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D-Ring Seals

D-rings are an alternative for O-rings. A D-ring has the same sealing characteristics as an O-ring, but the flat base ensures better stability in the groove. This eliminates the risk of spiral failure, which occurs primarily during assembly and in dynamic applications.

Suitable for

  • Light dynamic applications.
  • Applications where the sealing solution is subjected to torsion during assembly/operation.

Not suitable for

  • High speed dynamic applications.
  • Applications where low closing force is required.
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FKM Rubber D-ring Blue D-ring Seal
FKM Rubber D-ring
Blue D-ring Seal

Advantages

  1. Stable sealing solution with high resistance to rolling in dynamic applications.
  2. High resistance to spiral failure.
  3. D-rings fit in existing O-ring grooves.

How do D-Rings work?

A D-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. When the ring is pressurised, it’s forced to “flow” within the groove toward the clearance gap.

The D-ring has a flat surface to prevent twisting during movements. After installation, the ring is slightly compressed to seal at low pressures.

Technical Specifications

Movement Type

Static, Light dynamic rotating/reciprocating

Size range

Any size available upon request

Temperature range

NBR:

-40° to +108° C

EPDM:

-55° to +155° C

FKM:

-25° to +204° C

Hardness range

Static:

70 +/-5 Shore

Rotating:

90 Shore

Available materials

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

Available standards

DIN11851

Available compliances

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

D-Ring Types

Type DP

Type DP can be used in piston grooves for effective sealing in static to light dynamic applications.

Movement type:

  • Static.
  • Light dynamic rotating/ reciprocating.

Type DR

Type DR can be used in rod/housing grooves for effective sealing in static to light dynamic applications.

Movement type:

  • Static.
  • Light dynamic rotating/ reciprocating.

Type DF

Type DF can be used in flange/face grooves for effective sealing in static applications.

Movement type:

  • Static.

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