Fused Quartz Plate Factories & Factory for the Plzeň Market

Borosilicate glass (e.g., Borofloat 33) contains roughly 81% SiO₂ along with B₂O₃, Na₂O, and Al₂O₃, giving it a maximum short-term operating temperature around 500°C and a thermal expansion coefficient of 3.3 × 10⁻⁶/K. Fused quartz plate material consists of ≥99.99% pure amorphous silica.

This purity allows fused quartz to withstand continuous thermal exposure up to 1100°C (and intermittent spikes to 1300°C) without softening. Furthermore, fused quartz has a thermal expansion coefficient of only 5.5 × 10⁻⁷/K—roughly one-sixth that of borosilicate—making it virtually immune to thermal shock cracking even when splashed with cold water at glowing red heat.

All optical plates and sight discs undergo double-sided planetary pitch polishing or chemical mechanical polishing (CMP). For commercial viewport windows, our baseline specification is 60/40 scratch-dig per MIL-PRF-13830B.

For precision laser protection windows and spectroscopic plates used in research applications at institutions like the University of West Bohemia, we achieve 40/20 or 20/10 scratch-dig with transmitted wavefront distortion of λ/4 per 100mm and surface roughness Ra < 0.5 nm, verified via Zygo laser interferometry.

Yes. For pressurized sight glasses installed on industrial boilers, autoclave tanks, and steam reaction chambers in Plzeň’s heavy machinery plants, we manufacture circular quartz discs in accordance with the dimensional, chamfer, and safety factor calculations outlined in DIN 7080.

Each batch can be delivered with EN 10204 3.1 inspection certificates documenting chemical assay (ICP-MS), hydrostatic burst pressure testing documentation, and polariscopic thermal stress evaluation.

Our CNC machining centers routinely produce outer dimensions from 5 mm × 5 mm up to 1200 mm × 1000 mm, with thicknesses ranging from 0.5 mm to 60 mm. Standard dimensional tolerances are held to ±0.1 mm, with fine CNC milling capable of ±0.02 mm.

We provide ultrasonic drilling for through-holes, blind holes, countersunk screw seats, and edge step-down rebates for o-ring elastomer vacuum sealing. All edges are CNC chamfered (0.5 mm × 45° or ground pencil edge) to prevent micro-chipping and stress concentrations.

Fused quartz is chemically inert to almost all inorganic and organic chemical compounds, including boiling concentrated sulfuric, nitric, and hydrochloric acids. It exhibits no water leaching or atmospheric hydration over extended service lifetimes.

The only known exceptions are hydrofluoric acid (HF), phosphoric acid at temperatures above 150°C, and concentrated alkaline solutions (e.g., hot NaOH or KOH at elevated temperatures), which slowly etch the silica network. For all other chemical diagnostic applications, quartz remains the supreme inert optical medium.

For custom prototype orders or small batches (1–20 pieces), production typically requires 5–10 business days following CAD drawing sign-off. High-priority air express shipping via DHL Express or FedEx takes approximately 4–6 business days direct to the customer's facility in Plzeň, Prague, or surrounding districts.

For large production batches of furnace observation plates or consumable quartz shields, consolidated air freight or sea freight to European ports (Hamburg/Rotterdam) with bonded road haulage directly into the Czech Republic is available under DDP, DAP, or CIF terms.

We implement a strict 4-tier packaging protocol engineered specifically for brittle optical glassware. Each plate is individually cleaned, wrapped with static-free optical tissue paper, and vacuum-sealed in a poly bag to eliminate surface abrasion.

Plates are subsequently nested in custom-routed, shock-absorbing high-density polyethylene (EPE) foam compartments, which are placed inside heavy double-wall corrugated cartons and enclosed within an exterior fumigated wooden crate. Our historical breakage rate over the past three years is less than 0.15%.

Yes. In addition to bare polished quartz substrates, we offer thin-film vacuum dielectric coatings. Popular coatings for Czech industrial clients include broad-band anti-reflective (BBAR) coatings covering the visible spectrum (400–700 nm, R < 0.5%), single-wavelength laser AR at 1064 nm or 532 nm, and metallic gold or aluminum high-reflection coatings for infrared laser folding mirrors.

Our minimum order quantity for custom machined quartz plates, drilled discs, and special shapes is just 1 piece. This accommodates R&D engineering trials, doctoral university research, and low-volume specialized industrial machine builds without forcing clients to purchase unwanted production volume.

We support standard international business transactions under Incoterms 2020 rules (FOB, CIF, CFR, EXW, CIP, DDP, DAP). Accepted payment currencies include EUR (Euro), USD (US Dollar), CZK (via EUR equivalent wire), and GBP.

Payment methods include Telegraphic Transfer (T/T), confirmed irrevocable Letters of Credit (L/C at sight for volume contracts), PayPal, and major credit cards for expedited prototype sample orders.