It is used for electrical or electronic parts that must be secure against water vapor and foreign bodies to maintain proper functioning and reliability.
The alchemists invented a process for making an airtight glass tube, which they used for distillation. PTFE tapePTFE resin string, and wax are other alternatives that are finding widespread use, but require a little care when winding onto the joint to ensure a good seal is produced.
Solvents, reaction mixtures, and old grease show up as transparent spots. A potential drawback of such grease is that if used on laboratory glassware for a long time in high-temperature applications such as for continuous distillationthe grease may eventually contaminate the chemicals.
In landscape and exterior construction projects, airtight seals protect general service and landscape lighting electrical connections and splices.
A thin layer of grease made for this application can be applied to the ground glass surfaces to be connected, and the inner joint is inserted into the outer joint such that the ground glass surfaces Sealed air each Sealed air next to each other to make the connection.
Left — Krytoxa fluoroether-based grease; Right — a silicone-based high vacuum grease by Dow Corning. Optical transparency of the narrow sealing ring pressured by glass joint right.
Grease can be removed by wiping with an appropriate solvent; ethersmethylene chlorideethyl acetateor hexanes work well for silicone - and hydrocarbon -based greases. Under low energy buildingpassive houselow-energy houseself-sufficient homeszero energy buildingand superinsulation standards, structures must be more air-tight than previously.
Cleaning[ edit ] Ground glass joints are translucent when physically free of debris and clean. Uses[ edit ] A hermetically sealed battery Some kinds of packaging must maintain a seal against flow of gases: Most chemists simply wipe them off as much as possible.
Certain epoxy resins and their processes can create a hermetic bond to copper, brass, or epoxy itself with similar coefficients of thermal expansionand are used in the manufacture of hermetic electrical and fiber optic hermetic seals.
This type of glass-to-metal hermetic seal is the weaker of the two types and is generally used for low-intensity applications such as in light bulb bases. Air barriers, careful sealing of construction joints and service penetrations holes for pipes, etc.
Choosing between glass versus ceramic depends on the application, weight, thermal solution and material requirements. Green buildings may include windows that combine triple-pane insulated glazing with argon or krypton gas to reduce thermal conductivity and increase efficiency.
Ceramic seals exceed the design barriers of glass to metal seals due to superior hermetic performance in high stress environments requiring a robust seal. Hermetic sealing for airtight conditions is used in archiving significant historical items.
Declaration of Independenceand U. Completed packages, however, involve heat seals, joints, and closures that often reduce the effective barrier of the package. InThe U. For example, the glass of a glass bottle may have an effective total barrier but the screw cap closure and the closure liner might not.
However, some fluorinated solvents can remove fluoroether greases, but are more expensive than laboratory solvents. Buildings designed with sustainable architecture principles use airtight technologies to conserve energy.
Compression seals can withstand very high pressure and are used in a variety of industrial applications.Sealed Air on the Fortune via @FortuneMagazine.
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