Model: HHLST.
Overview
The DIN 7080 Thermally Toughened Borosilicate Round Sight Glass Disc for Pressure Vessel Boiler Pipeline is supplied as a sight / viewing glass made from Borosilicate Glass 3.3 (COE 3.3×10/K). Listed geometry: size Od From 50mm to 500mm, equal shape. Optical / electrical data: transmittance ≥91%, sheet resistance ≥230ºC instant temp difference. Temperature -100ºC ~ 280ºC (continuous). Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Shape | Equal |
|---|---|
| Size | Od From 50mm to 500mm |
| Head Code | Square |
| Model NO. | HHLST |
| Connection | Female |
| Item | High Pyrex Pressed Round Sight Glass |
| Process | Cut, Polish, Ground, Tempered |
| Property 1 | Borosilicate Heat Resistant |
| Shipment | by Sea, by Air, by Courier |
| Executive Standard | DIN 7080 (German Industrial Standard) |
| Raw Material | Borosilicate Glass 3.3 (COE 3.3×10/K) |
| Processing | Thermal prestressed toughening, edge grinding & polishing |
| Working Temperature | -100ºC ~ 280ºC (continuous) |
| Thermal Shock Resistance | ≥230ºC instant temp difference |
| Pressure Rating | 10bar / 16bar / 25bar / 40bar / customized up to 200bar |
| Light Transmittance | ≥91% |
| Common Standard Sizes (OD×Thickness) | Ø40×5mm, Ø50×8mm, Ø65×10mm, Ø80×12mm, Ø100×15mm, Ø125×18mm, Ø150×20mm |
| Custom Service | Custom outer diameter, thickness, pressure grade, laser marking |
| 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 (COE 3.3×10/K)”; name the glass and thickness.
- Temperature and pressure — listed as “-100ºC ~ 280ºC (continuous)”; 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 “Equal”; send a drawing with outline, holes and edge finish.
Engineering guides for this part
For material grades and coating options, see Optical Glass Material Options for Precision Filters and Windows. How parts like this are machined and finished is covered in Glass Wafer Coring for Custom Circular Components. 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.
