Optical Grade
Precision Component Catalog
High-Performance Fused Quartz Discs & Laboratory Substrates
Manufactured from 99.99% to 99.999% SiO2 raw materials with superior thermal shock resistance, extreme UV-to-infrared optical transmission, and precision CNC laser profiling.
UV Reactor
Thermal Epitaxy
Clean Furnace
CVD Vacuum
Surface Metrology
Ultra Pressure
Test Sample Disk
Kyoto Regional Integration
Precision Applications across Kyoto's Advanced Research & Industrial Corridor
From Keihanna Science City (Kansai Science City) to the academic labs of Kyoto University and industrial clusters in Minami-ku and Fushimi-ku, our fused quartz discs address stringent mechanical, optical, and thermal boundaries.
Semiconductor & Power Device Lithography
Kyoto’s specialized semiconductor ecosystem—spearheaded by power electronics pioneers focusing on Silicon Carbide (SiC) and Gallium Nitride (GaN)—requires substrate carriers and stepper viewports with minimal thermal expansion.
- Negligible thermal expansion (CTE: 5.5 × 10-7 /°C) preventing thermal misalignments.
- Zero heavy-metal ionic migration (Na, K, Fe < 0.1 ppm) to prevent epitaxial lattice contamination.
- Extreme resistance to fluorinated plasma etch gases (CF4, CHF3, SF6).
UV & FTIR Analytical Spectrometry
Home to global precision analytical leaders such as Horiba and Shimadzu, the Kyoto area leads in molecular characterization instruments where baseline optical transmission can make or break detection thresholds.
- Synthetic JGS1 fused silica discs offering >90% transmission down to 185 nm deep-UV.
- Low-OH synthetic grades ensuring flat infrared transmission profiles free of 2.73 µm water peaks.
- Super-polished optical surfaces reaching Scratch-Dig 20/10 and Ra < 0.5 nm.
High-Temperature CVD & RTP Vacuum Chambers
Leading academic divisions at Kyoto University’s Katsura Campus deploy our quartz discs as thermal insulation shields and chamber viewports during chemical vapor deposition and rapid thermal processing.
- Continuous operating stability up to 1100°C, with peak excursion capacity to 1300°C.
- High softening point of 1683°C, preventing structural sagging under high-vacuum differential pressures.
- Exceptional thermal shock resistance (capable of water-quenching from 1000°C without micro-cracking).
Photonics & Ultrafast Laser Optics
Researchers within Keihanna Science City developing picosecond and femtosecond fiber lasers utilize our fused quartz optical discs as low-dispersion mirror substrates, beam splitters, and output coupler windows.
- High Laser-Induced Damage Threshold (LIDT > 10 J/cm2 at 1064 nm, 10 ns pulses).
- Negligible internal stress birefringence (< 5 nm/cm optical retardation across the clear aperture).
- Minimal wavefront distortion with surface flatness measured at λ/4 to λ/10 per inch.
Bio-MEMS & Microfluidic Devices
The biomedical engineering clusters at Kyoto Research Park (KRP) rely on high-purity quartz discs for fluorescence detection cells, gene sequencing microplates, and microfluidic reaction chips.
- Extremely low intrinsic autofluorescence under UV laser excitation (266 nm, 355 nm).
- Hydrophobic/hydrophilic surface modification stability after oxygen plasma cleaning.
- Precision laser micro-drilling of inlet/outlet ports down to ø0.15 mm without micro-fractures.
Electronic Packaging & Ceramic Sintering
In proximity to global electronics components and ceramic capacitor powerhouses based in Kyoto and Shiga, our quartz discs serve as inert kiln furniture, wafer setter plates, and sintering separators.
- Zero chemical reactivity with titanates, zirconates, and noble metal metallization pastes.
- High mechanical compressive strength (> 1100 MPa) under sustained thermal loading.
- Available in frosted, bead-blasted, or flame-polished finishes to match thermal dissipation targets.
Kansai Market Intelligence
Macro Development Trends Shaping Quartz Procurement in Kyoto
An authoritative analysis of technical shifts, regulatory drivers, and domestic semiconductor manufacturing initiatives influencing material supply chains across Japan's Kansai economic sphere.
Reshoring Semiconductor Fabrication
Driven by METI’s (Ministry of Economy, Trade and Industry) national semiconductor strategy, Japan’s chipmakers and Tier-1 tool fabricators are upgrading domestic wafer processing pipelines. Kyoto’s specialized niche in power modules and compound semiconductors has accelerated the migration from standard borosilicate glass to high-purity fused quartz discs capable of enduring high-density plasma deposition and atomic layer etching (ALE).
Stringency in Trace Contamination
As Kyoto’s quantum computing research laboratories and extreme-UV (EUV) optical projects push sub-nanometer fabrication boundaries, the tolerance for trace metal contamination has shrunk from parts-per-million (ppm) to parts-per-billion (ppb). Procurement protocols in Kyoto now demand documented Inductively Coupled Plasma Mass Spectrometry (ICP-MS) elemental analyses for every batch of raw SiO2 fused quartz discs.
Decarbonization & Thermal Efficiency
In accordance with the Kyoto Protocol’s historical legacy and the Japanese government’s 2050 Carbon Neutrality Mandate, manufacturing hubs in Kansai prioritize extended component lifecycles. Traditional furnace viewing windows degrade rapidly under aggressive thermal cycling; by selecting high-purity natural and synthetic quartz discs with near-zero devitrification rates, fabs reduce maintenance shutdowns and electrical consumption.
Material Science Benchmark
Fused Quartz vs. Synthetic Fused Silica: Grade Selection Matrix
Engineered for precision procurement officers and optical engineers in Kyoto comparing JGS1, JGS2, and JGS3 structural and physical characteristics.
| Physical / Optical Parameter | JGS1 (Synthetic Fused Silica) | JGS2 (Optical Grade Fused Quartz) | JGS3 (Infrared Fused Silica) | Testing Protocol |
|---|---|---|---|---|
| Primary Raw Material | Synthetic SiCl4 Chemical Synthesis | Natural High-Purity Quartz Crystal | Electrically Fused Natural Quartz | Spectrochemical Assay |
| SiO2 Purity Content | ≥ 99.9999% (< 0.1 ppm impurities) | ≥ 99.995% | ≥ 99.99% | GD-MS / ICP-MS |
| Spectral Transmission Range | 185 nm – 2500 nm (Deep UV to Vis) | 220 nm – 2500 nm (UV to Near-IR) | 260 nm – 3500 nm (Extended IR) | UV-VIS-NIR Spectrophotometer |
| Hydroxyl (OH-) Content | High (800 – 1200 ppm) | Medium (100 – 200 ppm) | Low (< 5 ppm, Water-Free) | FTIR Absorption @ 2.73 µm |
| Coefficient of Thermal Expansion | 5.5 × 10-7 /°C (0 – 300°C) | 5.5 × 10-7 /°C (0 – 300°C) | 5.4 × 10-7 /°C (0 – 300°C) | Dilatometry (JIS R3102) |
| Max Continuous Temperature | 1050°C | 1100°C | 1150°C | Static Heat Test |
| Laser Damage Threshold (LIDT) | > 12 J/cm2 (1064 nm, 10 ns) | > 6 J/cm2 (1064 nm, 10 ns) | > 5 J/cm2 (1064 nm, 10 ns) | ISO 21254 Pulse Irradiation |
| Target Kyoto Application | Excimer optics, UV steppers, bio-fluorescence | Observation ports, furnace sight glasses | CO2 laser optics, IR pyrometry | System Integration |
Manufacturing Capabilities
Why Japan’s High-Tech Enterprises Rely on Zelvo Quartz
Combining world-class raw crystal deposits from Donghai County with high-precision CNC laser trepanning, optical flat polishing, and dedicated Japanese export handling.
10+
Years Engineering Expertise
≤ 2h
Inquiry & Drawing Review
37%
Client Reorder Rate
4.9 / 5
Verified Quality Rating
Drawing-Based Custom CNC Machining
Equipped with ultrasonic milling, CNC 5-axis profile machining, precision laser trepanning, and diamond wire sawing. We manufacture custom circular discs, stepped flanges, bevel-edged sight glasses, and micro-holed plates holding tolerances to ±0.02 mm.
Verified Raw Purity from Donghai Hub
Situated in China’s Silicon and Quartz Capital (Donghai County, Jiangsu), we have unhindered access to the world’s purest natural quartz crystals. Every furnace heat is tested for trace bubble count, devitrification velocity, and residual metal elements before batch release.
Agile MOQ (From 1 Piece Prototype)
We respect the iterative nature of academic research at Kyoto University and R&D prototyping across Kansai corporate laboratories. We offer zero MOQ hurdles on custom quartz discs—enabling rapid 1-piece sample verification before transitioning into batch volume runs.
Streamlined Logistics to Kansai (KIX / Osaka)
Direct export protocols tailored for Japan. Multi-layered cleanroom anti-static vacuum wrapping, shock-absorbing custom foam inserts, and certified reinforced plywood crates ensure zero chipping during expedited airfreight to Kansai International Airport (KIX).
Procurement Knowledge Base
Frequently Asked Questions by Kyoto & Japanese Engineers
Technical clarifications addressing Japanese Industrial Standards (JIS), dimensional tolerances, surface quality, thermal hysteresis, and customs clearance procedures.
How do your fused quartz discs comply with Japanese Industrial Standards (JIS)?
Our quartz disc fabrication adheres to the dimensional, mechanical, and optical verification procedures defined under JIS R3200 (Flat Glass Testing) and JIS R1601 (Fine Ceramics Testing). Purity certification conforms to strict SEMI and JIS standards for high-temperature semiconductor processing materials.
What surface roughness (Ra) and flatness (λ) can you guarantee for optical discs?
Depending on application requirements, we provide double-sided optical polishing delivering surface roughness Ra ≤ 0.5 nm (5 Å), with Scratch-Dig ratings of 40/20 or 20/10 (MIL-PRF-13830B). Surface transmitted wavefront flatness can be certified between λ/4 and λ/10 @ 632.8 nm using Zygo laser interferometry.
Can you provide inspection certificates (Mill Sheets / CoA) with elemental trace analysis?
Yes. Every batch dispatched to Kyoto can include an official Certificate of Analysis (CoA) specifying ICP-MS metallic trace element measurements (Fe, Al, Ca, Mg, Ti, Cu, Na, K, Li < 20 ppm cumulative for JGS2, < 0.1 ppm for JGS1), UV-VIS-NIR spectral transmission graphs, and coordinate measuring machine (CMM) dimensional reports.
What is the typical shipping lead time to Kyoto, and what Incoterms do you support?
Custom prototype discs generally ship within 5 to 10 working days after 2D/3D CAD sign-off. Via express air courier (DHL, FedEx, SF Express) to Kansai International Airport (KIX), transit time to Kyoto is 2 to 4 days. We support FOB, CFR, CIF, DDP, and DAP terms, handling customs formalities with full RoHS 3 and REACH compliance declarations.
Can you machine complex features like steps, counterbored holes, and frosted rings?
Yes. Our precision processing facility routinely fabricates stepped circular viewports, laser-trepanned counterbored holes for thermocouple feedthroughs, precision alignment notches, optical fiducial markers, and masked selective edge frosting for diffuse backlighting or seal adhesion.
How do you safeguard fragile thin quartz discs from chipping during ocean or air transit?
We implement a strict 4-stage optical packaging standard: individual lint-free optical lens paper wrapping, secondary cleanroom anti-static PET vacuum sealing, high-density polyethylene (EPE) die-cut shock cushioning, and an exterior shock-isolated wood or heavy export carton barrier rated for drops and vibration.
Accelerate Your Project with Custom Quartz Discs
Whether you require a single high-purity prototype window for a Kyoto University laboratory trial or high-volume wafer substrates for next-generation semiconductor equipment fabrication, our engineering team provides technical feasibility and quotations within 2 hours.