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PTFE Seals and Guides

Product catalog summary

Overview: The document provides a detailed guide on PTFE seals and guides, emphasizing their reliability and performance in industrial applications. It discusses various seal types, specifications, applications, and the advantages of PTFE compounds.

Product Range: PTFE products are categorized into memory packings, piston rings, spring-energized seals, and shaft seals with PTFE sealing lips. Each category is explored with dedicated sections on features and applications.

Technical Consulting Support: ElringKlinger offers technical consulting for seal design, installation proposals, and quotations, supported by a technical questionnaire for detailed inquiries.

Performance and Reliability: PTFE compounds are highlighted for their wear resistance, high sliding speeds, and thermal stress tolerance, suitable for low-lube and oil-free applications with chemical resistance to aggressive media.

Innovations in Plastics: ElringKlinger leads in developing tailored PTFE solutions, ensuring economic and reliable performance in demanding fields.

Quality and Environmental Policy: The company is certified under ISO/TS 16949 and DIN EN ISO 14001, focusing on quality and environmental protection.

Benefits of PTFE Seals: Key benefits include chemical resistance, suitability for high thermal loads, low friction, and high wear resistance, with special types for the food and pharmaceutical industries.

Rotary Shaft Seals: Designed for radial contact pressure on shafts, suitable for various media including lubricants, chemicals, and foodstuffs, used in compressors, gearboxes, and other machinery.

Housing Materials and Secondary Seals: Standard materials include stainless steel and aluminum, with secondary seals made from FPM, NBR, EPDM, and PTFE composites.

Design and Operating Limits: Details on design features and operating limits of different seal types, including maximum peripheral speed, temperature range, and pressure load.

Special Features: Special versions of seals are available for specific applications, such as dual lip designs for separating media and friction-optimized types for reduced heat generation.

Technical Data and Testing: Includes data on hydrodynamic return feed spiral grooves, long-term wear in dry conditions, and power losses and friction torques, providing insights into PTFE seals' performance under various conditions.

Specifications: Outlines specifications for shaft surface roughness, with Rz values ranging from 2 to 3 µm, and details on shaft diameters and corresponding power loss at various rotary speeds.

Procedures: Radial force is measured using the two-jaw method according to DIN 3761, with fitting instructions for PTFE shaft seals emphasizing the protection of the sealing lip during installation.

Standards and Recommendations: Recommended surface roughness for contact surfaces is Ra = 0.2 – 0.63 µm, Rz = 1 – 3 µm, and Rmax = 1 – 4 µm, with specific recommendations for hard surfaces.

Design and Engineering Instructions: Discusses the design of locating holes and the importance of surface roughness, highlighting the benefits of PTFE shaft seals.

Applications: Spring-energized seals are used in industries like automotive, aerospace, food processing, and medical technology, suitable for sealing reciprocating pistons and rods, as well as rotary and static applications.

Key Data from Tables and Graphs: Includes tables detailing shaft diameters, groove dimensions, and operating limits for different seal types, with graphs illustrating power loss and dynamic friction torque at various speeds and pressures.

Benefits: Highlights the advantages of PTFE shaft seals, such as outstanding dry-running characteristics, high dimensional stability, and a good cost-benefit ratio.

Overview of Seal Types and Applications:
Piston and Rod Seals: Designed for various applications, including extra-large installation dimensions and high-pressure loads, offering a cost-effective and easy-to-assemble solution.
Rod and Shaft Seals: Use an O-ring as a static seal, providing excellent sealing effects even on rough surfaces.
Static Flange Seals: Suitable for internal and external pressures, with operating limits ranging from -95°C to +300°C and pressures up to 700 bar.
Spring-Energized Seals: Use metal springs to maintain contact pressure across temperature ranges, with different spring types affecting sealing performance, friction, and wear.
Spring Materials: Standard materials include stainless steel, with special materials like Hastelloy® and Elgiloy® available for specific applications.
Installation and Surface Quality: Proper installation and surface quality are crucial for seal performance, with recommendations for avoiding sharp edges and ensuring good surface finishes.
Memory Packings: Single-acting sealing elements offering excellent sliding properties, used in various industries, providing low friction and long service life.
Applications: Used in compressors, vacuum pumps, food processing, and painting technology, with the sealing effect achieved through the memory effect of the compound.

Technical Specifications: Operating limits for various seals are provided, with temperature ranges and pressure limits specified for different types.

Specifications: Outlines various types of seals and their specifications, including EMS, EMT, EMTX, EMH, and EMHX, with specific dimensions and part numbers.

Procedures: Installation dimensions for standard types are provided, with special versions offering benefits like cost-effectiveness and ease of assembly.

Technical Details: Discusses the displacement force of memory packing compared to other seals, highlighting its low friction behavior, with design and fitting instructions for rod and piston seals.

Materials and Benefits: PTFE is highlighted for its low friction, chemical resistance, and wide thermal operating range, with benefits of PTFE piston rings discussed.

Applications: Lists various applications for the seals, including compressors, gas rotary pumps, and automotive technology, with descriptions of different types of piston ring joints.

Guide Rings and Bands: Prevent contact between the piston/rod and cylinder wall, with versions available for different applications, providing operating limits and installation examples.

Composite Seals: Used for sealing pistons and rods, consisting of a profile ring and an O-ring, offering benefits like low wear and good dry-running properties.

Specifications and Operating Limits:
- Maximum sliding speed: 4 m/s
- Temperature range: –45 °C to +200 °C
- Maximum service pressure: 400 bar

Fitting Instructions:
- Use lead-in chamfers and fitting tapers for cylinder barrel and piston rod.
- Debur and chamfer sharp edges, cover thread crests, and remove contaminants.
- Avoid sharp-edged fitting tools.
- Grease or oil sliding surfaces and seals, avoiding lubricants with solid additives.
- Heat PTFE rings in oil or hot water to 80 °C to 120 °C for easier assembly.

Surface Quality:
- Dynamic contact surface Rz ≤ 1.0 µm, Rmax ≤ 2.0 µm
- Static groove diameter Rz ≤ 6.3 µm, Rmax ≤ 12.5 µm

Seal Types and Groove Dimensions:
- MRA and MRI composite seals with specific groove dimensions based on installation conditions.
- SRI and SRA seals for rod diameters with specific fitting instructions.

Rotary Composite Seal:
- Maximum rotation speed: 2.5 m/s
- Temperature range: –45 °C to +200 °C
- Maximum service pressure: 300 bar

V-Packings and Kits:
- Used for sealing rods with axial motion, consisting of V-packings, base, and end rings.
- Benefits include no stick-slip, low wear, good sealing performance, and high reliability.

Compound Table:
- PTFE compounds tailored for specific applications with various fillers for optimization.
- Applications include low sliding speeds, high pressure resistance, and chemical resistance.

Technical Questionnaire:
- Includes sections for application description, contact surface, installation space, operating conditions, and special needs.

Contact Information:
- ElringKlinger Kunststofftechnik GmbH, Bietigheim-Bissingen, Germany.
- Phone: +49 7142 583-0, Fax: +49 7142 583-200, Email: [email protected]

Catalog excerpts

Seals and Guides Made from PTFE. For Reliable Service and Top Performance

Open the catalog to page 1

Seals and Guides made from PTFE: The Product Range Shaft Seals with PTFE Sealing Lip Non-wearing – low friction – chemically resistant Spring-Energized Seals Compact – universal – predictable Memory Packings Groove sealing rings with excellent sliding properties Piston Rings Oil-free – the environmental challenge to industry Innovations Made from Plastics Technical Consulting Support With its seals and engineering design elements ElringKlinger Kunststofftechnik has been one of the technology leaders in its Top Performance and Functional Reliability We will be happy to support you in designing...

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Guide Rings and Bands, Lamination Stick-slip-free – low friction Miscellaneous Seals, e.g. Composite Seals, V-Packings Compound Table Technical Questionnaire Quality and Environmental Policy Top quality and an active commitment to environmental protection are key to ElringKlinger’s sustained success in the marketplace. That is why we are certified according to ISO/TS 16949 and DIN EN ISO 14001. Sealing elements for rotary applications Sealing elements for reciprocating applications (2) ) Diagrams The information provided in these diagrams is based on comparative values (1) Limit Values determined...

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Rotary Shaft Seals with PTFE Sealing Lips Rotary shaft seals with PTFE seal ing lips are sealing elements – ready for assembly – which produce the desired sealing effect through The requisite radial contact pres - radial contact pressure on the shaft. sure is assured by selecting the Sealing performance in the receiv suitable PTFE compound and sealing ing hole is achieved by compression lip geometry as well as a special manufacturing process. Radial seals with PTFE sealing lips are ideally suited for sealing To cover a wide range of application rotating shafts. requirements, standard ranges...

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Application Examples Shaft seal in a spur gear type HN 2580. Fields of Application Shaft seals with PTFE sealing lips are suitable for sealing applications involving the following media: Typical Applications • Rotary compressors lubricants • Pharmaceutical products and • Screw-type compressors • Transmissions/gearboxes • Blower systems for certain PTFE compounds) • Chemical waste water and wash water • Corrosive, fluid and gaseous media • Powders and granulates • Coolant and lubricant fluids • Water and steam • Resins, glues and pastes • Air/oxygen (BAM tests for certain PTFE compounds • Heat...

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Shaft seal in a radial-flow fan with nitrogen scavenging, type HN 2390. Shaft seal in a rotary compressor with oil drainage, type HN 2390. Shaft seal in a spindle boring head type HN 2390, friction-optimized. Shaft Seal Design and Action Principle Housing Secondary Seal PTFE Sealing Lip Housing Secondary Seal PTFE Sealing Lip with protection lip Housing Materials Standard: Special versions: Free-cutting steel Mild steel (unalloyed sheet metal for deep drawing) Aluminum Secondary Seal The following materials are used for the secondary seal between the PTFE lip and the housing: Standard: Special...

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Other Special Versions Type HN 2390 Stock List Designation example: rotary shaft seal with PTFE sealing lip for shaft diameter d1 = 75, locating hole d2 = 100 and width w = 10: RWDR HN 2390 75 x 100 x 10 Standard Thanks to its high wear and pressure resistance this standard design is suitable for a wide range of applications, such as pumps, blowers and compressors. Sealing lip compound: • PTFE compound HS 21037 Design features: • Single lip • Reinforced sealing lip • Lip is effectively supported to resist deformation under pressure Properties: • Good sealing performance with pressurized media...

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Other Special Versions Type HN 2390 Dual lip, rotating in same direction, with or without hydrodynamic return feed spiral groove, good seal ing performance, higher operational reliability, e.g. for pumps, screw-type and rotating compressors. Friction-Optimized Special Type Stock List Vis-à-vis the standard version of Designation example: rotary shaft seal with PTFE sealing lip for special type has a significantly shaft diameter d1 = 70, locating lower coefficient of friction. hole d2 = 78 and width w = 6: RWDR HN 2390 Special Type, Friction-Optimized 70 x 78 x 6 Sealing lip compound: • PTFE...

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Stock List Special Type, Friction-Optimized Standard version for pressureless Designation example: rotary shaft applications and/or pressures seal with PTFE sealing lip for shaft centrifugal machines and blowers. slightly above atmospheric. This ver- sion features a highly flexible seal- lip. Suitable applications include d1 mm 10 tools and pumps. 12 15 18 Standard compound: 20 • PTFE-compound HS 21059 25 30 35 Design features: 35 • Single-part sealing and protective 40 40 lip 45 • Sealing lip with wear protection 48 • Low radial pre-loading of sealing lip 50 55 60 Properties: 65 • Suitable for...

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Hydrodynamic Return Feed Spiral Groove In case of higher sealing performance requirements to be met by PTFE rotary shaft seals we recommend a spiral groove for hydrodynamic return feed either on the shaft surface or in the sealing lip. In this case, only one rotational direction of the shaft is permissible. Return Feed Spiral Groove in the Return Feed Spiral Groove in the Shaft Surface/Protection Sleeve The hydrodynamic return feed spiral The hydrodynamic return feed spiral groove should have the following groove is worked into the PTFE sealing lip. To prevent dirt from be ing carried into the...

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Long-Term Wear in Dry-Running (Oil-Free) Conditions (2) Test conditions: Test atmosphere: air T = 100 °C v = 4 m/s p = 0.42 N/mm2 Verschleißvolumen Rz = 2 µm PTFE unfilled Aluminum hard-anodized

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Power Losses and Friction Torques Type HN 2390 standard and HN 2390 special, Dynamic friction torque (2) Type HN 2390 special, friction-optimized, Test conditions: Dimensions: 15 x 30 x 7, PTFE compound HS 21037, dynamisches Reibmoment Temperature = room temperature/self-heating Verlustleistung HN 2390 HS 21037 Sealing lip compound: Standard und HN 2390 Sondertype Shaft diameter: Surface roughness of shaft: Dynamic friction torque [Nm] 0,06 Pressure stages Dichtlippe 1 mm Stärke Dichtlippe Lip thickness 1 mm 0,7 mm Stärke Rotary speed [1/min] HN 2390 (reibungsoptimiert) Radial force (2) The radial...

Open the catalog to page 13

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