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X-Rings | Quad-Rings®

X-rings, or Quad rings®, are an alternative for O‐rings. X-rings have four lips and therefore they have at least four sealing surfaces. The benefits are: high stability, space for lubricants between the sealing lips (both favorable with dynamic applications) and a parting line that is not on a sealing surface. Quad rings have a high sealing efficiency even in low pressure applications.

Suitable for

  • Low pressure static/light dynamic applications.
  • Applications where low closing force is required.
  • Applications where the sealing solution is subjected to torsion during assembly/operation.

Not suitable for

  • High pressure applications.
  • High speed dynamic applications.
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Advantages

  1. Higher sealing capacity in comparison to O-rings
  2. Stable sealing solution with high resistance to rolling in dynamic applications
  3. High resistance to spiral failure
  4. The four lips on a X-ring create a groove for lubrication. This reduces friction in dynamic applications.

  5. Less compression force is required due to the multi-lobed design. Therefor less squeeze is required, reducing friction and wear.

How do X-Rings work?

How do X-rings work

An X-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. An X-ring has at least four sealing surfaces. When an X- ring is installed, the X-ring is slightly compressed to seal at low pressures. When an X- ring is pressurised, the X-ring is forced to “flow” within the groove toward the clearance gap. The small area between the sealing surfaces can be filled with lubricant to reduce friction and increase lifetime in dynamic applications.

Technical Specifications

Movement type

Static, Light dynamic rotating/reciprocating

Surface speed

Reciprocating:

≤ 0.5 m/s

Rotating:

≤ 2 m/s

Available sizes

Any size available upon request.

Pressure range without Back-Up ring

Static:

≤ 50 bar

Reciprocating:

≤ 50 bar

Rotating:

≤ 50 bar

Pressure range with Back-Up ring

Static:

≤ 400 bar

Reciprocating:

≤ 300 bar

Rotating:

≤ 150 bar

Temperature range

NBR:

-40° to +108° C

EPDM:

-55° to +155° C

FKM:

-25° to +204° C

Available materials

NBR, EPDM, FKM, CR, FVMQ, HNBR, FFKM, PU, VMQ

Available compliances


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

Common X-Ring Types

Type Nitrile (NBR)

NBR X-rings have good resistance to mineral oils, greases and water up to 100° C. NBR is not compatible with most solvents, strong acids, fuels with high aromatic content and ozone/weathering.

Type EPDM

EPDM X-rings have good resistance to hot water, hydraulic fluids, silicone oils and silicone greases. EPDM is not compatible with mineral oils, mineral greases and hydrocarbons.

Type Viton® (FKM)

FKM X-rings have excellent resistance to most chemicals, mineral oils, greases, fuels, ozone and aromatic hydrocarbons. FKM is not compatible with organic acids that have low molecular weight and glycol based brake fluids.

Materials

Rubber Material Characteristics Specifics Applications
NBR, XNBR, Nitrile
Krynac®, Nipol®

Temperature range:

-40° to +108° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Excellent fuel resistance
  • Excellent oil resistance
  • High abrasion resistance
  • High resistance to heat aging

O-rings, Rubber Moulded Parts, light dynamic seals mineral based oil applications. Gaskets in oil and gas applications.
General purpose sealing solutions.

FKM, Fluorocarbon
Viton®, DAI-EL®, Dyneon®, Tecnoflon®

Temperature range:

-25° to +204° C

Chemical resistance:

Physical properties:

Relative Cost:

  • High chemical stability
  • Low gas permeability
  • Excellent resistance in mineral oils

O-rings and light dynamic seals in fuel applications. General purposes sealing solutions where high chemical resistance is required.

FFKM, Perfluoroelastomer
Fluorezi®, Chemraz®, Isolast®, Parofluor®, Simriz®

Temperature range:

-30° to +325° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Superior temperature resistance
  • Superior chemical properties

O-rings and rubber moulded parts where extreme temperature and chemical resistance is required, like chemical processing and high temperature fuel applications.

EPM, EPDM, Ethylene Propylene
Buna EP®, Keltan®, Nordel®, Vistalon®

Temperature range:

-55° to +150° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Excellent weather resistance
  • Good steam resistance
  • Compatible with brake fluids

Outdoor sealing applications. O-rings and Gaskets in drinking water applications.

VMQ, PVMQ, Silicone
KE®, Silastic®, Silplus®, Tufel®

Temperature range:

-54° to +232° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Excellent weather resistance
  • Generally non toxic
  • Good fatigue resistance
  • High elongation

Heat exchanger Gaskets, Hollow O-rings for low pressure applications.

FVMQ, Fluorosilicone
FE®, Silastic LS®

Temperature range:

-55° to +180° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Similar properties as VMQ with improved mineral and synthetic oil resistance

Diesel turbocharger and charge air cool hoses, exhaust hangers, wire and cable insulation.

FEPM, Tetrafluoroethylene Propylene
Aflas®, Dyneon BRF®, Viton VTR®

Temperature range:

-20° to 204° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Excellent steam resistance
  • Superior resistance to strong bases

O-rings in cooling water applications. Sealing solutions in high temperature steam applications.

HNBR, Hydrogenated Nitrile
Therban®, Zetpol®

Temperature range:

-30° to +150° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Similar properties as NBR with improved environmental resistance and chemical properties.

O-rings, hoses and membranes which require a high abrasion resistance.

PU, Polyurethane
Adiprene®, Estane®, Millathane®, Morthane®, Pellethane®, Texin®, Vibrathane®

Temperature range:

-50° to +108° C

Chemical resistance:

Physical properties:

Relative Cost:

  • Excellent extrusion resistance
  • High wear resistance

O-rings and shaft seals in high pressure applications. Sealing solutions in hydraulic cylinders and CO2 Firearms.

Contact Us

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Contact details

  • +31 (0) 226 362 233
  • info@newdealseals.com
  • Energiestraat 2-5, 1749 DN Warmenhuizen, Nederland