface contamination.
To maximize dish lifespan: always handle dishes with clean ceramic or nickel crucible tongs (never oily bare hands), avoid direct furnace floor contact if alkali flux is present, and clean residue with a 5–10% dilute nitric acid bath followed by deionized water rinsing before firing.
Yes. Many automated ashing analyzers (such as LECO, CEM, or PrepAsh systems) have dedicated carousels or graphite heating blocks requiring specific outer diameters, wall thicknesses, and lip bevels. You can simply provide a 2D PDF drawing, a 3D STEP/IGES CAD model, or an original damaged sample.
Our workshop maintains specialized quartz glass lathes, hydro-oxygen diamond saws, and laser profiling cutters that reproduce your vessel geometry with precise repeatability from 1 piece to 5,000 pieces.
Laboratory fused quartz items are universally classified under European Union TARIC / Harmonized System code 7017.10.00.00 (Laboratory, hygienic or pharmaceutical glassware, whether or not graduated or calibrated – of fused quartz or other fused silica). Import duty for this heading within the EU common customs territory is typically 3%.
We bill in EUR or USD and accept international wire transfer (T/T), confirmed documentary Letter of Credit (L/C) for commercial containers, and PayPal or corporate credit cards for rapid prototype dispatches. Slovak registered businesses with an active SK-VAT identification number can utilize DDP shipments to streamline import handling.
Whether you need replacement shallow ashing dishes for automotive polymer combustion, heavy-wall quartz combustion tubes for petrochemical catalyst evaluation, or a prototype BET twin tube, our sales engineers are online to evaluate your tolerances and deliver quotation pricing within 2 hours.