| Barrel Face |
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Iron or steel; increased sealing; most common top ring profile, can be coated with Moly, chrome Manganese Phosphate, or Ceramic PVD |
| Torsional |
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Increased side sealing; cast iron or steel; Moly or chrome coating. |
| Full/Half Keystone |
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Primarily for diesel applications; prevents carbon build up and ring sticking, usually chrome plated for longer life |
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Cast Iron
Economical, excellent thermal conductivity, self-lubricating graphite flakes; good for less demanding applications
Premium Ductile Iron
Stronger and more ductile than cast iron; withstands higher temperatures in high-performance applications
Steel
For the most demanding, or high temperature, high-stress, high-performance applications; allows for thinner and lighter ring designs that seal better at high rpms
Stainless Steel
For super-high horsepower engines using any fuel; satisfies extremely high stress and performance requirements, can be Gas-Nitrided and Ceramic PVD coated; allows for thinner and lighter ring designs that seal better at high rpms
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