Handmade Vacuum Tube Envelope, Soda-Lime Glass, 30mm Dia. x 8cm Long

Glass vacuum-tube envelope, 30mm OD to 7mm OD exhaust. Fuse against a matching stem (tube and slot shapes are available) to produce a complete vacuum tube ready for vacuum processing.

Our envelopes are inspected individually. We guarantee reliable, stress-free fusing against our other soda-lime glass items.

• Material: Soda-Lime Glass (Schott AR-Glas®; Hydrolitic Class 3)
• Envelope Outside Diameter: 30mm ±.29 (1.181" ±.11)
• Envelope Wall Thickness: 1.5mm ±.06 (.059" ±.002)
• Envelope Length: 8cm (3.14")
• Exhaust Tube Outside Diameter: 7mm (.276")
• Exhaust Tube Wall Thickness: .9mm (.035")
• Exhaust Tube Length: 9cm (3.5")
• End Execution: Fire-Polished
• Max. Straightness Error: ±1mm in 10cm (±.04" in 3.94")

® AR-Glas is a registered trademark of Schott AG.