Extending the use of our patent pending molding technology, the 3504 TUFF-RAIL® gasket is the latest addition to our TUFF-RAIL® family of products. A blend of aluminosilicate and PTFE, the 3504 TUFF-RAIL® offers excellent compressibility and a wide range of chemical compatability. Engineered with the same raised sealing areas, the 3504 TUFF-RAIL® has been proven to seal and reseal even in the most demanding manway installations. 


  • Engineered to a single size to fit the most common manways simplifying inventory (AAR-1, UTC-1, TRN-1)
  • Reusable with unlimited shelf life and high crush resistance - issues commonly associated with rubber gaskets 
  • Raised sealing ribs offer excellent creep resistance and long term bolt load retention - ideal for heavy vibration and thermal cycling. 


  • PTFE with aluminosilicate microspheres 
  • Min. Temperature:        -450°F     /        -268°C
  • Max. Temperature:     500°F        /     260°C
  • Creep Relaxation (ASTM F38) %:    40
  • Compressibility (ASTM F36) %:        24-45
  • Recovery (ASTM F36) %:        >30
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