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Special fittings for validations

Rubber fab’s sanitary gasket guidelines

Tuf-Flex® is the world’s first unitized gasket, setting new standards for purity, performance and flexibility. A Tuf-Flex® Gasket’s contact surface is PTFE unitized to an EPDM rubber inner core. This totally bonded construction provides a PTFE gasket with the mechanical characteristics, including memory, of an elastomer gasket. Designed to meet critical requirements in biopharmaceutical, ultrapure water, WFI (water for injection) and difficult food and beverage processing.

Food-Flex™ is setting new standards for purity and performance for the food and beverage industries. Food-Flex™ will not absorb product, thus eliminating flavor transfer and reducing the need for costly gasket changeouts. A contact surface of PTFE unitized to a Buna rubber inner core provides a PTFE gasket with the inert, non-stick characteristics and memory of an elastomer gasket without pigmentation or spalling. Unlike standard PTFE gaskets, once clamped (30 in./lb), Food-Flex™eliminates leaks in ΔT situations and out performs all standard elastomeric gaskets by providing 2-6x extended service life.

Tuf-Steel® is composed of a unique 50/50 blend of non-pigmented PTFE and 316L passivated and atomized stainless steel. Testing and seven years of documented application usage has demonstrated that Tuf-Steel® is the choice for perfect surface performance, outstanding durability and extended service life in both SIP (steam in place) and WFI (water for injection) applications. Tuf-Steel® is ideal for sanitary steam pipe connections in extreme temperatures ranging from -100°F to 500°F. The superior strength of Tuf-Steel® eliminates creep and cold flow providing a leak-free seal and preventing maintenance problems and system downtime.

PTFE is the material of choice whenever low temperature flexibility or gasket memory is not required and can remain in service for longer periods of time in both water and steam applications. PTFE is not recommended with large temperature variations due to creep and cold flow. PTFE has minimal extractables, has a low absorption rate and excellent resistance to process fluids.

Platinum Cured Silicone is the material of choice in sanitary water systems when PTFE is not feasible due to severely misaligned fittings, or if the cost of high pressure clamps does not outweigh the benefits of PTFE (extended service life). See literature RF-170 for more information.

FKM Fluoroelastomer and EPDM compounds are specified by many of our process equipment manufacturers. They are generally suitable for these applications, however, service life must be considered and a preventative maintenance program be implemented to mitigate degradation.

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Special fittings for validations

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