Full definition
Braided packing rings made from aramid fiber (Kevlar® or Twaron®) impregnated with PTFE or graphite lubricant. Excellent mechanical wear resistance—3-5× greater than PTFE—and rated for shaft speeds up to 20 m/s. For slurry pumps, paper pulp, and abrasive suspension service. Temperature to 280 °C. pH 2-12. Reference standard: ASTM F104 for compressed packing materials.