Hollow O-Rings | O-Ring Cord

Hollow O-rings are an alternative to standard O-rings, when low closing force is required. The reduced closing force is achieved by replacing the solid cross-section by a hollow cross-section, without reducing the material hardness. Hollow O-rings are used for instance for sealing lids and doors.

Suitable for

  • Low pressure static applications.
  • Applications where low closing force is required.
  • Applications with rough surface finish.

Not suitable for

  • High pressure applications.
  • Dynamic applications.
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Red silicone hollow o-ring
Red silicone hollow o-ring


  1. Low closing force
  2. Easy to make large sizes I.D. < 1000 mm

How do Hollow O-Rings work?

Hollow O-rings work the same as regular O-rings. An O-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. When placed under pressure, the ring is forced to “flow” within the groove toward the clearance gap. As the ring flows against the gap, it produces zero clearance and prevents the sealed substance from escaping. The difference between a regular O-ring and a Hollow ring is the fact that the hollow core makes it much more easy to compress the ring.

Technical Specifications

Movement type


Size range

Any size available upon request

Temperature range


-40° to +108° C

Silicone (VMQ):

-54° to +232° C

Available materials


Available compliances

KTW, USP, NSF 51 61, WRC, WRAS, FDA, R67 01

Hollow O-Ring Types

NBR hollow o-ring profile

Type Nitrile (NBR)

NBR hollow O-rings can be used in static applications where low closing force is required. Nitrile has a good general oil/fuel resistance, but poor ozone and weathering resistance.

Silicone hollow o-ring profile

Type Silicone (VMQ)

Silicone hollow O-rings can be used in static applications where low closing force is required. VMQ has a good heat resistance up to 232° C in hot air and up to 100° C in water. It offers excellent resistance to ozone and weathering.


Rubber Material Characteristics Performs well in Does not perform well in
NBR, XNBR, Nitrile
Krynac®, Nipol®

Temperature range:

-40° to +108° C

Abrasion resistance:

Tear/Wear resistance:

Relative Cost:

  • Water
  • Petroleum Oils & Fluids
  • Hydraulic Oils
  • Low temperatures
  • Ozone, weathering
  • Acids
  • Solvents
  • Fuels with high aromatic content
  • Glycol based brake fluids
VMQ, PVMQ, Silicone
KE®, Silastic®, Silplus®, Tufel®

Temperature range:

-54° to +232° C

Weather resistance:

Ozone resistance:

Relative Cost:

  • Water
  • Cold
  • Dry heat
  • Low temperatures
  • Ozone, weathering
  • Abrasion
  • Dynamic applications
  • Acids and alkalis
  • Aromatic mineral oil
  • Steam (>120° C)
  • Hydrocarbon based fuels

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Contact details

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  • info@newdealseals.com
  • Energiestraat 2-5, 1749 DN Warmenhuizen, Nederland