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Square O-Rings

Square rings, or Kantseals®, are an alternative for O-rings in axial static applications. Square rings have high sealing capacity and shape stability and are therefore very resistant to extrusion, high pressures and vibrations. Keep in mind that O-rings generally provide a more positive seal because the circular cross-section allow for more concentrated unit loading.

Suitable for

  • Static applications at pressures up to 50 MPa.

Not suitable for

  • Dynamic applications.
  • Applications with a low closing force.
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Square O-ring FKM brown Brown rubber square ring zoomed
Square O-ring FKM brown
Brown rubber square ring zoomed

Advantages

  1. High extrusion resistance.
  2. Dimensionally stable under pressure.
  3. Stable sealing solution with high resistance to rolling during assembly.

How do Square O-Rings work?

How do square rings work

A Square ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. After installation the ring is  slightly compressed to seal at low pressures. When a square o-ring is pressurised, it’s forced to “flow” within the groove toward the clearance gap.  In comparison to O-rings, the square shape allows the sealing solution to be exposed to higher pressures without the use of a Back-Up ring.

Technical Specifications

Movement type

Static

Available sizes

Any size available upon request.

Hardness range

70 +/-5 Shore (90 Shore for high pressures)

Temperature range

NBR:

-40° to +108° C

EPDM:

-55° to +155° C

FKM:

-25° to +204° C

Pressure range

≤ 500 bar

Available materials

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

Available compliances

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

Available standards

AS 568A, DIN 3701, BS 1806/ BS 4518, JIS B2401, JIS NFT47-501, SMS 1568 en ISO 3601.

Common Square Ring Types

Type Nitrile (NBR)

NBR Square 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 Square 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 Square 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

We believe in the quality of our products and service. Fill out the form and one of our skilled engineers will contact you within the next business day.

Contact details

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