SEALING
ePTFE tap is an adaptable , robust material which offers versatility and effectiveness in a range of sealing applications .
By Angelica Pajkovic , Florian Werner , Julia Köder , and Josmar
Cristello – Teadit
About the author Angelica Pajkovic is a Client Specialist at Teadit , with a particular focus on technical content development . Hailing from Toronto , Canada , she has over six years of experience in the industrial industry . In her previous role as Editorin-Chief at an industrial B2B publishing company , she gained a rounded understanding of the challenges , interests , and business relationships in the industrial sector . For more information , please contact Angelica via email at : angelicap @ teadit . com .
Expanded PTFE Gasket-Tape for effective sealing solutions
Expanded polytetrafluoroethylene ( ePTFE ) tape is a robust and adaptable sealing material . The choice between mono-axial and multi-directional ePTFE tape is a crucial decision that can significantly influence sealing performance . Each type has distinct advantages that cater to specific application needs , making a well-informed selection essential . Understanding these differences is key , as the correct choice can enhance sealing , minimise maintenance costs and prolong the service life of equipment — factors that are integral to maintaining process safety and reliability .
What are ePTFE tapes
While several industries utilise ePTFE tapes , the benefits of this sealing technology are often overlooked . Although one-piece cut gaskets are an ideal choice in many instances , there are several scenarios where ePTFE tape is the chosen sealing method . Made from 100 % virgin PTFE that has been expanded or stretched in either one or two directions , ePTFE gasket-tapes exhibit outstanding chemical resistance , making them suitable for use with various aggressive chemicals and corrosive substances . Their low friction coefficient reduces wear and allows components to move freely , which is crucial for applications with dynamic parts . Additionally , ePTFE gasket-tapes are non-reactive and inert , ensuring compatibility with sensitive environments such as food processing or pharmaceuticals where contamination must be avoided . These tapes , which typically come with a pressure-sensitive adhesive strip on one side , are available in various sizes and spool lengths . They have the ability to conform to irregular surfaces , seal narrow or uneven spaces , and be easily used
Figure 1 : 10x3 ePTFE tape compressed with 30N / mm 2 . in flanges in dynamic systems where there ’ s movement , such as a shaft or stem passing through the flange . One of their key advantages is that they can be applied without needing to remove components like shafts or stems . Their flexibility allows them to be wrapped around these elements , ensuring a reliable seal without the need for complete disassembly , making it especially convenient for equipment where a shaft passes through the flange . Given their versatility and effectiveness in various applications , it is essential to consider the different types of ePTFE gasket-tapes available , as well as the unique value that each provides .
Types of tapes
Expanded PTFE gasket-tapes are available in two main styles : mono-axial and multi-directional . Each form has a distinct advantages that makes it suitable for different applications .
Mono-axial ePTFE tape Mono-axial ePTFE tape , such as Teadit ’ s 24B Tape , is extremely conformable , making it very easy to install in any flange , including those with complex geometries . Often referred to as joint sealant , its flexibility allows it to be shaped and applied with minimal effort , ensuring a reliable seal in various configurations . As mono-axial ePTFE tape is expanded in only one direction , it naturally spreads laterally ( increases in width ) when compressed , typically expanding to 200-300 % of its original width . This characteristic should be factored into sizing and installation to ensure a proper fit , as shown in Figure 1 . Mono-axial ePTFE gasket tape remains an ideal solution for applications where ease of installation and adaptability are crucial .
42 Valve World February 2025 www . valve-world . net