Header rings in Well Service Pump Packing act as primary barriers, molded from high-durometer HNBR (90 Shore A) to resist extrusion and abrasion. Positioned at the fluid end, they absorb initial pressure spikes in frac iron. Aramid fabric reinforcement prevents tearing under 18,000 PSI pulses. Tapered lips reduce plunger scoring. In cement pumps, header rings handle silica-laden slurr... https://globalsealstech.com/product-category/oil-gas-seals/high-pressure-water-pump-seals/