Ductile Iron (Nodular Iron)

Strong and Break Resistant

Ductile Iron piston rings and seals can withstand a lot of bending and are very resistant to breaking. Ductile Iron piston rings and seals are roughly twice as strong as Gray Cast Iron piston rings & seals.


  • Can Withstand Heavy Pounding
  • High Bending Strength
  • Very Resistant to Breaking
  • Able to Withstand High RPMs
  • Able to Withstand High Stress
  • Roughly 2x Stronger than Gray Cast Iron


  • Microstructure contains rounded (or nodular) shaped grains.
  • Does not have the microstructure matrix of Grover’s piston ring iron GC-211 and will induce higher wear on the bore.


Ductile Iron Grades that Meet ASTM A 536:

  • 60-40-18
  • 65-45-12
  • 80-55-06
  • 100-70-03
  • 120-90-02

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