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JIS B8286 Tempered Sight Glass for Pressure Vessels | High-Strength Circular Viewing Window
JIS B8286 tempered sight glass for pressure vessels, reactors, boilers, and industrial process equipment. High-strength circular viewing windows available in standard and custom sizes with worldwide delivery and EN 10204 3.1 certification support.
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Technical data
JIS B8286 Tempered Sight Glass Overview
JIS B8286 sight glasses are engineered for safe visual inspection of pressure vessels and industrial processing equipment. Manufactured from thermally toughened safety glass, these circular sight windows provide excellent mechanical strength, reliable sealing performance, and clear observation under demanding operating conditions.
Designed in accordance with the Japanese Industrial Standard JIS B8286, these sight glasses are widely used in pressure vessels, chemical reactors, storage tanks, autoclaves, boilers, pharmaceutical equipment, and process systems where visual monitoring is critical.
Our precision manufacturing process ensures accurate dimensions, polished sealing surfaces, and consistent quality for long-term industrial service.
JIS B8286 Tempered Sight Glass— Technical Data
| 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°C | 280°C | 280°C | 280°C |
| Transition temperature | 490°C | 550°C | 720°C | 820°C |
| Vertical relaxation temperature | 530°C | 590°C | 790°C | 890°C |
| Softening point | 700°C | 820°C | 920°C | 950°C |
| Heat resistance | ≤180°C | ≤300°C | ≤375°C | ≤375°C |
| 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 |
Cross-section drawing
Dimensions — JIS B8286 Tempered Sight Glass
| STANDARD PRODUCT RANGE AS PER JIS B8286 | STANDARD PRODUCT RANGE AS PER JIS B8286 (INCH) | ||||
|---|---|---|---|---|---|
| Dimensions d1 x s (mm) |
Inspection aperture d2 (mm) |
Permissible pressure (in bar) |
Dimensions d1 x s (inch) |
Inspections aperture d2 (inch) |
Permissible pressure (in psi) |
| 31,6 x 12,75 | 20 | 150 | 1.244 x 0.502 | 0.787 | 2175 |
| 34 x 17 | 24 | 200 | 1.339 x 0.669 | 0.945 | 2900 |
| 35 x 7 | 25 | 25 | 1.378 x 0.276 | 0.984 | 363 |
| 40 x 10 | 30 | 40 | 1.575 x 0.394 | 1.181 | 580 |
| 40 x 12 | 30 | 50 | 1.575 x 0.472 | 1.181 | 725 |
| 45 x 10 | 32 | 40 | 1.772 x 0.394 | 1.26 | 580 |
| 45 x 12 | 32 | 50 | 1.772 x 0.472 | 1.26 | 725 |
| 50 x 10 | 35 | 25 | 1.969 x 0.394 | 1.378 | 363 |
| 50 x 12 | 35 | 40 | 1.969 x 0.472 | 1.378 | 580 |
| 55 x 10 | 40 | 25 | 2.165 x 0.394 | 1.575 | 363 |
| 60 x 10 | 45 | 16 | 2.362 x 0.394 | 1.772 | 232 |
| 60 x 12 | 45 | 25 | 2.362 x 0.472 | 1.772 | 363 |
| 60 x 15 | 45 | 40 | 2.362 x 0.591 | 1.772 | 580 |
| 60 x 20 | 45 | 95 | 2.362 x 0.787 | 1.772 | 1377 |
| 63 x 8 | 48 | 8 | 2.480 x 0.315 | 1.89 | 116 |
| 63 x 10 | 48 | 16 | 2.480 x 0.394 | 1.89 | 232 |
| 63 x 12 | 48 | 25 | 2.480 x 0.472 | 1.89 | 363 |
| 63 x 15 | 48 | 40 | 2.480 x 0.591 | 1.89 | 580 |
| 65 x 10 | 50 | 12 | 2.559 x 0.394 | 1.969 | 174 |
| 65 x 15 | 50 | 40 | 2.559 x 0.591 | 1.969 | 580 |
| 70 x 12 | 55 | 16 | 2.756 x 0.472 | 2.165 | 232 |
| 70 x 15 | 55 | 25 | 2.756 x 0.591 | 2.165 | 363 |
| 75 x 12 | 60 | 16 | 2.953 x 0.472 | 2.362 | 232 |
| 80 x 10 | 65 | 10 | 3.150 x 0.394 | 2.559 | 145 |
| 80 x 12 | 65 | 16 | 3.150 x 0.472 | 2.559 | 232 |
| 80 x 15 | 65 | 25 | 3.150 x 0.591 | 2.559 | 363 |
| 80 x 20 | 65 | 40 | 3.150 x 0.787 | 2.559 | 580 |
| 90 x 10 | 70 | 8 | 3.543 x 0.394 | 2.756 | 116 |
| 92 x 10 | 72 | 8 | 3.622 x 0.394 | 2.835 | 116 |
| 95 x 10 | 75 | 6 | 3.740 x 0.394 | 2.953 | 87 |
| 95 x 15 | 75 | 16 | 3.740 x 0.591 | 2.953 | 232 |
| 100 x 10 | 80 | 7 | 3.937 x 0.394 | 3.15 | 101 |
| 100 x 12 | 80 | 10 | 3.937 x 0.472 | 3.15 | 145 |
| 100 x 15 | 80 | 16 | 3.937 x 0.591 | 3.15 | 232 |
| 100 x 20 | 80 | 25 | 3.937 x 0.787 | 3.15 | 363 |
| 100 x 25 | 80 | 40 | 3.937 x 0.984 | 3.15 | 580 |
| 113 x 15 | 88 | 10 | 4.449 x 0.591 | 3.465 | 145 |
| 115 x 15 | 90 | 10 | 4.528 x 0.591 | 3.543 | 145 |
| 120 x 15 | 95 | 10 | 4.724 x 0.591 | 3.74 | 145 |
| 125 x 15 | 100 | 10 | 4.921 x 0.591 | 3.937 | 145 |
| 125 x 20 | 100 | 16 | 4.921 x 0.787 | 3.937 | 232 |
| 125 x 25 | 100 | 25 | 4.921 x 0.984 | 3.937 | 363 |
| 125 x 30 | 100 | 40 | 4.921 x 1.181 | 3.937 | 580 |
| 130 x 15 | 105 | 10 | 5.118 x 0.591 | 4.134 | 145 |
| 135 x 25 | 110 | 25 | 5.315 x 0.984 | 4.331 | 363 |
| 150 x 10 | 125 | 2 | 5.906 x 0.394 | 4.921 | 29 |
| 150 x 15 | 125 | 8 | 5.906 x 0.591 | 4.921 | 116 |
| 150 x 20 | 125 | 10 | 5.906 x 0.787 | 4.921 | 145 |
| 150 x 25 | 125 | 16 | 5.906 x 0.984 | 4.921 | 232 |
| 150 x 30 | 125 | 25 | 5.906 x 1.181 | 4.921 | 363 |
| 175 x 20 | 150 | 10 | 6.890 x 0.787 | 5.906 | 145 |
| 175 x 25 | 150 | 16 | 6.890 x 0.984 | 5.906 | 232 |
| 175 x 30 | 150 | 25 | 6.890 x 1.181 | 5.906 | 363 |
| 200 x 20 | 175 | 8 | 7.874 x 0.787 | 6.89 | 116 |
| 200 x 25 | 175 | 10 | 7.874 x 0.984 | 6.89 | 145 |
| 200 x 30 | 175 | 16 | 7.874 x 1.181 | 6.89 | 232 |
| 250 x 20 | 225 | 4 | 9.843 x 0.787 | 8.858 | 58 |
| 250 x 25 | 225 | 8 | 9.843 x 0.984 | 8.858 | 116 |
| 250 x 30 | 225 | 10 | 9.843 x 1.181 | 8.858 | 145 |
| 265 x 30 | 240 | 8 | 10.433 x 1.181 | 9.449 | 116 |
| Other sizes can be customized | |||||
KEY FEATURES
Thermal Stability
High resistance to thermal shock for extreme temperature environments
High Mechanical Strength
Suitable for pressure-loaded industrial systems
Chemical Resistance
Stable performance in corrosive chemical environments
Excellent Transparency
Clear visibility for process monitoring
Precision Manufacturing
Accurate dimensions and polished sealing surfaces
Custom Design Support
OEM / ODM customization available
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Chemical Reactors
- Pressure Vessels
- Storage Tanks
- Boilers
- Pharmaceutical Equipment
- Food Processing Systems
- Industrial Observation Ports
FAQ
A: JIS B8286 is a Japanese industrial standard covering circular tempered sight glasses used in pressure vessel observation applications.
A: Yes. JIS B8286 sight glasses are specifically designed for pressure vessel observation ports and industrial process equipment.
A: Chemical processing, petrochemical, pharmaceutical, food processing, power generation, and industrial manufacturing industries commonly use JIS B8286 sight glasses.
A: Yes. We provide OEM and ODM manufacturing, private labeling, and customized packaging services.
A: Please provide operating pressure, temperature, media, dimensions, and installation details. Our engineering team will recommend the appropriate sight glass specification.
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