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Low closure force seals

JBL Hollow Cross-Section, Low-Closure-Force (LCF) Seals Reduce Bolt Loading and Flange requirements - The need for easy-to-compress, low-closure-force seals is rapidly increasing in many commercial, electronic and communications applications. If you require efficient, reliable seals for light-weight enclosures with minimal bolts, fasteners or latches in combination with thin sheet metal or plastic flanges, consider JBL LCF Seals. LCF Seals can drastically reduce the amount of closure force (compression) and the resulting stress generated on the sealed components. Hollow Cross-Sectional Seals offer the seal designer and user a low-closure-force sealing solution for many applications. LCF Seals may be supplied as either:

  • Long Length Extrusions 
  • Spliced Rings/Gaskets
  • Cut to Length Extrusions

To date, the most common method for reducing closure force has been to reduce the Shore hardness of the elastomeric seal material or change to a foam-type of material. The best method to achieve a dramatic reduction in closure-force is to change from a solid to a hollow cross-sectional profile without lowering the Durometer hardness. Controlling wall thickness is key to lowering the lbs/in compression force required.


Outdoor electronic enclosures that require an easy to assemble gasket, environment sealing with no groove, and low closure-force when used with thin sheet metal or plastic covers and or minimal latches, hinges or bolts


  • Outdoor electronic enclosures, Outdoor cable junction boxes
  • Outdoor fiber optic junction boxes, outdoor pole or building mounted telephone Equipment Enclosures
  • Indoor electronic and electrical enclosures
  • Semiconductor Process Door sealing
  • Telecommunication enclosures
  • Other Low-Closure-Force, “No-Groove”, applications.


Many electronic and telecommunications enclosure manufacturers require low-closure-force, easy to assemble gaskets and seals. Parker’s new pressure sensitive adhesive (PSA) backed hollow-D Extrusion and advanced four corner slicing technology provides excellent environmental/dust sealing with very low-closure-force by utilizing a hollow cross section seal profile.

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