Turcon® Variseal®
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Your Partner for Sealing Technology Trelleborg Sealing Solutions is a major international developer, manufacturer and supplier of seals, bearings and molded components in polymers. We are uniquely placed to offer dedicated design and development from our market-leading product and material portfolio: a one-stop-shop providing the best in elastomer, silicone, thermoplastic, PTFE and composite technologies for applications in aerospace, industrial and automotive industries. With 50 years of experience, Trelleborg Sealing Solutions engineers support customers with design, prototyping,...

Latest information available at www.tss.trelleborg.com • Edition August 2020 TRELLEBORG SEALING SOLUTIONS • 3

TURCON® VARISEAL® ■ Choosing the Right Seal for your Appplication ■ Choosing the Right Seal for your Application Turcon® Variseal® offers major benefits in the design of components such as cylinders. These include: - Excellent leakage control - High resistance to wear - High resistance to extrusion into gaps - Withstanding aggressive and abrasive process media - Very good temperature capabilities - Low friction - Compact form Turcon® Variseal® is available in a range of geometries and designs that allow the optimum profile to be selected for each application. They can be produced from a...

General Turcon® Variseal® are single acting, spring-energized seals which are used for dynamic and static applications. Variseal® are effective in a wide range of applications. They are chosen when higher resistance to chemical media is required, if the seal is required to operate in extremes of temperature and/or where good extrusion and compression characteristics are needed. PERFoRMAnCE The different types of Variseal® designs combined with the properties of Turcon® and Zurcon® materials offer design engineers a wide range of solutions to a large number of applications. The most...

TURCON® VARISEAL® ■ General Table 1: Turcon® Variseal® Selection TableSeal Type Page !) Maximum operating temperature +80 °C (+176 °F). In a pressure-free state, sterilization is possible for a short period at higher temperature 6 • TRELLEBORG SEALING SOLUTIONS Latest information available at www.tss.treNeborg.com • Edition August 2020

Table 3: Turcon® and Zurcon® Material Selection Guide For temperatures above 500 °F (260 °C), please reference the Society of Plastics Industry’s Safe Handling Guide. * MF grade materials have compliance to FDA, EU or Chinese GB standards. Contact your local Trelleborg Sealing Solutions marketing company for detailed compliance information. Latest information available at www.tss.trelleborg.com • Edition August 2020 TRELLEBORG SEALING SOLUTIONS • 7

TURCON® VARISEAL® ■ Turcon® Seal Materials ■ Turcon® Seal Materials Turcon® materials are high performance thermoplastics specifically developed for sealing applications. They are based on premium-grade PTFE fluoropolymer resins, with the properties of each compound achieved by the addition of fillers and special processing techniques. Turcon® materials offer the following benefits: Low Coefficient of Friction Friction is dependent on pressure, contact surface area, speed and lubrication. Turcon® materials have very good friction characteristics. For example, a coefficient of friction on...

Zurcon® Seal Materials Zurcon® Seal Materials Zurcon® Z80 Zurcon® Z80 is a virgin Ultra High Molecular Weight Polyethylene, or UHMWPE. Because the water absorption of Zurcon® Z80 is zero, it is ideal for water service. Its abrasion resistance is five to ten times higher than PTFE, making it the material of choice in abrasive environments. As it is physiologically safe, it is also suitable for use in food and pharmaceutical processing. Wear Resistance The abrasive wear resistance of Zurcon® Z80 is 5 to 10 times higher than that of PTFE based materials. It is therefore recommended in...

TURCON® VARISEAL® ■ Zurcon® Seal Materials Zurcon® Z48 (TPE) Thermoplastic elastomer (TPE) materials combine several of the most desirable features of high performance elastomers and flexible plastics. They have exceptional toughness and resilience, with high resistance to creep, impact and fatigue. The premium grades used in the Variseal® are fully machinable as well as injection moldable and have the following notable properties. Sealing ability TPE conforms well to mating surfaces and, when energized by a spring load, has very good resilience making it an excellent sealing material with...

Spring Types and Materials Spring Types and Materials A metal spring is incorporated into Turcon® Variseal® to provide elasticity to the seal. This makes the seal permanently elastic, despite changes in operating temperature, pressure or chemicals processed. Each of the three spring types used in Variseal® has unique properties that give them their performance characteristics. The two most important properties of the spring, besides the corrosion resistance of the metal, are load value and deflection range. The spring load affects sealing ability, friction and the wear rate of the seal. The...

TURCON® VARISEAL® ■ Quality Criteria Spring Materials The standard spring material for Turcon® Variseal® is stainless steel (spring code S). Two further materials are available for the specific applications, as detailed in the table below. Table 4: Spring Materials Selection Guide ® Hastelloy is a registered trademark of Haynes International, Inc. ® Elgiloy is a registered trademark of the Elgiloy Specialty Metals Alternative brand may be used. 1) NACE-approval ■ Quality Criteria Seals and bearings manufactured by Trelleborg Sealing Solutions are continuously monitored according to strict...

Hardware Design Considerations ■ Hardware Design Considerations The best way to obtain optimum Variseal® performance is to plan ahead - during the design phase of your product. The initial phase should bring into alignment the three factors having the greatest impact on seal performance - the hardware design, the service conditions, and the seal design. Design issues such as gland style, mating surface hardness and surface finish, and dynamic alignment should be reviewed and adjusted to work with the intended service conditions and to suit the selected seal design. The information in this...