JIS B8286 Tempered Sight Glass — Pressure Vessel Viewports
Certified tempered sight glass manufactured to JIS B8286 for pressure vessel visual access. Available in soda-lime tempered, borosilicate, fused silica (quartz) and sapphire options; stocked sizes and custom machining with batch COA and tempering reports.
Description
Certified tempered sight glass manufactured to JIS B8286 for pressure vessel visual access. Available in soda-lime tempered, borosilicate, fused silica (quartz) and sapphire options; stocked sizes and custom machining with batch COA and tempering reports.
Key features
- Manufactured to JIS B8286 requirements for sight glasses used in pressure vessels.
- Material options: Soda-lime tempered glass, Borosilicate glass (higher heat/chemical resistance), Fused silica (optical/DUV) and Sapphire glass(maximum mechanical & thermal performance).
- Stocked standard sizes per JIS B8286 matrix; custom diameters, thicknesses, edge finishing, holes and countersinks manufactured to drawing.
- Full batch documentation: tempering report, material COA (EN 10204-style), and optional He-leak / vacuum compatibility documents for metalized windows.
- Safety: tempered glass fragmentation pattern, dimensional tolerances and recommended mounting/gasket guidance included.
Typical specifications
| JIS B8286 — Glass material properties | ||||
|---|---|---|---|---|
| Property | Soda-lime | Borosilicate | Aluminosilicate | Alkali resistance |
| Pressure resistant performance | 10–40 Bar | 10–64 Bar | 10–320 Bar | 10–400 Bar |
| Thermal Shock | 150℃ | 280℃ | 280℃ | 280℃ |
| Transition temperature | 490℃ | 550℃ | 720℃ | 820℃ |
| Vertical relaxation temperature | 530℃ | 590℃ | 790℃ | 890℃ |
| Softening point | 700℃ | 820℃ | 920℃ | 950℃ |
| Heat resistance | ≤180℃ | ≤300℃ | ≤375℃ | ≤375℃ |
| Density | 2.5 g/cm³ | 2.21 g/cm³ | 2.60–2.70 g/cm³ | 3.4–3.95 g/cm³ |
| Young’s modulus | 72 GPa | 66 GPa | 84 GPa | 112 GPa |
| Flexural strength | 120–160 MPa | 120–160 MPa | 240–320 MPa | 420–450 MPa |
| Water resistance (ISO 719) | Level 1 | Level 1 | Level 1 | Level 1 |
| Acid resistance (DIN 12116) | A1 | A1 | A1 | A1 |
| Alkali resistance (ISO 695) | A2 | A2 | A2 | A1 |
Download typical JISB 8286 Tempered Sight Glass datasheet: JIS B8286 Tempered Sight Glass
Applications & industries
- Pressure vessels sight glass, boiler sight glass, reaction tanks sight glass and process equipment in petrochemical, chemical, power generation and food processing industries.
- Instrument panels, inspection ports and replacement sight glass for Japanese/Asian OEM equipment.
