Pneumatics and hydraulics
In the pneumatics and hydraulics industry, O-rings are used in numerous cylinders, valves, controls, connecting elements, fittings and hose connections, on shafts or internally.
Moulded articles
O-Rings
SIEGEL Dichtungen is your manufacturer of O-rings to DIN 3771 and ISO 3601, for static and dynamic sealing. We produce them as closed rings straight from the mould, without untidy butt vulcanisation or bonded joints, from approx. 0.6 x 0.5 mm up to inside diameters of approx. 2,000 mm and cross-sections up to 60 mm.
Materials
Various elastomers & TPE
Approvals
DIN 3771 · ISO 3601
Manufacturing
Compression or injection moulded
Series
Small to large series
Your benefits
Why O-Rings from SIEGEL
Closed-ring production
Endless from the mould, without untidy butt vulcanisation or bonded joints, even in large dimensions.
Large size range
From approx. 0.6 x 0.5 mm up to inside diameters of approx. 2,000 mm and cross-sections up to 60 mm.
Wide range of materials
NBR, EPDM, CR, H-NBR, FKM/FPM (Viton), FFKM, silicone and TPE. The right solution for every application, on request also to various standards and approvals.
Surface options: coatings
On request with coatings such as molybdenum disulphide (Molykote), graphite, silicone or PTFE coating, also LABS-free.
Technical data
Product specifications
Specifications may vary depending on the material option. Contact us for further information or specific requirements.
Material
NBR, EPDM, CR, silicone (MVQ, FVMQ, LSR), Viton (FPM, FKM), FFKM and TPE.
Standards
Manufactured to DIN 3771 and ISO 3601, stock range to DIN 3771, PG or metric.
Dimensions
Various inside diameters and cross-sections, special sizes possible.
Temperature resistance
Available for a wide temperature range for reliable sealing in different environments.
Chemical resistance
Resistant to chemicals, acids, alkalis, oils, fuels and other media.
Coatings
Molybdenum disulphide (Molykote), graphite, talc, and silicone and Teflon coating.
Colours
Black as standard, various RAL shades and individual requests, e.g. yellow for gas lines.
Approvals
On request KTW, DVGW, EN 16421 (W270), FDA, BfR, EC 1935/2004 and UL94 V for drinking water, food and flame-retardant applications.
Your application
Special requirements for material or standard?
Tell us about your application, for example media, temperature ranges or standards. We recommend the material and the matching manufacturing process and provide samples in advance on request.
Materials & standards
Suitable materials & approvals
O-Rings are manufactured from the following materials and, on request, designed to meet the relevant standards and approvals. The linked pages provide details on properties, resistances and regulations.
Process
Manufacturing & processes
More on manufacturing & tolerances
What are O-rings and how are they made?
O-rings are a widely used sealing solution for static and dynamic applications, named after the round cross-section of the cord. We produce them endlessly from the mould, so even large dimensions are made without untidy butt vulcanisation or bonded joints.
Depending on the component and quantity, we manufacture using compression moulding (CM), transfer moulding (TM) or injection moulding (IM). With shorter heating and cycle times and faster demoulding, injection moulding is the most commonly used manufacturing process for O-rings.
After vulcanisation, the O-rings are initially held in a flash mat or star-shaped sprue. In cryogenic deburring with nitrogen, all production residues and remaining flash are removed using liquid nitrogen and by tumbling the parts for a precisely defined time.
Applications
Industries & applications
Electrical industry
Insulation and sealing of components, control cabinets, connectors and cable glands, including strain relief, kink protection and protection against moisture, on request also as EMC seals.
Mechanical and plant engineering
Used in sealing systems, connections and electrical assemblies, providing reliable protection against dust, dirt and media, also as buffers.
Fastening and connection technology
Secure fixing and sealing of components in pipelines, plug connections, wall mountings, enclosures and closure mechanisms.
FAQ
Frequently asked questions
Do O-rings meet specific standards and approvals?
On request and depending on the application, we design O-rings to various standards and approvals: KTW and DVGW for drinking water applications, EN 16421 (W270) for high hygiene standards, FDA, BfR and EC 1935/2004 for direct food contact, and UL94 V for self-extinguishing, flame-retardant versions.
Do you offer tailor-made solutions?
Yes. We manufacture from small to large series, keep many common sizes to DIN 3771, PG or metric in stock and, on request, produce coloured versions, e.g. yellow for gas lines or company colours. Coatings such as molybdenum disulphide (Molykote), graphite, silicone or PTFE coating as well as LABS-free versions can be applied afterwards.
Product range
Related products
Cooperation
The right O-Rings for your application?
Tell us about your application, for example media, temperature ranges or standards. We recommend the material and the matching manufacturing process and provide samples in advance on request.