Explore our production capabilities spanning ultra-pure drawn tubing, precision-machined fused silica substrate plates, heavy-duty crucibles, and customized laboratory fluid systems made to custom technical drawings.
Fused quartz blocks serve as the critical physical foundation for modern high-tech industries. Understanding the thermodynamic equilibrium, hydroxyl (OH) radical kinetics, and mechanical stability of amorphous silicon dioxide is imperative for mission-critical procurement.
In high-performance industrial manufacturing, fused quartz and synthetic fused silica represent two distinct material classes governed by raw material feedstock and fusion methodology. Custom OEM fused quartz blocks produced by Kemzo are melted from naturally occurring ultra-pure pegmatitic quartz sand sourced directly from the renowned Donghai geological cluster. Through advanced high-temperature oxyhydrogen flame fusion, electric vacuum fusion, or plasma sintering, crystalline α-quartz transforms into an isotropic, non-crystalline amorphous glass block.
The resulting monolithic fused quartz block maintains an exceptionally low coefficient of thermal expansion (5.5 × 10⁻⁷/K between 20 °C and 320 °C), roughly one-thirtieth that of standard soda-lime silicate glass and one-sixth that of borosilicate glass. This gives large-dimension quartz blocks virtually zero thermal deformation under severe thermal gradients, rendering them immune to catastrophic thermal shock during semiconductor plasma etching, chemical vapor deposition (CVD), and epitaxial silicon processing.
Every monolithic quartz block leaving our Donghai annealing furnaces undergoes strict multi-stage cooling cycles to lower the structural fictitious temperature (Tf). This eliminates residual mechanical birefringence (Δn ≤ 5 nm/cm), guaranteeing that large thick blocks (up to 400 mm thickness) maintain structural integrity during aggressive 5-axis ultrasonic CNC milling and diamond core boring.
| Physical / Thermal Parameter | Standard Value | Engineering Significance |
|---|---|---|
| Chemical Composition (SiO₂) | ≥ 99.99% (Optical/Semiconductor) | Eliminates heavy metal contamination (Fe, Cu, Ni ≤ 0.2 ppm). |
| Density (ρ) | 2.20 ± 0.01 g/cm³ | Optimized mass-to-rigidity ratio for dynamic optics. |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ / K (20°C – 300°C) | Unmatched thermal shock resistance up to ΔT = 1000 °C quench. |
| Continuous Service Temperature | 1100 °C (1373 K) | Withstands prolonged high-heat diffusion furnace environments. |
| Short-Term Transformation Limit | 1450 °C (1723 K) | Peak tolerance for RTP and rapid thermal processing cycles. |
| Annealing Point (viscosity 10¹³ dPa·s) | 1215 °C | Critical thermal baseline for internal stress neutralization. |
| Softening Point (viscosity 10⁷·⁶ dPa·s) | 1683 °C | Structural deformation boundary preventing sagging under load. |
| Dielectric Constant (ε at 1 MHz) | 3.75 | Low dielectric loss tangent (< 0.0001) for RF plasma windows. |
| Refractive Index (nd at 587.6 nm) | 1.4585 | High optical uniformity with minimal chromatic dispersion. |
Converting heavy monolithic raw fused quartz ingots into intricate semiconductor chucks, photomask blanks, and high-pressure optical viewports demands deep machining expertise. Kemzo combines heavy diamond cutting with sub-nanometer surface planarization.
High-speed diamond core drilling, complex internal pocketing, vacuum channels, and blind hole tapping. Ultrasonic vibration assists conventional diamond tooling to prevent subsurface micro-fracturing and edge chipping on brittle silica blocks.
For high-energy laser viewports and semiconductor photomask substrates, our planetary chemical-mechanical polishing lines achieve laser-grade optical transmission with near-zero wavefront distortion and ultra-flat surface parallelism.
Large fused quartz blocks frequently require welded hermetic flange extensions, quartz-to-pyrex transition collars, or fusion-bonded manifold tubes. Our senior master glassblowers execute stress-free oxyhydrogen fire joining and optical fire-polishing.
As semiconductor fabrication nodes shrink past 3 nm and photovoltaic architectures transition to n-type TOPCon and Perovskite-Tandem cells, global supply chains for fused quartz blocks are undergoing monumental structural shifts.
Procurement for next-generation EUV (Extreme Ultraviolet) and High-NA DUV systems necessitates fused silica blocks with zero internal striae, sub-ppb metallic impurity levels, and near-zero OH radical counts to eliminate laser-induced optical compaction.
Over-reliance on historic Spruce Pine pegmatites has driven leading Tier-1 fab suppliers to qualify Donghai-refined ultra-pure quartz sand. Donghai's proprietary chemical leaching and plasma chlorination technologies have secured domestic supply resiliency.
Advanced 300 mm and planned 450 mm semiconductor process rings require quartz ingot fusion blocks exceeding 800 mm in diameter. B2B buyers increasingly require monolithic blocks rather than welded assemblies to avoid structural weak points under thermal cycles.
With escalating environmental standards and raw quartz sand cost volatility, European and North American buyers are demanding ESG-compliant closed-loop recycling programs for high-purity etching shields and diffusion furnace blocks.
Headquartered in Donghai County, Lianyungang—the undisputed crystal capital of China—Donghai Kemzo Quartz Products Co., Ltd. has established an integrated manufacturing ecosystem serving over 20 provinces and global tier-1 buyers since 2011.
Located in the epicenter of natural quartz mining and refining, Kemzo exercises direct oversight over raw mineral grading. This geographical integration guarantees uninterrupted access to premium crystalline silica feedstock, drastically shortening lead times and insulating buyers from global raw material price spikes.
Recognized as a Jiangsu High Technology Enterprise, our production strictly conforms to ISO 9001 quality management protocols. Every custom fused quartz block batch undergoes ICP-OES trace metal mass spectrometry, laser-interferometric flatness validation, and ultrasonic flaw testing to verify zero internal micro-bubbles.
Exporting over 70% of our annual volume to North America, Europe, South Korea, Japan, and Oceania, we have engineered dedicated fragile-freight crating solutions. Heavy quartz blocks are vacuum-sealed in multi-layer antistatic barrier film and isolated within shock-damped timber export cases supporting multimodal freight.
Real-world technical, manufacturing, and commercial answers addressing common engineering queries prior to RFQ submission and prototype milling.
Submit your 2D manufacturing drawings (PDF, DWG) or 3D CAD models (STEP, IGES). Our senior quartz ceramic engineers evaluate thermal tolerances, recommend optimal silica purity grades, and deliver a detailed commercial quote within one business hour.