Product Overview
Quartz transparent gauge glass is a clear visual inspection window used in transparent level gauges and sight glass fittings. It is selected when the process needs direct liquid-level reading with strong resistance to thermal shock and high operating temperatures.
This product is also known as quartz sight glass, fused silica sight glass, transparent quartz level gauge glass, and clear gauge glass. Quartz glass is widely used where visibility, heat resistance, and stable optical performance are required in high-temperature and high-pressure process equipment.
Typical Applications
Quartz transparent gauge glass is suitable for transparent level gauges, inspection windows, process viewing points, and other equipment that requires direct observation of liquids, especially in demanding thermal environments. Quartz sight-glass applications include high-temperature and pressure service, and quartz glass sight glasses are offered in round, longitudinal, and square forms for fitting compatibility.
Material and Performance
Quartz glass is a high-purity silica material. Technical references describe it as resistant to water and strong acids, with low resistance to alkali compared with some other glass types. It is also known for a low coefficient of thermal expansion and resistance to sudden temperature change.
Technical Parameters
| Item | Specification |
|---|---|
| Material | Fused silica / quartz glass |
| Product type | Transparent gauge glass / quartz sight glass / transparent sight glass |
| Optical character | Clear transparent viewing window |
| Density | 2.203 g/cm³ |
| Mohs hardness | 5 to 7 |
| Young’s modulus | 743 × 10³ kg/cm² |
| Compressive strength | 11,500 kg/cm² |
| Tensile strength | 500 kg/cm² |
| Bending strength | 700 kg/cm² |
| Softening point | 1,630 °C |
| Maximum continuous temperature | 1,000 °C |
| Limited-life temperature | 1,300 °C |
| Coefficient of expansion | Approx. 5 × 10⁻⁷ |
| Chemical resistance | Resistant to water and strong acids; lower resistance to alkali |
| Typical service note | Suited to high-temperature process observation and sight-glass service |
Common Sizes and Fabrication Range
Quartz sight-glass data shows custom dimensions with a diameter range of 10 mm to 350 mm and a thickness range of 3 mm to 25 mm. Quartz sight glasses are also offered in round, longitudinal, and square formats, so the final size is normally matched to the gauge frame or drawing rather than fixed to one universal standard.
| Size Item | Range |
|---|---|
| Shape | Round / longitudinal / square |
| Diameter | 10–350 mm |
| Thickness | 3–25 mm |
| Special dimensions | Available on request |
Advantages
Quartz transparent gauge glass is chosen for applications that need stable visibility under heat, good thermal shock resistance, and a transparent viewing path for level reading. Optical-grade fused quartz is also used in sight-glass applications and high-temperature, high-pressure service, which supports its use as a clear process-viewing material.
