Overview
Tubular Level Gauge Glass Clear Sight Glass Tube is a sight / viewing glass made from Borosilicate Glass 3.3. Listed geometry: size Od From 6mm to 300mm. Optical / electrical data: transmittance ≥92%, sheet resistance ΔT ≤ 180ºC. Temperature -20ºC ~ +280ºC. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Borosilicate Glass 3.3 |
|---|---|
| Size | Od From 6mm to 300mm |
| Transmittance | ≥92% |
| Process | Cut, Polish, Ground, Tempered,Printing |
| Property 1 | Borosilicate Heat Resistant |
| Shipment | by Sea, by Air, by Courier |
| Item | Tubular Level Gauge Glass Sight Glass Tube |
| Clear plain tubular gauge glass | Full transparent wall, suitable for clean, colored liquid observation. |
| Red line sight gauge glass | Built-in distinct red longitudinal indicator line, clearer liquid level dividing line under low light, standard choice for boiler water level monitoring. |
| Working Temperature | -20ºC ~ +280ºC |
| Thermal Shock Resistance | ΔT ≤ 180ºC |
| Working Pressure | ≤1.6MPa (custom high-pressure tube available) |
| Styles | Clear transparent tube / Single red line indicator tube |
| Size Range | OD 6mm~50mm, customizable ID & full length as drawings |
| Surface | Bubble-free, scratch-free, smooth cut ends |
| Support OEM & ODM | Custom diameter, length, red line position, end grinding processing |
| Strict 3-layer inspection before delivery | Size tolerance, internal defects, temperature resistance test |
| Safe export packaging | Individual foam tube + carton, anti-breakage for sea & air shipment |
| Packaging | Separated EPE foam tube packaging, hard export carton, shockproof anti-crack protection |
| Temperature resistance | Long working temperature ≤ 450 ° C, short time working ≤ 500 ° C |
| Light transmission rate | 95% up |
| Hydraulic Water-resistant strength | More than test 40Kgf/cm ² |
| Thermal stability | T300 ° C |
| Linear expansion coefficient (0-300 ° C) | 3.3 × 10-7 K-1 |
| Softening temperature | 820° C |
| Supplier | Jinan Honhai Glass Company Limited |
What to specify when you request a quote
- Glass type and thickness — listed as “Borosilicate Glass 3.3”; name the glass and thickness.
- Temperature and pressure — listed as “-20ºC ~ +280ºC”; give working temperature, thermal shock and any pressure rating.
- Strengthening and safety — listed as “More than test 40Kgf/cm ²”; state tempering, lamination or the safety standard.
- Outline and edges — listed as “Od From 6mm to 300mm”; send a drawing with outline, holes and edge finish.
Engineering guides for this part
For material grades and coating options, see How to Use and Maintain JGS2 Quartz Glass for Optical Windows and Custom Parts. How parts like this are machined and finished is covered in Precision Bore Glass Tubing Processing: End-to-End Manufacturing for Industrial Buyers. For an application example, read Quartz Glass Windows for High-Temperature Appliance Modules. Before sending a drawing, check Quartz Glass Manufacturing: Controlling Thermal Conductivity in Fused Silica. A related standard product is AR Anti-Reflection Optical Window.
