Our glassblowing technicians and metrology engineers operate under strict ISO-grade quality protocols in Donghai County, China's premier fused silica hub.
Every batch of raw crystal feed undergoes glow discharge mass spectrometry (GDMS) tracking. Metal impurities (Fe, Al, Ti, Ca) are kept below trace thresholds to avoid catalytic contamination in sensitive analytical reactions.
With an extremely low linear expansion coefficient of 5.5 × 10⁻⁷ /K, Zelvo quartz labware withstands rapid quenching from 1100°C into ice water without fracture, and remains immune to hot sulfuric, nitric, and hydrochloric acids.
All blown items (triple-neck flasks, spiral jackets, cuvette joints) undergo digital annealing furnace cycles up to 1215°C to eliminate residual thermal stress, verified via polariscope examination before crating.
| Physical / Optical Property | Fused Quartz Laboratory Grade | Standard Borosilicate Glass 3.3 |
|---|---|---|
| SiO₂ Purity | ≥ 99.99% | ~ 80 - 81% |
| Continuous Working Temp | 1100 °C (Short term 1300 °C) | 500 °C (Short term 520 °C) |
| Thermal Shock Resistance | ΔT > 1000 °C (Water Quench Proof) | ΔT ≈ 150 °C |
| UV Transmittance (λ = 200 - 350 nm) | > 85% - 90% (JGS1 / JGS2) | Opaque below 310 nm |
| Dielectric Strength | 25 - 40 kV/mm | 10 - 20 kV/mm |