Description
Vacuum Generators Ltd Viewport 8" OD 5.25" VP Stainless Flange Needs Glass
This is a stainless steel vacuum chamber viewport flange manufactured by Vacuum Generators Ltd of Hastings, England. The assembly consists of a heavy, precision-machined stainless steel ring flange with a full bolt-hole pattern around the perimeter and a central circular window opening approximately 5.25 inches in diameter. The glass pane is cracked and is not suitable for vacuum service without replacement — the flange body itself shows no visible structural damage.
Specifications & What's Included
- Manufacturer: Vacuum Generators Ltd, Hastings, England
- Outside Diameter (OD): 8 inches
- Viewport / Window Port Diameter: 5.25 inches
- Material: Stainless steel (machined ring flange)
- Bolt pattern: Multiple bolt holes evenly spaced around outer flange ring
- Glass/window: Present but cracked — requires replacement before use
- Flange body: Structurally intact, sealing surfaces and bolt holes appear undamaged
- Includes: Viewport flange assembly only
Applications
Viewport flanges like this one are used on vacuum chambers to provide a transparent optical access port — allowing visual observation, optical measurement, or laser beam entry/exit without breaking vacuum. They are standard components in high-vacuum (HV) and ultra-high-vacuum (UHV) systems used in semiconductor processing, surface science research, thin-film deposition (PVD/CVD), electron microscopy chambers, and general scientific vacuum apparatus. Vacuum Generators Ltd (VGL) was a well-regarded British manufacturer of vacuum equipment and components, particularly associated with the surface science and UHV research community from the 1960s through the 1990s; their flanges and chambers are still found in university and national laboratory settings worldwide. This flange body is a candidate for reglazing by a vacuum optics or glass-to-metal seal specialist, or it may serve as a source of hardware (flange ring, bolts, sealing groove) for chamber repair or modification.
This Vacuum Generators Ltd stainless steel viewport flange (8" OD, 5.25" viewport port) is being sold as-is for parts or repair. The glass pane is cracked and is not serviceable in its current state — the flange body itself appears structurally intact with no visible damage to the stainless steel ring, bolt holes, or sealing surfaces. The unit was made by Vacuum Generators Ltd in Hastings, England. It would be suitable for reglazing by a vacuum optics specialist or as a source of hardware. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Vacuum Generators Ltd |
Model: |
VP 5.25 Viewport |
MPN: |
VP 5.25 |
SKU: |
27646 |
Type: |
Vacuum Chamber Viewport Flange |
Outside Diameter (OD): |
8 inches |
Viewport Port Diameter: |
5.25 inches |
Material: |
Stainless Steel |
Country/Region of Manufacture: |
United Kingdom |
Compatible With: |
High vacuum and UHV chamber systems |
Seller Notes: |
Viewport flange body only — glass is cracked and requires replacement before use. |
Form Factor: |
Flanged Ring / Viewport Assembly |
Condition Notes: |
This Vacuum Generators Ltd viewport flange (8" OD / 5.25" VP) is sold as-is for parts or repair. The glass is cracked and not serviceable. The stainless steel flange body appears intact. Suitable for reglazing or parts use. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |