A seal made by fusing together metallic powders with a glass binder, for such applications as hermetically sealing ceramic packages for integrated circuits.


Related Terms

PINCH-OFF BLADES

In blow molding, the part that compresses the parison to seal it prior to blowing, and to allow easy cooling and removal of flash.

O RING

A flat ring made from synthetic rubber, used as an airtight seal or a seal against high pressures.

LOOP TRANSFER FUNCTION

For a feedback control system, the ratio of the Laplace transform of the primary feedback signal to the loop seal Laplace transform of the actuating signal.

INFLATABLE GASKET

A gasket whose seal is activated by inflation with compressed air.

HOUSKEEPER SEAL

A vacuum-tight seal made between copper and glass by bringing the copper to a flexible feather edge before fusing it to the glass; the copper then flexes as the glass shrinks during cooling.

HETERODYNE FREQUENCY METER

A frequency meter in which a known frequency, which 269 heterodyne frequency meter hermetic seal An airtight seal. heterodyne measurement may be adjustable or fixed, is heterodyned with an unknown frequency to produce a zero beat or an audio-frequency signal whose value is measured by other means. Also known as heterodyne wavemeter.

FLUID COMPATIBILITY

The suitability of filtration medium and seal materials for service with the fluid involved.

BELLOWS

Corrugated cylindrical container which moves as pressures change, or provides a seal during movement of parts.

COMPRESSOR SEAL

Leak proof seal between crankshaft and compressor body in open type compressors.

BALANCE PISTON

Reaction turbines have axial thrust because pressure on the entering side is greater than pressure on the leaving side of each stage. To counteract this force, steam is admitted to a dummy (balance) piston chamber at the low-pressure end of the rotor. Some designers also use a balance piston on impulse turbines that have a high thrust. Instead of piston, seal strips are also used to duplicate a piston's counter force.

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