Screw Compressor Seals

Product Description

Semi-hermetic reciprocating compressors and screw compressors are large compressor types typically used in both commercial and industrial applications. These compressors are required to have a large capacity in order to supply large amounts of energy continuously. Therefore, the corresponding compressor seals must be able to transfer high power in a continuous and stable manner over long periods.

A typical application for semi-hermetic compressors is industrial refrigeration.
In a supermarket, for example, the doors of a cooled display case are constantly opening and closing. Semi-hermetic compressors enable precision-calibrated refrigeration in environments like this where the temperature changes frequently, which necessitates the use of screw compressor seals and semi-hermetic feedthroughs.


Semi-hermetic compressors and their seals are typically used in applications that are not in harsh, high-pressure environments but still demand quality, high-output components. In a semi-hermetic compressor, the seal is incorporated using screws. This is a unique design different from other refrigeration and air conditioning compressor seals. Semi-hermetic compressors and screw compressor seals are produced in an array of designs to meet the varying requirements of size and current allowances in a multitude of applications.


Screw compressor seals are suitable for use in both semi-hermetic reciprocating compressors and semi-hermetic screw compressors.

Technical Details


Glass-to-metal compressors are hermetically sealed. For more information about our glass-to-metal technology, please click on this page. Alternatively, you can find out about our GTMS products from the GTMS brochure.

Features / Specifications
Material information
Pin Fe-Cr, Fe-Ni,
Copper core Fe-Cr, Cr-Cu
Eyelet Fe, Stainless steel
Glass Soda Barium glass
Insulation material Silicon rubber
Phenol resin block
Others Tab

Air tightness ~1.0×10-9Pa m3/sec
Insulation resistance 1000MΩ Min. at DC500V
Withstand voltage AC2500V ~1min. (Leak current : 1mA)
Withstanding pressure (Water) 3.1MPa - 1min. (Thickness : 15mm)
6.3MPa - 3min. (Thickness : 25mm)

Forms of Supply and Product Packaging

Standard forms of supply are available. Please contact our sales department if you have questions or special requests concerning supply and packaging.


All of our glass-to-metal sealing products are manufactured in our ISO 9001/14001 certified plant, the quality assurance standard of ISO. For more information, please click here.
Exhibitions & Events
Exhibition CIOE - China International Optoelectronic Exposition, Shenzhen, China, 09-01 to 09-03-2021
Exhibition Gastech, Singapore, Singapore, 09-13 to 09-16-2021
Electronic Packaging
SCHOTT North America, Inc.

15 Wells Street
Southbridge, MA 01550
E-Mail to SCHOTT+1 (508) 765-7450
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