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Many branded compounds of PTFE continue to exist

Discussion in 'General Discussion' started by lian ptfesheet, May 8, 2017.

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  1. lian ptfesheet

    lian ptfesheet New Member

    Laintuo Expanded PTFE Joint Sealant is generally used in compounds destined for chemical and mechanical service. Graphite reduces initial wear and provides general strengthening characteristics to the composition. Also, graphite compounds generally display high load carrying capabilities in high-speed rubbing contact applications and exhibits the highest hardness of any of the compounds.

    Of all the compounds, we have found Carbon-Graphite to wear out tools the fastest. The same tool that might give 200-300 components if done in virgin PTFE, will only give 15-20 components in Carbon-Graphite.

    Bronze is usually mixed in a 40% or 60% ratio. Bronze compounds have higher hardness, lower wear, higher comprehensive strength, better dimensional stability, higher thermal conductivity, lower creep and cold flow than most other compounds.

    However, test data shows that bronze compounds are not suited to many electrical applications or to those that involve corrosive service environments.

    MoS2 adds substantially to the hardness, stiffness and wear resistance of PTFE resins. It reduces starting friction and has little effect on PTFE 's electrical and chemical properties. Generally, only small amounts of molybdenum disulfide are used, most often in conjunction with complementary fillers (usually bronze or glass).

    In addition to the above fillers, we have used fillers of ceramic, stainless steel and ekonol. Many branded compounds of PTFE continue to exist (eg: Rulon, Turcite etc) – but a comparison of properties shows that there is little difference between the branded compounds and one of the regular grades.

    Ultimately, choosing a compounded grade is a question of application – asking which property needs to be enhanced and which can be foregone (or compromised on). In most mechanical applications, it becomes a trade-off between higher mechanical properties (hardness, wear resistance, creep) and lower coefficient of friction.

    It should be noted than very rarely does cost play a huge decider in choosing a compounded grade. While historically, bronze has been most expensive, followed by glass and then carbon-graphite (virgin PTFE has usually been priced around the same level as carbon-graphite) – their properties are so different that the end user rarely sees them as substitutes. PTFE Rod: http://www.liantuoptfe.com/product/
     

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