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Endless, Ring-Shaped Sealing Elements

O-rings are primarily manufactured from elastomer materials. The O-ring achieves its sealing effect by deformation of the cross-section after installation and compression in the installation space. O-rings are mainly used for static sealing of gaseous and liquid media. Under certain conditions, the dynamic use of an O-ring is also possible. O-rings of the product brand Dichtomatik are manufactured according to DIN ISO 3601-1, industry class B and the surface deviations according to DIN ISO 3601-3, special characteristic N. For special applications, the permissible tolerances for special articles can be restricted to industry class A and the form and surface deviations to grade characteristic S.

Benefits at a Glance

  • Numerous standard dimensions available from stock
  • Special elastomer materials also available in different Shore hardnesses and colors upon request
  • Special e. g. metal detectable, encapsulated O-rings
  • Segment-specific-certified materials available
  • Product modification possible
  • Universally applicable
  • Good lifetime
  • Very good price-performance ratio
  • Suitable for many industrial applications

Important note: Dichtomatik products comply with common industrial standards and therefore are suitable for many applications excluding safety-critical ones like Automotive. Premium Freudenberg products are the right choice for all applications ensuring highest quality and safety standards and therefore optimal total cost of ownership.


Choose the Right Product 

Out of Several Types of Gasket Materials

  • EPDM (sulfur cross-linked temp.: -45 to +130 °C; peroxide crosslinked temp.: -50 to +150 °C): hot water, steam, detergents, caustic soda and potash, silicone oils and greases, many diluted acids and chemicals, glycol-based brake fluids – no mineral oil-based oils and greases
  • FKM (temp.: -15 to +200 °C): mineral and synthetic oils, engine oils, HFD flame-resistant pressure fluids, aliphatic, aromatic and chlorinated hydrocarbons, water (max. +80 °C), good weathering, ozone and ageing resistance
  • NBR (temp.: -30 to +100 °C): mineral oils and greases, hydraulic oils (H, HL, HLP), flame-resistant pressure fluids HFA and HFB. HFC up to about +50 °C and water up to a maximum of +80 °C
  • HNBR (temp.: -30 to +150 °C): see NBR – additional heat, ozone and aging stability and wear resistance
  • VMQ (temp.: -55 to +200 °C): resistance in water (up to +100 °C), aliphatic engine and transmission oils, animal- and plant-based oils and greases
  • FEP encapsulated with VMQ core (temp.: -60 to +205 °C) or FKM core (temp.: -20 to +205 °C): resistant to aggressive acids, bases, alcohols and oils
  • A particularly very good material regarding application temperature and media resistance is FFKM of the Dichtomatik brand.

For more detailed information on resistances as well as special applications, standard dimensions, tolerances, materials, certifications, and design guidelines for static and dynamic applications, please download our O-ring brochure.

Please note that resistances, pressures and temperatures are mutually influenced by various parameters.

    Related Documents

  • Brochures 66-plus 67-minus


    Product Overview - Dichtomatik Brand

    Tailor-Made Seals and Service Portfolio

    English | PDF | 4228 KB


    O-Ring Brochure

    O-rings are made of elastomeric materials in moulds by vulcanisation.

    English | PDF | 2653 KB

  • Solutions Sheets 66-plus 67-minus



    O-rings are endless, ring-shaped sealing elements with a circular cross-section that are manufactured from elastomer materials or PTFE.

    English | PDF | 159 KB


    O-Ring Tolerances

    O-Ring Tolerances according to DIN ISO 3601-1:2013-11 (Class B)

    English | PDF | 619 KB

Product Portfolio

Sealing products setting benchmarks

Premium products and individual sealing solutions of the Freudenberg brand are the perfect choice for any application. Uncompromising quality (0-defect strategy) and excellent performance ensure full safety and optimized total cost of ownership (TCO).

Freudenberg O-Rings 70-external-link