Glass-to-metal seals
Glass to stainless steel and Kovar, with CF or ISO flange
Glass-to-metal seals connect glass components directly to a UHV system or attach glass accessories to a metal chamber.
With a CF flange they are suitable for pressures down to 1.3·10⁻¹¹ mbar (10⁻¹¹ Torr), with an ISO flange and O-ring for the medium pressure range. Almost every standard version is also available modified to your specifications.
Metal
304 stainless steel, Kovar
Glass
Pyrex 7740, 7052, quartz
Temperature
−270 to 450 °C
Flange
CF, ISO or none
Features
- Glass to 304 stainless steel: direct seal with glasses from 0080 to 7740 (Pyrex)
- Glass to Kovar: direct to glasses 7040, 7052 and 7056, graded to 7070, 7720 and 7740 (Pyrex)
- Stainless steel bellows with Pyrex 7740 at one or both ends, in two spring lengths
- double-ended glass adapters and sealed-off adapters with domed end
- with CF flange, ISO flange or as a weld-on tube end
- other stainless steels, diameters, lengths and glass types on request
Technical data
| 304 stainless steel to glass | Pyrex 7740, 7052 glass, quartz; temperature range −270 to 450 °C |
|---|---|
| Kovar to glass | Pyrex 7740, 7052 glass; temperature range −270 to 425 °C |
| Note on Kovar | Phase transformation possible below −80 °C |
| Stainless steel bellows to glass | Pyrex 7740 at one end (cuff or flange at the other) or at both ends |
| Other designs | double-ended glass adapters, sealed-off adapters with domed end |
| Connection | CF flange (UHV, down to 1.3·10⁻¹¹ mbar), ISO flange with O-ring, tube end |
| Delivery | on request, also as a custom version |
Which version is right?
The flange, material, pressure range and process determine the version. We clarify this with you and Hositrad and also source custom-made parts to drawing.