Packing material selection depends on pumped fluid characteristics, operating pressure, plunger speed, and expected service life. Materials range from elastomeric compounds for lower-pressure applications through reinforced composites for moderate service to advanced PTFE-based materials for extreme pressure and abrasive conditions encountered in modern high-rate fracturing operations. https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/