Your Reliable Partner For Custom Special Glass In China
Specialglass supplies quartz glass (fused silica, SiO₂) for the applications where ordinary optical glass gives out — under extreme heat, aggressive chemistry, or demanding UV-to-IR optics. With purity above 99.99% SiO₂, continuous service to ~1000 °C, and one of the lowest thermal expansion coefficients of any glass (~5.5 × 10⁻⁷/°C), quartz glass holds its shape and clarity through thermal shock that would crack borosilicate. We supply it as plates, tubes, cylinders, and rings — cut, ground, and polished to your drawing.
Quartz glass earns its place in high-tech industry, research, and development on three properties working together. Its near-zero thermal expansion makes it almost indifferent to temperature swings — it withstands continuous service to ~1000 °C and survives rapid heating and quenching. It resists nearly every chemical, yielding only to hydrofluoric acid and hot concentrated phosphoric acid. And it transmits light cleanly from the deep UV through the near IR, which is why it does double duty as both a structural and an optical material in the same demanding environments.
Two production routes give quartz glass its grades, and the route determines both purity and optical reach:
These map onto the standard optical grades: synthetic material covers the deep-UV JGS1 (185–2500 nm) and UV JGS2 (220–2500 nm) bands, while low-hydroxyl JGS3 (260–3500 nm) serves the infrared, suppressing the ~1400 nm water-absorption band for clean IR transmission.
| Property | Specification |
|---|---|
| Purity (SiO₂) | ≥99.99% |
| Continuous service temperature | ~1000 °C |
| Short-term max temperature | ~1200 °C |
| Softening point | ~1730 °C |
| CTE (0–300 °C) | ~5.5 × 10⁻⁷/°C |
| Refractive index (589 nm) | ~1.4585 |
| Density | ~2.2 g/cm³ |
| Transmittance band | 185–3500 nm (grade-dependent) |
| In-band transmittance | >90% |
| Chemical resistance | Resists all common acids and solvents except HF and hot concentrated H₃PO₄ |
Thermal, density, and expansion figures are intrinsic to fused silica and apply across all grades; transmittance bands are grade-specific.
We supply quartz glass in the geometry your application needs, finished from customer drawings:
Send dimensioned drawings (DWG/DXF/PDF) with thickness, quantity, and edge requirement, and our team will quote your glass cutting project.
