Considering applications and cost, the choice between PFA and FEP ultimately depends on specific requirements. FEP is more cost-effective and has good overall properties, making it suitable for many industrial applications. On the other hand, PFA offers superior temperature resistance, chemical resistance, and mechanical properties, making it the preferred choice for demanding applications despite being more expensive. Hence, selecting the most suitable material requires weighing the cost against the specific application requirements, paying specific attention to factors such as cost, temperature resistance, and chemical resistance.