PTFE vs. PFA Lining: Explore the Differences

PTFE vs. PFA Lining: Explore the Differences

Polytetrafluoroethylene (PTFE) and perfluoroalkoxy (PFA) are two of the most popular chemical-resistant materials for piping and tank lining applications and are frequently selected for comparison. Both materials are highly resistant to chemicals, high temperatures and wear and are, therefore, appropriate to be used for several industrial purposes. However, what is the performance difference between PTFE and PFA, what is the cost difference, and what applications are there? Now let’s explore the most important differences between these types of materials in order to guide your selection.

What is PTFE?

Polytetrafluoroethylene (PTFE) is a high-performance fluoropolymer that can withstand the highest temperature, chemical and electrical conductivity resistances. PTFE is employed as lining in tanks, pipes, gaskets, seals and so on, as industrial products exposed to corrosive agents.

What is PFA Lining?

PFA (Perfluoroalkoxy) is a class of fluoropolymer which has some of the properties of PTFE but with different characteristics that allow its own applications. PFA is most commonly used in piping, tanks, and fittings, where it provides both the highest level of chemical resistance and the highest level of heat performance. Additionally, PFA is widely applied in PFA Lined Pipe for enhanced durability and resistance in demanding industrial environments.

Key Differences Between PTFE and PFA Lining

Chemical Resistance:

PTFE: Both materials are chemically inert, but PTFE is more resistant to a broad range of chemicals.

PFA: PFA is, aside from being well chemical resistant, also more appropriate for applications with high mechanical stress and for easier installation.

Flexibility

PTFE: PTFE is stiffer and more difficult to mould, thus it has a higher processing temperature.

PFA: PFA is more flexible, and therefore easier to manipulate and install, especially for complex applications.

Temperature Resistance:

PTFE: PTFE can withstand high temperatures up to 260°C, making it ideal for most applications requiring heat resistance.

PFA: PFA also performs similarly at high temperatures but maintains its physical integrity under higher mechanical stress.

Ease of Fabrication: 

PTFE: The fabrication of PTFE is more complicated owing to its high rigidity and needs specific processing methods.

PFA: Since PFAs are more deformable materials, it is simpler to process and fabricate in various shapes because of the advantages of using more deformable materials, Table 2, which lowers fabrication cost and time.

Cost

PTFE: In general, PTFE is less costly and therefore it is the more often chosen material than for most standard applications.

PFA: PFA is often high-cost because of its high properties, its flexibility, and its ability to be used in high-performance environments.

Durability:

PTFE: PTFE is known for its durability but can be more prone to damage from mechanical stress or impact.

PFA: PFA provides comparable durability but has improved mechanical flexibility performance, such as for application in complex piping systems, etc.

Conclusion

In conclusion, PTFE and PFA linings provide a high chemical and temperature resistance, and, therefore, are indispensable in chemical industries such as chemical processing, pharmaceutical, and food production. The choice between PTFE and PFA depends on specific needs. The suitability of PTFE is in applications where chemical resistance is a major factor and the material is not subject to mechanical stress whereas the susceptibility of PFA to mechanical stress, higher temperatures and better fabrication, flexibility is ideal to address. By knowing the specific advantage of each material, of course, you can choose one for your industrial use.

PTFE vs. PFA Lining: Explore the Differences

by Galaxy Thermoplast Pvt. Ltd. time to read: 2 min
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