Bellows have predictable expansion rates

An Abssac product story
Edited by the Engineeringtalk editorial team May 30, 2006

Miniature metal bellows are now available from Abssac for metallic hermetic seal use.

Miniature metal bellows are now available from Abssac for metallic hermetic seal use.

The bespoke electroforming process produces incredibly accurate, volume compensating bellows structures with predictable expansion rates.

Ideal uses include pressure and temperature sensors, flexible connectors, and countless other applications where quality, dependability, reliability and long life are critical requirements.

The bellows are seamless and nonporous.

No dust, dirt or moisture can lodge in seams and cause contamination in critical applications.

The bellows can also be liquid or gas filled for various applications.

Electrodeposited bellows are manufactured by forming a mandrel to the shape of the inside of the bellows, depositing the proper thickness of spring quality metal on to the mandrel, trimming the plated mandrel to define the ends, and finally dissolving away the mandrel.

This leaves behind a thin convoluted tubular shell of plated metal, which is the bellows.

The finely tuned electroplating process also allows careful control of the bellows wall thickness.

In fact bellows walls can be made thinner than the other types (down to 0.0003in) making them they are extremely sensitive.

As the sole UK distributor Abssac supplies the Servometer bellows which can be designed for compression strokes up to 60% of their free length.

Combined with a greater ID/OD ratio, this gives them a volume displacement capacity equal to or larger than most other types of bellows.

The bellows can be manufactured leak tight to 10e-9cm3/s and verified by mass spectrometer.

Find out more about this article. Request a brochure, download technical specifications and request samples here.

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