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Glass Vac™ Vacuum Chambers — Aluminum & Stainless Steel Our Glass Vac vacuum chambers are complete, shop-ready systems designed, built, and 100% tested in the USA. A unique, reversible industrial-grade silicone gasket (no adhesives) lets the tempered glass lid seal even if set slightly off-center, and doubles gasket life. Every chamber is helium/vacuum tested prior to shipping to ensure a leak rate of no more than 2.5 inHg per 24 hours and to verify a max vacuum of ~-29 inHg (±0.5 inHg at sea level). Components are rated for elevated temperatures; as a vacuum vessel the maximum operational temperature is 160 °F (the gasket itself withstands up to ~390 °F). Lids can be cleaned with common solvents. Glass Vac™ Vacuum Chambers — Aluminum & Stainless Steel Our Glass Vac vacuum chambers are complete, shop-ready systems designed, built, and 100% tested in the USA. A unique, reversible industrial-grade silicone gasket (no adhesives) lets the tempered glass lid seal even if set slightly off-center, and doubles gasket life. Every chamber is helium/vacuum tested prior to shipping to ensure a leak rate of no more than 2.5 inHg per 24 hours and to verify a max vacuum of ~-29 inHg (±0.5 inHg at sea level). Components are rated for elevated temperatures; as a vacuum vessel the maximum operational temperature is 160 °F (the gasket itself withstands up to ~390 °F). Lids can be cleaned with common solvents.